JP2005148874A - Connection type measurement device, measurement unit, and master unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection type measurement device starting power supply to respective measurement units based on a connection condition of a measurement unit allowing stacking connection. <P>SOLUTION: This connection type measurement device is constructed of a master unit 1M and one or more measurement units 1K connected to the master unit 1M via freely removable stacking connection. The measurement unit 1K is provided with a driving power source line LS1 and a detection power source line LS2 connected mutually between the adjacent units, a main circuit block 30 driven via the driving power source line, and a connection notification circuit 31 driven via the detection power source line LS2 for outputting connection notification signals CN1 and CN2 to a prestage unit. The master unit 1M is provided with a power source supply circuit 21 supplying power source to the driving power source line LS1 and a power source control circuit 22 controlling the power source supply circuit 21 based on the connection notification signals from the adjacent units. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a coupled measurement device, a measurement unit, and a master unit, and more specifically, a coupled measurement device in which one or more measurement units are detachably coupled to a master unit connected to a terminal device. Regarding improvements.

2. Description of the Related Art Conventionally, a connection type system that can change a device configuration in a scalable manner by stacking and connecting a plurality of units is known. For example, the data collection device described in Patent Document 1 is configured by sequentially connecting standardized modules such as an I / O module and a servo loop module between a power supply module and a controller module. Power supply to each standardization module is performed from the power supply module, and data collection from each standardization module is performed by the controller module.
Japanese translation of PCT publication No. 2003-507816 (FIG. 4)

  In such a connected system, the power consumption of the entire system varies greatly depending on the number of connected units. In addition, since the power consumption of each unit varies depending on the type, the power consumption of the entire system to which a plurality of types of units can be connected varies not only depending on the number of units to be linked but also the combination thereof.

  Therefore, the conventional connected system needs to have a power supply device that can supply the assumed maximum power consumption, and even when only a single unit is connected in actual use, the maximum power consumption An excessively large power supply unit was used. That is, the conventional connected system has a problem that the apparatus size is scalable, but the power supply apparatus is not scalable.

  Further, in the case of a system in which the units are sequentially stacked and connected, there is no physical limitation on the number of units that can be connected, and thus there is a problem that the maximum power consumption cannot be assumed in advance.

  As a method for solving such a problem, for example, it is conceivable to limit the number of connectable units in advance according to the supply capability of the power supply device. In this case, since the number of units is limited regardless of the power consumption of each unit, an excessive limit is imposed as compared with the power supply capability. On the other hand, if the management of the power consumption of the entire system is left to the user, the work of attaching and detaching the unit becomes complicated, and there is a risk that the unit exceeding the rated capacity of the power supply unit will be inadvertently connected and turned on. It was.

  The present invention has been made in view of the above circumstances, and a connected measurement device that starts power supply to each measurement unit based on the connection state of the measurement unit that can be detachably connected to the master unit. The purpose is to provide.

  In particular, it is an object of the present invention to provide a connected measurement device capable of switching the power supply source for the measurement unit according to the number of measurement units connected to the master unit. It is another object of the present invention to provide a connected measurement device that supplies power to a measurement unit according to the attributes of the measurement unit connected to the master unit, in particular, the total power consumption.

  It is another object of the present invention to provide a measurement unit and a master unit that can be applied to the connected measurement device.

  A connected measuring device according to the present invention includes a master unit having a power input unit that receives power supply from an external device, and is detachably connected to the master unit, receives power supply via the power input unit, and performs measurement processing. A connected measurement device comprising a measurement circuit to be performed and one or more measurement units having storage means for storing attribute information of its own unit, the attribute provided in the master unit and stored in the storage means Power supply control means for generating a power supply control signal based on information, and power supply means provided on a circuit connecting the power supply input section and the measurement circuit, and supplying power to the measurement circuit based on the power supply control signal; It is configured with.

  With this configuration, when one or more measurement units are connected to the master unit, the master unit supplies power based on the attribute information of each measurement unit before supplying power to the measurement circuit of each measurement unit. It is possible to start the power supply to the measurement circuit based on the determination result.

  The connected measuring device according to the present invention includes a master unit connected to the terminal device, and one or more measuring units that are detachably connected to the master unit and receive power supply from the master unit. A measuring device having a drive power supply line and a detection power supply line interconnected between the connected units, wherein the measurement unit is driven via the drive power supply line; A connection notification circuit that is driven through the detection power line and outputs a connection notification signal to the master unit or a measurement unit adjacent to the master unit, and the master unit supplies power to the drive power line. And a power supply control circuit that controls the power supply circuit based on a connection notification signal from an adjacent unit. And a circuit.

  With such a configuration, when one or more measurement units are connected to the master unit, a drive power supply line and a detection power supply line that cross each measurement unit and are connected to the master unit are formed. In each measurement unit, detection power is supplied from the master unit via the detection power line, and a connection notification signal is output to an adjacent unit on the master unit side. Based on this connection notification signal, the master unit supplies power to the drive power supply line and supplies power to the main circuit block of the measurement unit. Therefore, the master unit can detect the connection state of the measurement unit before supplying power to the main circuit block of each measurement unit, and can start supplying power to the main circuit block according to the connection state. it can.

  Further, in the connection type measurement device according to the present invention, the connection notification circuit generates a connection notification signal based on the connection notification signal from the subsequent unit, and outputs the connection notification signal to the master unit or a measurement unit adjacent to the master unit. Composed. With such a configuration, the master unit can detect that two or more measurement units are connected based on the connection notification signal.

  Further, the coupled measuring device according to the present invention is configured such that the master unit can be supplied with bus power from the terminal device and can be supplied with external power having a larger power capacity than the bus power. The power supply circuit includes power switching means for switching a supply source to the drive power supply line to a bus power supply or an external power supply, and a power output means for connecting the selected supply source to the drive power supply line, The power supply control circuit is configured to control the power supply output means based on the connection notification signal from the adjacent unit when the bus power supply is selected as the supply source to the drive power supply line. With such a configuration, when only bus power having a small power capacity is supplied, power supply to the drive power supply line can be controlled according to the connection state of the measurement unit. That is, it is possible to operate the connected measuring device with only the bus power supply while preventing the power capacity from being insufficient after supplying the power to the measuring unit.

  Further, in the connection type measuring apparatus according to the present invention, the power supply control circuit determines the number of measurement units connected to the master unit based on the connection notification signal, and controls the power output means based on the determination result. Configured. With such a configuration, it is possible to control power supply to the drive power supply line based on the number of measurement units. Therefore, with a simple configuration, it is possible to prevent a shortage of power capacity after power is supplied to the measurement unit.

  Further, in the connection type measuring apparatus according to the present invention, the connection notification circuit includes a data storage unit that stores power consumption of the main circuit block, and a consumption stored in the data storage unit for a connection notification signal from a subsequent unit. An addition circuit for adding power, and the output of the addition circuit is output as a connection notification signal to the master unit or a measurement unit adjacent to the master unit. With such a configuration, the master unit can determine the total power consumption based on the connection notification signal, and can control the power supply to the drive power supply line according to the determination result.

  Further, in the coupled measuring apparatus according to the present invention, the master unit has means for supplying bus power to the detection power line, and the power supply circuit is based on the start of supply of bus power from the terminal device. The power supply to the drive power line is configured to start. With such a configuration, it is possible to operate the connected measuring device only by supplying bus power.

  Further, in the coupled measuring apparatus according to the present invention, the measuring unit has a data communication line interconnected between adjacent units, and the main circuit block performs data communication with the master unit via the data communication line. A first circuit block including a circuit; a second circuit block capable of controlling power supply independently of the first circuit block; and being driven via a driving power supply line, to the first circuit block and the second circuit block The unit power supply unit is configured to supply power to the second circuit block based on an instruction from the master unit received by the communication circuit.

  With such a configuration, first, power can be supplied to the first circuit block of each measurement unit to start the communication circuit, and power can be supplied to the second circuit block based on an instruction from the master unit. Therefore, each measurement unit can be activated in the low power mode in which communication with the master unit is possible, and then can be shifted to the full power mode in accordance with an instruction from the master unit.

  Further, in the connection type measurement apparatus according to the present invention, the master unit collects attribute information of each measurement unit via the communication means for performing data communication with each measurement unit via the data communication line. And power control means for instructing power supply to the second circuit block based on the collected attribute information. With such a configuration, the master unit can determine whether power supply is possible based on the attribute information of the measurement unit, and can instruct power supply to the second circuit block.

  In the coupled measurement device according to the present invention, the power control unit obtains the total power consumption based on the collected attribute information of the measurement unit, and supplies power to the second circuit block based on the total power consumption. Configured to direct. With such a configuration, it is possible to determine whether power supply is possible based on the total power consumption and to instruct power supply to the second circuit block.

  Further, in the coupled measuring apparatus according to the present invention, the power control unit gives priority to the measuring units with low power consumption based on the collected attribute information of the measuring units, and the second circuit is applied to some measuring units. It is configured to instruct power supply to the block. According to such a configuration, even if all measurement units cannot be activated, some measurement units can be activated.

  The connected measuring device according to the present invention includes a master unit connected to the terminal device, and one or more measuring units that are detachably connected to the master unit and receive power supply from the master unit. A measuring device having a power line and a data communication line interconnected between the connected units, the master unit having a power supply circuit for supplying power to the power line, and the measuring unit A first circuit block including a communication circuit for performing data communication with the master unit via the data communication line, a second circuit block capable of controlling power supply independently of the first circuit block, and a power line. And a unit power supply unit that supplies power to the first circuit block and the second circuit block. Based on an instruction from the master unit communication circuit is received, configured to supply power to the second circuit block.

  With such a configuration, first, power can be supplied to the first circuit block of each measurement unit to start the communication circuit, and power can be supplied to the second circuit block based on an instruction from the master unit. Therefore, each measurement unit can be activated in the low power mode in which communication with the master unit is possible, and then can be shifted to the full power mode in accordance with an instruction from the master unit.

  ADVANTAGE OF THE INVENTION According to this invention, based on the connection state of the measurement unit which can be connected with a master unit, the connection type measuring device which starts the power supply to each measurement unit can be provided. In particular, it is possible to provide a connected measurement device that can switch the power supply source to the measurement unit according to the number of measurement units connected to the master unit. In addition, it is possible to provide a connected measurement device that supplies power to the measurement unit according to the attribute of the measurement unit connected to the master unit, in particular, the total power consumption.

  Moreover, according to this invention, the measurement unit and master unit which can be applied to the said connection type | mold measuring apparatus can be provided.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a state of use of an example of a connection type measuring apparatus according to the present invention. A data totaling terminal 2 and an AC adapter 3 can be connected to the connected measuring device 1 and activated by connecting the data totaling terminal 2.

  The connection type measuring apparatus 1 includes a master unit 1M and one or more measurement units 1K that are detachably stacked to the master unit 1M. Power supply to each measurement unit 1K is performed from the master unit 1M, and measurement data generated in each measurement unit 1K is collected by the master unit 1M.

  The data totaling terminal 2 is a user terminal that is connected to the master unit 1M via the data signal line 4 and performs operation control and data totaling of the coupled measuring apparatus 1, and a general-purpose personal computer is used. The measurement data of each measurement unit 1K collected by the master unit 1M is transmitted to the data totaling terminal 2 via the data signal line 4, and then totaled, analyzed, or recorded. Various settings and operation instructions of each measurement unit 1K are performed by a user operation on the data totaling terminal 2 and transmitted to the master unit 1M via the data signal line 4.

  The master unit 1M is supplied with a DC power generated from a commercial AC power by the AC adapter 3 via an external power cable 5. Power is also supplied from the data totaling terminal 2 via the data signal line 4. Here, as the data signal line 4, a USB cable adopting the USB (Universal Serial Bus) standard for transmitting a data signal superimposed on a bus power source is used. That is, bidirectional serial communication is performed between the data totaling terminal 2 and the master unit 1M, and power is supplied from the data totaling terminal 2 to the master unit 1M.

  The coupled measuring device 1 can be operated only by the bus power from the data signal line 4 without supplying the external power from the AC adapter 3. However, this bus power source is a weak power source with a rated current of about 400 to 500 mA, and usually has a smaller power capacity than an external power source with a rated current of several A or more. For this reason, when the power consumption in the coupled measuring device 1 exceeds the power capacity of the bus power supply, it is necessary to supply an external power supply from the AC adapter 3, and in this case, the bus power supply alone is not activated. Must be.

  That is, when the AC adapter 3 is not connected, the master unit 1M must determine whether or not the measurement unit 1K can be driven by the bus power before supplying power to the measurement unit 1K. In addition, when using a USB bus power supply, it is necessary to notify the supply source (data totaling terminal 2) of the necessary current consumption in advance, and a weaker power supply with a current rating of about 200 mA before this notification. (Standby power) is only supplied. That is, the master unit 1M needs to detect the connection state of the measurement unit 1K using such a weak standby power supply.

  Therefore, in the connected measuring device 1 according to the present embodiment, when the power is turned on without an external power supply, the connected measuring unit 1K is detected by the hardware detection process using the standby power supply, and each measurement is performed. Only when the unit 1K can be driven by the bus power supply, the power supply to each measurement unit 1K is started.

  FIG. 2 is a schematic view showing an example of each unit constituting the coupled measuring device 1 of FIG. 1, and shows a master unit 1M, an analog measurement unit 1h, a strain measurement unit 1s, and a temperature measurement unit 1t. .

  The analog measurement unit 1h is an HA (High-speed Analog) unit that observes the waveform of an analog voltage signal at a high sampling rate of about 1 MHz. For example, the analog measurement unit 1h measures an analog signal output from a laser displacement meter and calculates the amount of displacement. Can be acquired. The strain measurement unit 1s is an SG (Strain Gage) unit that measures the resistance value of the strain sensor and measures the amount of strain. The temperature measurement unit 1t is a TH (THermometer) unit that measures the output voltage of a temperature sensor such as a thermocouple and measures the temperature. These units 1h, 1s, and 1t are all examples of the measurement unit 1K.

  Each measurement unit 1K can be connected to the front stage unit and the back stage unit. The preceding unit is an adjacent unit on the master unit 1M side as viewed from the measuring unit 1K of interest, and is the measuring unit 1K or the master unit 1M. On the other hand, the rear stage unit is an adjacent unit on the opposite side to the master unit 1M, and is always the measurement unit 1K. For example, in the case of the strain measurement unit 1s of FIG. 2, the analog measurement unit 1h is a front-stage unit, and the temperature measurement unit 1t is a rear-stage unit.

  The adjacent units are connected with the front connection surface 10 and the rear connection surface 11 facing each other. At this time, the front connector 12 and the rear connector 13 are connected, and electrical connection between the units is performed. Further, the fitting claw 14 and the fitting hole 14h on the connecting surfaces 10 and 11 are fitted so as not to easily fall off. Further, the drop-off prevention screw 15 disposed so as to obliquely penetrate from the non-connection surface to the front connection surface 10 is engaged with the screw hole 15h on the rear connection surface 11 of the front unit so as to be connected more firmly. be able to. The master unit 1M does not have the front connection surface 10 and does not have the fitting claw 14 and the front connector 12.

  In this way, if a plurality of measurement units 1K are connected to the master unit 1M in a chain, the number of measurement units 1K that can be physically connected is not limited. Such a connection form is called stacking connection. 1 and 2 show an example in which the measurement unit 1K is connected to the master unit 1M in a horizontal direction and in a straight line, in close contact with each other, but the stacking connection is in this form. It is not limited. In addition, if the master unit 1M or the measurement unit 1K can connect two or more subsequent units, a connection form having a branch (for example, Y-shaped, T-shaped, V-shaped) is provided. Is still a stacking connection.

When stacking connection is adopted, there is no limit to the number of units that can be connected, so even if external power is supplied from the AC adapter 3, the power capacity may be insufficient.
For this reason, in the connection type measurement apparatus 1 according to the present embodiment, can each measurement unit 1K be driven by starting each measurement unit 1K in the low power mode and detecting the total power consumption in the full operation mode? Is determined. This detection process is performed by a software detection process of the connected measurement unit 1K. That is, the detection process of the measurement unit 1K is performed in two stages of the hardware detection process and the software detection process.

  FIG. 3 is a block diagram showing an example of the internal configuration of the coupled measuring apparatus 1 of FIG. The data communication line LD, the drive power supply line LS1, and the detection power supply line LS2 pass through each measurement unit 1K, and when adjacent units are connected, they are connected to each other and connected to each other. 1M and each measurement unit 1K.

  The master unit 1M includes a main circuit block 20, a power supply circuit 21, and a power control circuit 22. The power supply circuit 21 is a circuit that supplies either the bus power from the data totaling terminal 2 or the external power from the AC adapter 3 to the drive power line LS1. The power supply control circuit 22 is a control circuit that controls the power supply circuit 21 based on the connection state of the measurement unit 1K. The main circuit block 20 is an electric circuit excluding the power supply circuit 21 and the power supply control circuit 22, and details will be described later.

  The measurement unit 1K includes a main circuit block 30 and a connection notification circuit 31. The connection notification circuit 31 is a circuit that notifies the previous unit of the connection state of the measurement unit 1K. The main circuit block 30 includes an electric circuit excluding the connection notification circuit 31, is driven by the driving power supply line LS1, and can perform data communication with the master unit 1M through the data communication line LD.

  The connection notification circuit 31 is driven by the detection power supply line LS2, and outputs a connect signal CN1 and a multistage connect signal CN2 to the previous unit. The connect signal CN1 is a signal indicating the presence of the own unit, and a voltage level obtained by wire connection with the detection power supply line LS2 is output as the connect signal CN1. The multistage connect signal CN2 is a signal indicating that there is a subsequent unit, and is generated by the OR circuit 32.

  In the OR circuit 32, one input terminal is fixed at L level (for example, ground level), the other input terminal receives the connect signal CN1 from the subsequent unit, and outputs the multistage connect signal CN2. That is, the OR circuit 32 corresponds to a pull-down circuit, and its output is at the H level when the subsequent unit is connected, and at the L level when it is not connected. Since the current consumption in the OR circuit 32 is about several μA, all the connection notification circuits 31 can be driven only by the bus power supply even when a large number of measurement units 1K are connected.

  The power control circuit 22 performs switching control of the power supply circuit 21 based on the supply of external power. In other words, when external power is supplied, the switching control is performed so that the power supply source is the external power supply, and when only the bus power is supplied, the power supply source is the bus power. In the case of only the bus power supply, power supply to the drive power supply line LS1 is started based on the connect signal CN1 and the multistage connect signal CN2 from the latest measurement unit 1K.

  In other words, hardware detection processing is performed by the power supply control circuit 22 of the master unit 1M and the connection notification circuit 31 of each measurement unit 1K. Based on the detection result, the power supply circuit 21 is connected to each measurement unit 1K. Power supply to the main circuit block 30 is started.

  FIG. 4 is a diagram illustrating an example of a combination of the connect signal CN1 and the multistage connect signal CN2 input to the master unit 1M with respect to the number of measurement units. The connection signal CN1 becomes L level only when the measurement unit 1K is not connected to the master unit 1M. For this reason, the presence or absence of the measurement unit 1K can be determined based on the connect signal CN1.

  Further, the connection signal CN1 is at the H level and the multistage connection signal CN2 is at the L level only when one measurement unit 1K is connected to the master unit 1M. For this reason, it is possible to determine that one measurement unit 1K is connected based on the connect signal CN1 and the multistage connect signal CN2.

  In other cases, both the connect signal CN1 and the multistage connect signal CN2 are at the H level. Therefore, it can be determined that there are two or more measurement units 1K connected based on the connection signal CN1 and the multistage connection signal CN2.

  In this way, the power supply control circuit 22 determines the number of measurement units based on the connection signal CN1 and the multistage connection signal CN2, controls the power supply circuit 21 based on the determination result, and supplies power to the drive power supply line LS1. Start feeding. That is, when one measuring unit 1K can be driven by the bus power supply and no external power is supplied, if one measuring unit is stacked and connected, power supply is started. In this case, power is not supplied.

  Here, a pull-down circuit (not shown) is inserted into the input terminal of the power supply control circuit 22 (the input terminal of the connect signal CN1 and the multistage connect signal CN2), and the L level is detected if it is in an open state. It is described as a thing.

  FIG. 5 is a block diagram showing a detailed configuration example of the master unit 1M. The power supply circuit 21 includes switching means SW1 and SW2, and supplies power to the drive power supply line LS1. The switching means SW1 is a three-terminal circuit that switches the power supply source to a bus power source or an external power source. The switching means SW2 is a two-terminal circuit that controls on / off of the power supply output to the drive power supply line LS1. The initial state is the off state, and the on state is turned on when power is supplied thereafter.

  The switching means SW1 and SW2 are controlled by the power supply control circuit 22. When the external power is supplied from the AC adapter 3, the power control circuit 22 switches the switching means SW1 to the external power supply side and turns on the switching means SW2. On the other hand, when the external power supply is not supplied, the switching means SW1 is switched to the bus power supply side, and if there is one measuring unit 1K, the switching means SW2 is turned on. Note that the number of measurement units is determined based on the connect signal CN1 and the multistage connect signal CN2, as described above. The above operation of the switching means SW2 is also shown in FIG.

  Since the main circuit block 20 of the master unit 1M is supplied with power via the drive power line LS1, it is activated after the switching means SW2 is turned on. The main circuit block 20 includes a control unit 200, a USB I / F (Interface) unit 201, a bus communication I / F unit 202, an operation indicator lamp 203, a memory 204, and a unit power supply unit 210.

  The control unit 200 is composed of a microprocessor and controls the operation of the entire main circuit block 20 by software processing. The USB I / F unit 201 is an interface circuit that is connected to the data signal line 4 and performs bidirectional communication with the data totaling terminal 2. The bus communication I / F unit 202 is connected to the data communication line LD and is an interface circuit for performing communication with each measurement unit 1K. As a bus master, the bus communication I / F unit 202 controls access to the data communication line LD by each measurement unit 1K. Is going. The operation indicator lamp 203 is a lighting means for displaying the operation state of the master unit 1M to the user. The memory 204 is a storage unit that stores programs and data used by the control unit 200.

  Transmission data from the data totaling terminal 2 is received by the USB I / F unit 201 and output to the control unit 200. When this data is setting data or an operation instruction for any of the measurement units 1K, the control unit 200 instructs the bus communication I / F unit 202 to transmit to the target measurement unit 1K. On the other hand, when the received data is a data collection instruction, the control unit 200 instructs the bus communication I / F unit 202 to collect data from each measurement unit 1K. In this case, the bus communication I / F unit 202 sequentially receives measurement data from each measurement unit 1K and outputs the measurement data to the control unit 200. The measurement data collected in this way is transmitted from the USB I / F unit 201 to the data totaling terminal 2.

  The unit power supply unit 210 is a digital power supply that supplies power to the main circuit block 20, and power is supplied to the unit power supply unit 210 from the drive power supply line LS1. When power supply to the main circuit block 20 is started, the control unit 200 first performs software detection processing. That is, the bus communication I / F unit 202 is instructed to collect the unit types of each measurement unit 1K, and the bus communication I / F unit 202 sequentially receives the unit types from each measurement unit 1K. The control unit 200 obtains the total power consumption in the coupled measuring apparatus 1 based on the unit types collected in this way.

  If the control unit 200 determines that all the measurement units 1K can be driven based on the total power consumption, the control unit 200 notifies the measurement unit 1K of the cancellation of the low power mode. That is, each measurement unit 1K immediately after power-on operates in a low power mode in which data communication is possible, and after receiving a release notification from the master unit 1M, enters a full power mode and starts normal operation.

  FIG. 6 is a block diagram illustrating a detailed configuration example of the measurement unit 1K. The main circuit block 30 of the measurement unit 1K includes an analog circuit unit 50, a digital circuit unit 51, and a unit power supply unit 52.

  The unit power supply unit 52 includes an analog power supply 520 that supplies power to the analog circuit unit 50 and a digital power supply 521 that supplies power to the digital circuit unit 51, and supplies power to the analog circuit unit 50 and the digital circuit unit 51. Are controlled independently.

  Specifically, the power supply by the analog power supply 520 is started based on an instruction from the digital circuit unit 51 and is started later than the power supply by the digital power supply 521. For this reason, the measurement unit 1 </ b> K after the activation of the digital power supply 521 and before the activation of the analog power supply 520 performs a low-power operation that does not supply power to the analog circuit unit 50. This state is referred to as a low power mode, and the state after power supply to the analog circuit unit 50 is referred to as a full power mode.

  The analog circuit unit 50 is a circuit that performs measurement processing of an analog signal input from the input terminal Ain, and includes an analog input circuit 500, an A / D converter 501, and an insulating device 502. Various measurement objects such as a resistor or an analog signal source, for example, a thermocouple or a strain gauge are connected to the input terminal Ain. The analog input circuit 500 is an input circuit including an amplifier, a filter, and the like, and an analog signal whose amplitude and band are adjusted is input to the A / D converter 501. The signal digitally converted by the A / D converter 501 is output to the digital circuit unit 51 via an insulating device 502 made of a photocoupler or the like. For this reason, the analog circuit unit 50 is electrically separated from the digital circuit unit 51.

  The digital circuit unit 51 is a digital circuit that performs various processes other than the measurement process, in particular, a data communication process with the master unit 1M, and includes a control unit 510, a bus communication I / F unit 511, an operation indicator 512, and a memory 513. Consists of. The control unit 510 is composed of a microprocessor, and controls the operation of the entire digital circuit unit 51 and the unit power supply unit 52 by software processing. The bus communication I / F unit 511 is an interface circuit that is connected to the data communication line LD and communicates with the master unit 1M. As a bus slave, data is received only when a request or permission from the master unit 1M is received. Data can be output to the communication line LD. The operation indicator 512 is a lighting unit for displaying the operation state of the measurement unit 1K to the user. The memory 513 is a storage unit that stores programs and data used by the control unit 510.

  When power supply from the master unit 1M to the unit power supply unit 52 is started via the drive power supply line LS1, first, the digital power supply 521 starts power supply to the digital circuit unit 51, and the digital circuit unit 51 is activated. Is done. When the bus communication I / F unit 511 after activation receives a unit type notification request from the master unit 1M, the bus communication I / F unit 511 transmits unit type data. In addition, when receiving the instruction to cancel the low power mode, control unit 510 outputs an activation instruction for analog power supply 520 to unit power supply unit 52. That is, power supply to the analog circuit unit 50 is started based on an instruction from the master unit 1M in the low power mode.

  Steps S101 to S109 in FIG. 7 are flowcharts showing an operation example when the master unit 1M is activated. This startup process is started by connecting the master unit 1M to the data totaling terminal 2 via the data signal line 4. In the power supply circuit 21 before startup, the switching means SW1 is on the bus power supply side, and the switching means SW2 is off. Accordingly, bus power is supplied to the detection power line LS2, but power is not supplied to the drive power line LS1.

  First, the power supply control circuit 22 determines a power supply source based on the presence or absence of an external power supply, and switches the switching means SW1 (steps S101 and S102). That is, when the AC adapter 3 is connected to the master unit 1M and an external power supply with a large power supply capacity is supplied, the switching means SW1 is switched to the external power supply side so that the external power supply becomes the supply source. In this case, the power supply control circuit 22 turns on the switching means SW2 without performing the hardware detection process (step S103), and starts supplying power to the drive power supply line LS1 (step S105).

  On the other hand, when external power is not supplied, the power supply control circuit 22 performs hardware detection processing for the number of measurement units (step S103). This hardware detection process is performed based on the connect signal CN1 and the multistage connect signal CN2 input from the adjacent measurement units 1K to the master unit 1M. Here, it is determined whether or not the number of measurement units is one.

  If the determined number of measurement units is other than 1, the power supply control circuit 22 does not turn on the switching means SW2, and does not supply power to the drive power supply line LS1 (step S104). On the other hand, when the obtained number of measurement units is 1, the power supply control circuit 22 turns on the switching means SW2 and starts supplying power to the drive power supply line LS1 (step S105). At this time, the main circuit blocks 20 and 30 of each block 1M and 1K are activated, but the main circuit block 30 of each measurement unit 1K is activated in the low power mode.

  Next, software detection processing is performed (step S106). The software detection process is performed when the activated master unit 1M inquires the unit type of each measurement unit 1K via the data communication line LD. That is, the bus communication I / F unit 202 in the master unit 1M outputs a unit type notification request to each measurement unit 1K. This notification request is sequentially output to each measurement unit 1K, and the unit type is sequentially returned from each measurement unit 1K.

  Based on these unit types, the control unit 200 of the master unit 1M obtains the power consumption of the whole connected measuring device 1 and determines whether each measuring unit 1K can be driven in the full power mode (step S107). . The power consumption data for each unit type is stored in advance in the memory 204, and the control unit 200 obtains the total power consumption based on this data.

  For example, when the number of connected measurement units is one and the power consumption is small, the measurement unit can be driven by a bus power supply even if no external power is supplied. However, if the power consumption is large, it may not be possible to drive only with the bus power supply. Further, even when external power is supplied, there are cases where the driving cannot be performed when there are a large number of connected measurement units 1K. For this reason, each measurement unit 1K is activated in the low power mode, and the total power consumption is detected.

  The control unit 200 determines whether or not all the measurement units 1K can be driven based on the total power consumption thus obtained. Specifically, the determination is made in comparison with the power supply capacity of the supply source that supplies power to the drive power supply line LS1. That is, if external power is supplied, the total power consumption is compared with the rated power of the external power supply, and if no external power is supplied, the total power consumption is compared with the rated power of the bus power supply. To do.

  As a result, if all the measurement units 1K can be driven, the master unit 1M transmits an instruction to cancel the low power mode to each measurement unit 1K, and each measurement unit 1K starts operation in the full power mode. (Step S108). This cancellation instruction is generated by the control unit 200 in the master unit 1M, and the bus communication I / F unit 202 notifies each measurement unit 1K via the data communication line LD. In each measurement unit 1K, based on this cancellation notification, the low power mode is canceled and power supply to the analog circuit unit 50 is started.

  On the other hand, when the total power consumption exceeds the rated power of the supply source, the master unit 1M outputs an error signal to the data totaling terminal 2, and the data totaling terminal 2 displays an error (step S109). This error signal is generated by the control unit 200, and the USB I / F unit 201 outputs the error signal to each data totaling terminal 2 via the data signal line 4. In the data totaling terminal 2, based on the error signal, for example, an error dialog notifying that the power capacity is exceeded is displayed on the display. In this case, since the master unit 1M does not transmit an instruction to cancel the low power mode, each measurement unit 1K does not shift to the full power mode.

  Steps S201 to S208 in FIG. 8 are flowcharts illustrating an operation example when the measurement unit 1K is activated. When the bus power is supplied to the detection power line LS2, the measurement unit 1K activates the connection notification circuit 31 and outputs the connect signal CN1 and the multistage connect signal CN2 to the preceding unit (steps S201 and S202).

  Next, when bus power or external power is supplied to the drive power supply line LS1, the digital power supply 521 is activated, power supply to the digital circuit unit 51 is started, and data communication with the master unit 1M becomes possible. (Steps S203 and S204). At this stage, power supply to the analog circuit unit 50 is not started, and the measurement unit 1K operates in the low power mode.

  The activated bus communication I / F unit 511 monitors data transmission from the master unit 1M to the own unit (steps S205 and S207). When the unit type notification request is received, the unit type of the own unit is output to the master unit 1M (steps S205 and S206). The unit type is data indicating an HA unit, an SG unit, a TH unit, and the like.

  Further, when receiving an instruction to cancel the low power mode from the master unit 1M, the power supply to the analog circuit unit 50 is started, and the operation in the full power mode is started (steps S207 and S208). In this way, the operation in the full power mode is started, and the measurement unit 1K can operate all functions including the measurement process.

  According to the present embodiment, the bus power is supplied from the master unit 1M to each measurement unit 1K via the detection power line LS2 crossing each unit, and the connection signal CN1 and the multistage connection are supplied from the measurement unit 1K to the previous unit. Signal CN2 is output. Based on these signals CN1 and CN2, the master unit 1M starts power supply to the drive power supply line LS1 that traverses each unit. That is, the connection state of the measurement unit 1K is detected before power is supplied to the drive power line LS1, and the power supply is not started when the power consumption exceeds the power capacity. Therefore, it is possible to start the connected measuring device 1 according to the power supply capacity and the connection status of the measuring units. When the number of measuring units 1K is small, it is possible to operate the connected measuring device 1 using only the bus power supply. Become.

  Further, after supplying power only to the digital circuit unit 51 including the bus communication I / F unit 201 and starting the measurement unit 1K in the low power mode, based on the cancellation instruction of the low power mode from the master unit 1M. The power supply to the analog circuit unit 50 is also started, and the mode is shifted to the full power mode. That is, it is possible to start and communicate in the low power mode and determine whether or not the transition to the full power mode is possible according to the power source capacity and the attributes of each measurement unit.

  In the present embodiment, in the software detection process, each measurement unit 1K notifies the unit type of its own unit, but the present invention is not limited to such a case. That is, it is only necessary to notify the attribute data that can determine the power consumption of the own unit. For example, the power consumption data itself may be notified, or other data corresponding to the power consumption may be notified.

Embodiment 2. FIG.
In the first embodiment, an example has been described in which the number of connected units is determined when external power is not supplied, and power supply to the drive power supply line LS1 is started if the determination result is one. On the other hand, in the present embodiment, a case will be described in which power supply is not started regardless of the number of measurement units when the power consumption of the connected measurement units 1K is large.

  FIG. 9 is a block diagram showing an example of the internal configuration of the coupled measuring apparatus 1 according to the second embodiment of the present invention. Compared to the case of FIG. 3 (Embodiment 1), the measurement unit 1K is different in that it includes a connection notification circuit 31a instead of the connection notification circuit 31.

  When the power consumption of the measurement unit 1K is large, there is a case where the measurement unit connected to the master unit 1M by stacking may not be driven only by the bus power source even if only the unit concerned. Such a measurement unit 1K is provided with a connection notification circuit 31a instead of the connection notification circuit 31.

  In the same way as the connect signal CN, the connection notification circuit 31a is also wire-connected to the detection power line LS2 and the voltage level is output as the multi-stage connect signal CN2. Therefore, regardless of the presence or absence of the rear stage unit, the H level is always notified to the front stage unit as the multistage connect signal CN2.

  The master unit 1M has the same configuration as that of the first embodiment, and when a measuring unit 1K with high power consumption is connected, even if only one measuring unit 1K is connected, two or more master units 1M are used. It is determined that the measurement unit 1K is connected. Therefore, unless external power is supplied, power supply to the drive power supply line LS1 is not started.

  The master unit 1M can connect any of the measurement units 1K shown in FIG. 3 and FIG. 9, and can also stack them together. In such a case, when the measurement unit 1K of FIG. 9 is connected, it can be determined in the hardware detection process that it cannot be driven only by the bus power supply without performing the software detection process.

Embodiment 3 FIG.
In the first embodiment, an example in which one multistage connect signal CN2 is used has been described. On the other hand, in the present embodiment, a case where two multistage connect signals CN2 and CN3 are used will be described.

  FIG. 10 is a block diagram showing another configuration example inside the connection type measuring apparatus 1 of FIG. 1, and shows an example in which two multistage connect signals CN2 and CN3 are used. Each measurement unit 1K is provided with a connection notification circuit 31b including two OR circuits 32 and 33. The OR circuit 32 is exactly the same as in FIG. The logical sum circuit 33 receives the multi-stage connect signal CN2 of the subsequent stage unit and outputs the multi-stage connect signal CN3 to the previous stage unit.

  In this case, the multistage connect signals CN2 and CN3 are input to the master unit 1M from the latest measurement units 1K. Since the multistage connect signal CN3 corresponds to the multistage connect signal CN2 output from the second-stage measurement unit 1K, the master unit 1M determines whether there are two measurement units 1K or more than three. It becomes possible.

  FIG. 11 is a diagram illustrating an example of a combination of the connect signal CN1 and the multistage connect signals CN2 and CN3 input to the master unit 1M with respect to the number of measurement units in the coupled measurement device 1 of FIG. The master unit 1M can determine that one measurement unit 1K is connected based on the connect signal CN1 and the multistage connect signal CN2. Further, it is possible to determine that there are two measurement units 1K connected based on the multistage connection signals CN2 and CN3.

  According to the present embodiment, two measurement units 1K can be driven by a bus power supply, and when no external power is supplied, one or two measurement units that are stacked and connected can be used. For example, the master unit 1M can start the power supply to the drive power line LS1, and can be operated so as not to supply power in other cases.

  If the number of multi-stage connect signals is increased to 3 or more, it becomes possible to discriminate more measurement units in the same manner. Therefore, the present invention can also be applied to a case where more measurement units 1K can be driven by only the bus power supply.

Embodiment 4 FIG.
In the first to third embodiments, the case where the number of units connected in stacking is determined in the hardware detection process using the bus power supply has been described. On the other hand, in the present embodiment, a case will be described in which the total power consumption of the connected measurement units 1K is determined in the hardware detection process.

  FIG. 12 is a block diagram showing another configuration example inside the connection type measuring apparatus 1 of FIG. Compared to the case of FIG. 3 (Embodiment 1), the measurement unit 1K is different in that it includes a connection notification circuit 31c instead of the connection notification circuit 31. Each measurement unit 1K outputs a connect signal CNv to the preceding unit. The connection signal CNv is a multi-value signal (for example, 8-bit data) indicating the total power consumption in all measurement units after the own unit, and is generated by the connection notification circuit 31c.

  The connection notification circuit 31c includes a data storage unit 34, an addition circuit 35, and a buffer circuit 36. The data storage unit 34 is storage means for storing power consumption data in the main circuit block 30 of the unit itself, particularly power consumption data in the full power mode, and holds different data for each unit type. The data storage unit 34 may be a semiconductor memory such as a ROM, but each bit line may be simply connected to the VCC or GND of the detection power supply line LS2.

  The adder circuit 35 is calculation means for obtaining the sum of the connect signal CNv from the subsequent unit and the power consumption data in the data storage unit 34. The output of the adder circuit is output as a connect signal to the preceding unit via the buffer 36. That is, the power consumption in the own unit is added to the connection signal CNv from the subsequent stage, and the connection signal CNv is notified to the preceding unit.

  When only the bus power is supplied, the power control circuit 22 of the master unit 1M starts power supply to the drive power supply line LS1 based on the connect signal CNv from the latest measurement unit 1K. That is, the total power consumption is determined by the hardware detection process, and the power supply circuit 21 starts power supply to the main circuit block 30 of each measurement unit 1K based on the total power consumption. In this case, since the total power consumption is known, the software detection process may not be performed.

  Steps S301 to S310 in FIG. 13 are flowcharts showing an operation example at the time of activation of the master unit 1M according to the fourth embodiment of the present invention. Compared to the case of FIG. 7 (Embodiment 1), only steps S304 and S305 are different.

  If no external power is supplied, a hardware detection process is first performed (step S103). In this hardware detection process, the power supply control circuit 22 acquires the total power consumption in the full power mode. As a result, when all the measurement units can be operated in the full power mode using only the bus power supply, the switching means SW2 is turned on and the power supply to the drive power supply line LS1 is started (step S308). ). The control unit 200 of the master unit 1M activated in this way omits the software detection process and notifies each measurement unit 1K to cancel the low power mode. That is, the software detection process is not performed when no external power is supplied.

  However, even when no external power is supplied, the control unit 200 at the time of activation may be caused to perform software detection processing. For example, since the connection notification circuit 31c is driven by a standby power supply (bus power supply), the number of bits of the connect signal CNv is preferably small. For this reason, the data accuracy of the data storage unit 34 cannot be increased, and it is desirable to perform software processing in order to obtain accurate power consumption. The operation in this case is the same as in FIG. 7 (Embodiment 1).

Embodiment 5 FIG.
In the first embodiment, in the software detection process, an example has been described in which all the measurement units 1K are not shifted to the full power mode when the total power consumption exceeds the rated power of the supply source. On the other hand, in the present embodiment, a case where a part of the measurement units 1K is shifted to the full power mode will be described.

  Steps S401 to S411 in FIG. 14 are flowcharts showing an operation example at the time of activation of the master unit 1M according to the fifth embodiment of the present invention. Compared to the case of FIG. 7 (Embodiment 1), only steps S409 to S411 are different.

  In step S407, when the total power consumption obtained from the unit type of each measurement unit 1K exceeds the rated power of the supply source, the control unit 200 of the master unit 1M performs some measurement to operate in the full power mode. Unit 1K is selected (step S409).

  In this case, the bus communication I / F unit 202 transmits an instruction to cancel the low power mode only to the measurement unit 1K selected by the control unit 200 (step S410). For this reason, only the selected measurement unit 1K shifts to the full power mode, and the measurement units 1K that are not selected maintain the low power mode.

  In addition, the USB I / F unit 201 outputs an error signal to the data totaling terminal 2, and the data totaling terminal 2 displays an error (step S411). This error display is an error display indicating that only some of the measurement units 1K have been activated, and the activated measurement units 1K or the measurement units 1K that have not been activated are also displayed.

  As a method for the control unit 200 to select a part of the measurement units 1K, for example, measurement units with low power consumption may be selected in order within a range not exceeding the rated power. In this case, the largest number of measurement units 1K can be activated in the full power mode. Moreover, you may select based on the position where the measurement unit 1K was connected as another selection method. For example, the measurement unit 1K close to the master unit 1M may be selected sequentially with priority. In this case, it is possible for the user to specify in advance the priority order when selecting some of the measurement units 1K.

  In this embodiment, the example in which the master unit 1M automatically selects a part of the measurement units 1K to be activated in the full power mode has been described. However, the data aggregation terminal 2 is configured to be selected by the user. May be.

Embodiment 6 FIG.
In the present embodiment, a correction method for the temperature measurement unit 1t used by being connected to the connection type measurement apparatus 1 will be described.

  FIG. 15 is a schematic view showing a state of using the temperature measurement unit 1t, as viewed from the rear connection surface 11 side. In this temperature measurement unit 1t, a thermocouple 61 is connected to a terminal block 60 on the back, and temperature measurement is performed based on the output signal. The output signal of the thermocouple 61 is a voltage signal corresponding to the temperature difference between the temperature measuring contact 61s to which the dissimilar metal is bonded and the terminal 61t to which the thermocouple 61 is connected. For this reason, in order to obtain the temperature of the temperature measuring contact 61s, a temperature compensating element 62 such as a temperature measuring resistor is disposed in the vicinity of the terminal 61t to which the thermocouple 61 is connected, and the output signal from the thermocouple 61 is converted into the temperature. It is necessary to compensate based on the output signal of the compensation element 62.

  In this case, if there is a temperature difference Δt between the temperature compensation element 62 and the connection terminal 61t of the thermocouple 61, a measurement error appears. For this reason, in order to measure an accurate temperature, it is necessary to further correct the influence of this temperature difference Δt. If the temperature difference Δt is constant, correction data is obtained in advance, and a correct temperature can be measured by performing correction processing using the correction data. For example, in the case of a temperature measuring device used alone, such a method can be applied.

  However, in the case of the temperature measurement unit 1t incorporated in the connection type measuring apparatus 1, it is necessary to perform correction in consideration of the influence of the adjacent units 1K and 1M, and the correction data differs depending on the connection form. For this reason, in the coupled measuring apparatus 1 according to the present embodiment, the master unit 1M determines the correction data of the temperature measurement unit 1t and notifies the temperature measurement unit 1t.

  The master unit 1M can perform data communication with each measurement unit 1K via the data communication line LD, and the control unit 200 grasps the unit type and the connection position of each measurement unit 1K stacked and connected. can do. For this reason, the control part 200 calculates | requires the correction data of the temperature measurement unit 1t based on these data, and transmits to the temperature measurement unit 1t via the data communication line LD. The temperature measurement unit 1t performs accurate temperature measurement by performing correction processing based on the correction data received from the master unit 1M.

  The correction data is determined based on the influence data from the own unit and the influence data from the adjacent unit. At that time, it is more desirable to consider the heat radiation efficiency. For example, based on the following first to third basic data, the control unit 200 can perform calculation processing to obtain correction data.

  First, the influence of the own unit (temperature measurement unit 1t) on the temperature difference Δt, for example, the influence of the heat generation amount or the back surface shape on the temperature difference Δt is obtained as the first basic data. The first basic data is obtained in advance and held in the memory 204.

  In addition, the influence of the units 1K and 1M arranged adjacent to the temperature measuring unit 1t on the temperature difference Δt, for example, the amount of heat generated in the adjacent units 1K and 1M and the shape of the back surface thereof, is the temperature measuring unit 1t. Of the temperature difference Δt is obtained as second basic data. The third basic data is obtained in advance for each unit type and is held in the memory 204.

  Further, the difference in the influence of the first and second influence data on the temperature difference Δt due to the difference in heat dissipation efficiency, for example, whether or not the temperature measurement unit 1t or the adjacent unit is arranged at the connection end. Differences in the heat dissipation efficiency of each unit and differences in the heat dissipation efficiency of the temperature measurement unit 1t depending on the back surface shape (existence and length of the overhanging portion) of the adjacent units 1K and 1M are obtained as third basic data. Third basic data is also stored in the memory 204 in advance.

  As another method for the control unit 200 to obtain correction data, correction data for the temperature measurement unit 1t may be obtained in advance and stored in the memory 204 for every combination when the measurement unit 1K is connected. If the influence of units other than adjacent units can be ignored, correction data for all combinations when three or less units are connected may be obtained and stored in the memory 204.

It is the figure which showed the mode at the time of the use about an example of the connection type measuring device by this invention. It is the schematic which showed an example of each unit which comprises the connection type measuring device 1 of FIG. It is the block diagram which showed an example of the internal structure of the connection type measuring device 1 of FIG. It is the figure which showed an example of the combination of the connection signal CN1 and the multistage connection signal CN2 which are input into the master unit 1M with respect to the number of measurement units. It is the block diagram which showed the detailed structural example of 1 M of master units. It is the block diagram which showed the detailed structural example of the measurement unit 1K. It is the flowchart which showed the operation example at the time of starting of the master unit 1M. It is the flowchart which showed the operation example at the time of starting of the measurement unit 1K. It is the block diagram which showed an example of the internal structure of the connection type measuring device 1 by Embodiment 2 of this invention. It is the block diagram which showed the other structural example inside the connection type measuring device 1 of FIG. 1 (Embodiment 2). FIG. 11 is a diagram illustrating an example of a combination of a connect signal CN1 and multi-stage connect signals CN2 and CN3 input to a master unit 1M with respect to the number of measurement units in the coupled measurement device 1 of FIG. It is the block diagram which showed the other structural example inside the connection type measuring device 1 of FIG. It is the flowchart which showed the operation example at the time of starting of the master unit 1M by Embodiment 4 of this invention. 14 is a flowchart showing an operation example when the master unit 1M according to the fifth embodiment is started. It is the schematic which showed the mode at the time of use of the temperature measurement unit 1t, and is the figure seen from the back | latter stage connection surface 11 side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connection type measuring device 1M Master unit 1K Measurement unit 2 Data totaling terminal 3 AC adapter 4 Data signal line 10, 11 Connection surface 12, 13 Connector 20 Main circuit block (master unit)
200 Control Unit 202 Bus Communication I / F Unit 210 Unit Power Supply Unit 21 Power Supply Circuit 22 Power Supply Control Circuit 30 Main Circuit Block (Measurement Unit)
31 Connection Notification Circuit 50 Analog Circuit Unit 51 Digital Circuit Unit 510 Control Unit 511 Bus Communication I / F Unit 52 Unit Power Supply Unit 520 Analog Power Supply 521 Digital Power Supply CN1 Connect Signal CN2, CN3 Multistage Connect Signal LD Data Communication Line LS1 Drive Power Supply Line LS2 detection power line SW1, SW2 switching means

Claims (16)

A master unit having a power input unit that receives power supply from an external device, and a measuring circuit and a self unit that are detachably connected to the master unit, receive power supply via the power input unit, and perform measurement processing 1 or 2 or more measurement units having storage means for storing the attribute information,
A power control unit that is provided in the master unit and generates a power control signal based on attribute information stored in the storage unit;
A coupled measuring device provided on a circuit connecting the power input unit and the measuring circuit, and comprising power supply means for supplying power to the measuring circuit based on the power control signal. A connected measuring device comprising a master unit connected to a terminal device and one or more measuring units that are detachably connected to the master unit and receive power supply from the master unit,
A driving power line and a detection power line interconnected between the connected units;
The measurement unit is driven via the drive power supply line and the main circuit block is driven via the detection power supply line, and the connection notification signal is output to the master unit or the measurement unit adjacent to the master unit side. And a notification circuit,
The master unit includes a power supply circuit that supplies power to the drive power supply line, and a power supply control circuit that controls the power supply circuit based on a connection notification signal from an adjacent unit. Mold measuring device.   The connection type circuit according to claim 2, wherein the connection notification circuit generates a connection notification signal based on a connection notification signal from a subsequent unit, and outputs the connection notification signal to a master unit or a measurement unit adjacent to the master unit side. Measuring device. The master unit is supplied with bus power from the terminal device and can supply external power having a larger power capacity than the bus power.
The power supply circuit comprises a power supply switching means for switching the supply source to the drive power supply line to a bus power supply or an external power supply, and a power supply output means for connecting the selected supply source to the drive power supply line,
The power supply control circuit controls the power supply output means based on a connection notification signal from an adjacent unit when a bus power supply is selected as a supply source to the drive power supply line. The connected measuring device described.   5. The connection according to claim 4, wherein the power control circuit determines the number of measurement units connected to the master unit based on the connection notification signal and controls the power output means based on the determination result. Mold measuring device.   The connection notification circuit includes a data storage unit for storing the power consumption of the main circuit block, and an addition circuit for adding the power consumption held by the data storage unit to the connection notification signal from the subsequent unit. The connection type measurement apparatus according to claim 4, wherein the output of the circuit is output as a connection notification signal to a master unit or a measurement unit adjacent to the master unit side. The master unit has means for supplying bus power to the detection power line,
The connected measuring apparatus according to claim 4, wherein the power supply circuit starts power supply to the drive power supply line based on the start of supply of bus power from the terminal device. The measurement unit has a data communication line interconnected between adjacent units,
The main circuit block includes a first circuit block including a communication circuit that performs data communication with the master unit via a data communication line, a second circuit block capable of controlling power supply independently of the first circuit block, and driving And a unit power supply unit that is driven through the power supply line and supplies power to the first circuit block and the second circuit block.
3. The coupled measuring device according to claim 2, wherein the unit power supply unit supplies power to the second circuit block based on an instruction from the master unit received by the communication circuit. The master unit includes communication means for performing data communication with each measurement unit via a data communication line;
The power control means for collecting attribute information of each measurement unit via the communication means and instructing power supply to the second circuit block based on the collected attribute information. The connected measuring device according to 8.   The power control means obtains the total power consumption based on the collected attribute information of the measurement unit, and instructs the power supply to the second circuit block based on the total power consumption. The connected measuring device according to 1.   The power control means gives priority to a measurement unit with low power consumption based on the collected attribute information of the measurement unit, and instructs some of the measurement units to supply power to the second circuit block. The connected measuring device according to claim 10. A connected measuring device comprising a master unit connected to a terminal device and one or more measuring units that are detachably connected to the master unit and receive power supply from the master unit,
A power line and a data communication line interconnected between the connected units;
The master unit has a power supply circuit for supplying power to the power supply line,
A first circuit block including a communication circuit in which the measurement unit performs data communication with the master unit via a data communication line; a second circuit block capable of controlling power supply independently of the first circuit block; A unit power supply unit that is driven through a line and supplies power to the first circuit block and the second circuit block;
The unit power supply unit supplies power to the second circuit block based on an instruction from the master unit received by the communication circuit. A measurement unit that is detachably connected to a master unit,
A drive power supply line and a detection power supply line interconnected between adjacent units;
A main circuit block driven via a driving power line;
A connection notification circuit that is driven via a power supply line for detection and outputs a connection notification signal to a master unit or a measurement unit adjacent to the master unit;
A measurement unit, wherein the connection notification circuit generates a connection notification signal based on a connection notification signal from a subsequent unit and outputs the connection notification signal to a master unit or a measurement unit adjacent to the master unit. With data communication lines interconnected between adjacent units,
The main circuit block includes a first circuit block including a communication circuit that performs data communication with the master unit via a data communication line, a second circuit block capable of controlling power supply independently of the first circuit block, and driving And a unit power supply unit that is driven through the power supply line and supplies power to the first circuit block and the second circuit block.
The measurement unit according to claim 13, wherein the unit power supply unit supplies power to the second circuit block based on an instruction from the master unit received by the communication circuit. A master unit that supplies bus power from a terminal device and can supply external power having a larger power capacity than bus power, and supplies power to one or more measurement units that are detachably connected. ,
Means for supplying bus power to the detection power line of the measurement unit;
Power supply switching means for selectively supplying bus power or external power to the drive power line of the measurement unit;
Power output means for connecting the selected supply source to the drive power line; and
A power control circuit that controls power output means based on a connection notification signal from a measurement unit driven by the detection power line when a bus power source is selected as a supply source to the drive power line. A master unit characterized by that. A communication means for performing data communication with a connected measuring unit via a data communication line;
The power control means for collecting attribute information of each measurement unit via the communication means and permitting an increase in power consumption in the measurement unit based on the collected attribute information. The master unit described in

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