JPS6324401A - Control device - Google Patents

Abstract

PURPOSE:To improve the safety of a device by specifing the upper limit and the lower limit of a set value beforehand and setting a controlled variable within the range of the upper lower limit value at the time of setting the controlled variable. CONSTITUTION:The upper lower limit value of the set value is set by upper lower limit value setting means 4 and 5 beforehand. At the time of setting the controlled variable, the controlled variable within the range of the specified upper lower limit value is set. Thus, the upper lower value specified beforehand cannot be exceeded and the controlled variable of the lower limit value or below cannot be set. For that reason, even when the set value is erroneous at the time of setting the controlled variable to match with a controlled system, the danger that the upper lower limit value specified beforehand is deviated is eliminated and the safety of the device can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a control device for controlling a controlled object, and particularly to a control device having a feature in setting a set value.

[Summary of the invention]

The control device according to the present invention improves the safety of the device by determining the upper and lower limits of the set value in advance and setting the control amount within the range of the upper and lower limit values when setting the control amount. be.

[Prior art and its problems]

(Prior Art) Conventional control devices, such as the temperature controller 23, control the temperature to a preset value or to a preset pattern of change. In order to perform such operations, it is necessary to set control variables such as temperature in advance. However, the conventional control 1111 device is configured such that the entire control temperature range of the device can be set as the set temperature.

(Problems to be Solved by the Invention) By the way, setting values that are preset depending on the type of controlled object often fall within a certain range.

However, if it is possible to set the entire controllable range of the control j711 device, there is a possibility that a value that deviates from the range may be set by mistake. Therefore, there is a problem in that incorrect settings may cause a failure in the controlled object or cause an accident.

[Object of the Invention] The present invention has been made in view of the problems of conventional control devices, and is designed to prevent set values from deviating from predetermined upper and lower limits. The technical challenge is to do so.

Structure and Effect of the Invention] (Structure of the Invention) The present invention controls the controlled variable to a preset value based on the signal from the input section 2 of the sensor 1 that detects the controlled variable of the controlled object 1. ? 111, the control device comprising:
As shown in FIG. 1, there is input means 3 for inputting a set value and upper and lower limit values that define the upper and lower limits of the set value, upper limit setting means 4 for setting the upper limit of the set value, and upper limit setting means 4 for setting the lower limit of the set value. a lower limit setting means 5 for setting the control amount; a controlled amount setting means 6 for setting the control 11 amount within the range of the upper and lower limit values set by the upper limit setting means 4 and the lower limit setting means 5 when setting the control amount;
An input switching means 7 for switching the input obtained from the input means 3 to the upper limit value setting means 4, the lower limit value setting means 5, and the control amount setting means 6; A storage means 8 having an area for storing a set upper limit value, a set lower limit value, and a set value of the lIl amount, and a controlled object is controlled based on the set value held in the storage means 8 and the control amount obtained from the sensor input section 2. A special feature of the present invention is that it has a control means 9 to

(Function) According to the present invention having such characteristics, the upper and lower limits of the set value are set in advance by the upper and lower limit value setting means 4.5. When setting the 1st lil ff1lffi, the control amount is set within the range of the predetermined upper and lower limit values.

(Effect) Therefore, according to the present invention, it is no longer possible to set a control amount that exceeds two predetermined limit values or is less than a lower limit value. Therefore, even if the set value is incorrect when setting the control amount in accordance with the controlled object, there is no possibility that the set value will deviate from the predetermined upper and lower limit values, and the safety of the apparatus can be increased.

[Explanation of Examples]

FIG. 2 is a block diagram showing the overall configuration of a temperature control device according to an embodiment of the present invention, and the same parts as in FIG. 1 are given the same reference numerals. In this figure, 11 is the degree adjustment device) upper and lower limit values and lower 1 (l (value setting and control if+I, t
, a setting device 1 which is an input means for inputting the control amount of i-elements l;
1. DIP switch 12, which is input switching means 7 for switching input modes. Set values for upper and lower limits, set values for controlled amounts, or restrictions? Display unit 13 for displaying the control amount for III. Sensor input unit 2 that detects the temperature of the controlled object l and converts it into a digital signal. a memory 14 which is a storage means 8 for storing upper and lower limits and set values set by the setting device 11; a CPU 15 which constitutes a control means 9 which controls the controlled object 1 according to a control amount given from the sensor input section 2; An output unit 16 is provided, which is made up of a heater and the like and is connected to the CPU 5 to directly control the controlled object 1. The memory 14 includes a read-only memory (hereinafter referred to as ROM) and a random access memory (hereinafter referred to as RAM). The ROM in the memory 14 stores the arithmetic processing procedures of the CPLI 15.
As shown in FIG. 2, the RAM has an area for storing upper and lower limit values given from the setter 11 and set values to be restricted, and an input buffer area.

FIG. 3 shows the front panel surface of the temperature 214 device which uses the setting section 11 and the display section 134. In this figure, the ``^'' and ``V'' keys are numerical control switches for raising and lowering the human horn value, respectively, and the ``Ω'' key is an input-1-1 for reading input values. In addition, the display section 13 includes a numerical display section for displaying input set values, current temperature, etc., and a set upper limit value.
``△'' and ``'' display sections are provided to display the lower limit set values, respectively.

Next, the operation of the temperature control device according to this embodiment will be explained with reference to flowchart 1. In the flowcharts below, numbers indicating leader lines indicate processing routines or operation steps of the CPU 15. When the power is turned on, first, in step 21, it is checked whether the input switch 12 is in the upper/lower limit value setting mode. If it is the upper/lower limit value setting mode, the process proceeds to step 22 and the upper limit value setting lamp "△" on the display section 13 is turned on. Then proceed to steps 23 and 24 and enter the
Ω" or the numerical control keys "^" and "ν" are pressed. If the numerical control key is pressed, the numerical value in the buffer area in the memory 14 is incremented or decremented and displayed on the display section 13 (step 25);
Returning to step 23, the same process is repeated. In this manner, the numerical value in the buffer area in the memory 14 is raised or lowered to an arbitrary upper limit value using the numerical control keys. For example, the setting range of the temperature control device is 170℃ to 230℃.
In the case of C, the upper limit value to be set is 230° C., so the ``^'' key is pressed continuously to set the value on the display unit 13 to 230. After that, if the human key "Ω" is pressed, the process proceeds from step 23 to step 26, where the numerical value held in the buffer is written into the upper limit value area. That is, in steps 21 to 26, the upper limit value setting means 4 sets the upper limit of the set value.
This function has been achieved.

Next, the process moves to the lower limit value setting mode, and in step 27, the lower limit value setting lamp "" is turned on. and step 28
．． Proceed to step 29 and press the human key “Ω”, the numerical control key “^J,
Check whether rvJ was pressed. Numerical side 4
If the ffll key is pressed, the process proceeds to step 2 30, where the numerical value in the buffer is incremented or decremented and displayed on the display unit 13, and the process returns to step 28. Then, repeat this operation until the human key rQJ is pressed (steps 28 to 30). If the human key "Ω" is pressed, proceed from step 2B to step 31 and write the data in the buffer to the lower limit value area. Then return to step 22. As mentioned above, if the setting range of the controlled object is 170°C or higher, the lower limit value to be set is 170'c, so press the "ν" key continuously to set the value on the display 13 to 170. .

After that, press the person key “Ω” and store that value in memory 14.
to be memorized. Steps 27 to 31 fulfill the function of the lower limit value setting means 5 which sets the lower limit of the set value.

After the upper and lower limit values are stored in the memory 14 in this manner, the power is turned off and the input switching dip switch 12 is switched to the normal control amount setting mode. When the power is turned on again, the process proceeds from step 21 to step 32 and enters the temperature setting mode, where the lower limit set value is read into the buffer area of the memory 14 and displayed on the display section 13. And step 33.
Proceed to 34 and enter the human key “Ω” or numerical control = 1--r^
”, check if “ν” is pressed. If the numerical control key is pressed, the process proceeds from step 34 to step 35, where it is checked whether the change is within a predetermined upper and lower limit value range, and if the change is within this range, the process proceeds to step 36, where the value of the buffer area is is incremented or decremented, and the display on the display unit 13 is changed. If it is not within the upper and lower limits, the process returns to step 34 and the same process is repeated until the key is pressed.

If the input key is pressed, step 33 to step 37
Proceed to , write the data in the buffer area as a set value, and end the process. The stainless steels 132 to 37 achieve the function of the control 11 quantity setting means 6 for setting the control quantity. In the normal control mode, the control target is continuously controlled based on this set value.

In this way, the temperature can be set within the range of the upper II fJ and lower limit values set in advance.

Therefore, since a predetermined range of the possible control range of the control device can be set as the set value, the possibility of setting an incorrect value is reduced, and safety can be increased.

[Brief explanation of the drawing]

FIG. 1 is a functional block diagram showing the configuration of the present invention, FIG. 2 is a block diagram showing the configuration of a temperature control device according to an embodiment of the present invention, and FIG. 3 is a diagram showing the Freon 1-panel surface. FIG. 4 is a flowchart I showing the operation of this embodiment. i ------Controlled object 2-----Sensor input section 3--Input means 4------Upper limit value setting means 5--Lower limit value setting means 6-- −
・Controlled amount setting means 7---Input switching means
8-----One tQ means 9-----Control means
11-- Setting device 12-- DIP switch 13-- Display section 14-- Memory
1 5--・-1-・ CPU Patent Applicant Tateishi Electric Co., Ltd. Agent Patent Attorney Kanki Okamoto (and 1 other person) @Figure 1 Figure 2 Figure 37 Figure 4

Claims (2)

[Claims] (1) A control device that controls a controlled variable to a preset value based on a signal from a sensor input unit that detects a controlled variable of a controlled object, and includes a set value and upper and lower limits of the set value. an input means for inputting upper and lower limit values for determining the set value; an upper limit value setting means for setting the upper limit of the set value; a lower limit value setting means for setting the lower limit of the set value; a control amount setting means for setting a control amount within a range of upper and lower limit values set by the value setting means; and an input obtained from the input means, the upper limit value setting means;
input switching means for switching between a lower limit value setting means and a controlled amount setting means; a storage means having an area for storing a set upper limit value, a set lower limit value, and a set value of the control amount; and a set value held in the storage means. and a control means for controlling a controlled object based on a control amount obtained from a sensor input section. (2) The control device according to claim 1, wherein the control device is a temperature regulator that controls the temperature of a controlled object.