CN102970029A - High-safety digital quantity signal acquisition circuit - Google Patents
High-safety digital quantity signal acquisition circuit Download PDFInfo
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- CN102970029A CN102970029A CN2012104386897A CN201210438689A CN102970029A CN 102970029 A CN102970029 A CN 102970029A CN 2012104386897 A CN2012104386897 A CN 2012104386897A CN 201210438689 A CN201210438689 A CN 201210438689A CN 102970029 A CN102970029 A CN 102970029A
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Abstract
The invention discloses a high-safety digital quantity signal acquisition circuit which comprises an acquisition circuit U1 and a processor. The acquisition circuit U1 acquires digital signals, the processor is connected with the acquisition circuit U1and processes the acquired signals, the processor is further connected with a redundance acquisition circuit U2 which is in parallel connection with the acquisition circuit U1 and simultaneously acquires digital signals, and the processor judges whether the current acquiring process is normal or not according to whether the acquired signals of the acquisition circuit U1 and the acquired signals of the redundance acquisition circuit U2 are identical or not. According to the high-safety digital quantity signal acquisition circuit, redundance acquisition and arbitration mechanism of the digital quantity signals are achieved, two-way optocouplers are used for simultaneously acquiring same way signals, and reliability of one-time acquisition is guaranteed by means of redundance acquisition; and the requirement of high diagnostic coverage rates is met under the field application that conventional acquisition signals are high levels (24V) and key signals are low levels or falling edges. According to the high-safety digital quantity signal acquisition circuit, by means of the simplest way, channel self-measuring functions are achieved, and cost optimization effects are achieved.
Description
Technical field
The present invention relates to a kind of signal acquisition circuit, be specifically related to the digital quantity signal Acquisition Circuit on a kind of industrial control system.
Background technology
Data acquisition, refer to the process of automatic Information Monitoring from the analog or digital unit under tests such as transducer or other Devices to test, wherein the digital quantity signal Acquisition Circuit can not affect under the prime signal output state, the prime signal is gathered, catches, then carry out certain processing (mainly being de-jitter), then the signal that is disposed is passed to processor.Common digital signal acquiring circuit as shown in Figure 1, its digital quantity signal Acquisition Circuit cardinal principle is: when input (In) input useful signal (being generally 24V or 48V), by resistance R 1 current limliting, then by R2 the electric current that flows through optocoupler IC1 is carried out suitable flow-dividing control, when the electric current that flows through optocoupler IC1 interior light emitting diodes reaches certain value, trigger the conducting of rear class triode, then Out and earth signal short circuit are exported to the rear class low level signal.And do not input useful signal or signal when not high enough as In, after then passing through resistance R 1, resistance R 2 current limlitings and flow-dividing control, flow through the undercurrent of optocoupler IC1 interior light emitting diodes to trigger the triode conducting of rear class, then Out holds the resistance R 3 that is equivalent to connect to link to each other with V+, and the voltage of therefore exporting to rear class approximates V+(and supposes usually that here rear class input impedance is enough high).Can see that by this design the variation of prime input In directly affects the output of rear class Out, thereby played the effect that digital quantity signal gathers, owing to adopted optocoupler, the light-emitting diode that is optocoupler IC1 inside triggers the conducting of rear class triode by light signal, thereby has a withstand voltage effect of good isolation, the signal of telecommunication of Out end can not hold the signal of telecommunication to impact to In, and the large voltage and current signal of In end can not flow into the Out end yet, causes the infringement to the Out end.The foregoing circuit simplicity of design is reliable, and cost is lower, thereby uses in a large number in the digital quantity signal acquisition technique of industrial control field, has very high use value.
But when being applied to reliability, when fail safe has the specific area of requirements at the higher level (for example nuclear power station control field), this circuit then often can't satisfy system requirements.This is that all there are the failure conditions of various patterns in circuit or device because in routine use.For example: when welding procedure occurring and cause optocoupler IC1 to be connected pin with resistance R 1 rosin joint, optocoupler IC1 front end short circuit etc. phenomenon occurring, the consequence that these failure modes cause is that signal In and circuit output signal Out that actual acquisition is arrived are just inconsistent, and the user is difficult in time find this problem when reality is used.The industrial control field that this situation is had relatively high expectations in nuclear power station control field or other safe classes is unacceptable.
In addition; existing digital quantity signal Acquisition Circuit failure diagnosis coverage rate is inadequate; in addition; reverse withstand voltage protective capability is not enough; the reverse withstand voltage and protective capacities of its partial circuit relies on the protective capacities of optocoupler self fully; and optocoupler direction protective capacities is on the weak side, and conventional optocoupler diode reverse is withstand voltage to be 8V(to the maximum here with reference to the MOCD213 device parameters), can't satisfy application requirements.
Summary of the invention
For solving the low problem of digital quantity signal Acquisition Circuit fail safe in the prior art, the invention provides a kind of high security digital quantity signal Acquisition Circuit, concrete scheme is as follows: a kind of high security digital quantity signal Acquisition Circuit, comprise the redundant Acquisition Circuit U1 that gathers digital signal, exclusive self-detection circuit and corresponding redundant signals processing logic, it is characterized in that: one. adopted redundant Acquisition Circuit scheme (U1 and U2) digital quantity signal to be gathered Effective Raise Acquisition Circuit reliability; Two. adopted exclusive self-detection circuit (U3), this circuit is for application-specific, can cover complete from detection; Three, Acquisition Circuit guard section (U1 and U2 front end backward diode D1 and D2 and high-power resistance R1), effectively back-pressure preventing, overpressure situation occur.，
Redundant acquisition scheme adopts in the same way Redundancy Design: use identical two-way Acquisition Circuit simultaneously one road input signal to be gathered, and by in the same way logic comparison, when collection signal is identical, gather normally, signal is effective; Otherwise acquisition abnormity then, collection signal is invalid.
For digital quantity signal acquisition circuit self is carried out fault detect: be connected with passage self-checking circuit U3 between described processor and Acquisition Circuit U1 and the redundant Acquisition Circuit U2, passage self-checking circuit U3 passes through the direct conducting of the both positive and negative polarity of Acquisition Circuit U1 and redundant Acquisition Circuit U2, and whether consistent with redundant Acquisition Circuit U2 output signal according to Acquisition Circuit U1 after the conducting, judge whether Acquisition Circuit U1 and redundant Acquisition Circuit U2 have fault.
Preferably: described Acquisition Circuit U1 is with to be connected Acquisition Circuit U2 annexation as follows: the positive pole of diode is connected with on-the-spot DI+ in the optocoupler IC1, negative pole is connected with on-the-spot DI-, is parallel with the diode D1 of resistance R 5 and Opposite direction connection between optocoupler IC1 diode both positive and negative polarity; The E utmost point of triode is connected with processor and exports collection signal DI_A, C utmost point ground connection in the optocoupler IC1; The positive pole of diode is connected with on-the-spot DI+ in the optocoupler IC2, and negative pole is connected with on-the-spot DI-, at the diode D2 that is parallel with resistance R 6 and Opposite direction connection between optocoupler IC2 diode; The E utmost point of triode is connected with processor and exports collection signal DI_B, C utmost point ground connection in the optocoupler IC2; The both positive and negative polarity of diode D1, D2 interconnects, and is in series with resistance R 1 between negative pole and the on-the-spot DI+, is connected with external power source V+ after wherein optocoupler IC1 is connected the E utmost point of triode respectively series resistance R3 is connected with resistance R with optocoupler IC2.
Preferably: the circuit connecting relation of described passage self-checking circuit U3 is as follows: be connected with external power source V+ behind the cathode series resistance R4 of diode in the light MOS, negative pole is connected with processor and receiving key signal DI_ST, and two outputs of light MOS internal trigger switch are connected the positive pole of diode with optocoupler IC1 respectively and are connected with negative pole with optocoupler IC2.
The present invention has realized redundancy collection and the arbitration mechanism that digital quantity signal gathers, and utilizes the two-way optocoupler to gather simultaneously same road signal, Effective Raise the reliability of signals collecting, processor can be confirmed the running status of current circuit by arbitration mechanism; The present invention increases the low level signal analog input circuit, and then the state in the time of can simulating prime signal input low level by this circuit compares the reliability of confirming Acquisition Circuit by the Acquisition Circuit retaking of a year or grade; The present invention can be simultaneously as the digital quantity signal input unit of periodical test, and the present invention also has anti-reverse function, can prevent from damaging because oppositely accessing the passage that causes; Optimize on the Performance and Cost Modeling of the present invention to the digital quantity signal acquisition circuit and compromise, both realized the acquisition function of high reliability, also guarantee simultaneously the reliability of single acquisition by the redundancy collection; And be high (24V or 48V) at conventional collection signal, key signal is the requirement of having satisfied high diagnosis coverage rate under the field of low level or trailing edge.The present invention has realized the passage self-checking function by the simplest mode, thereby has reached the effect of cost optimization.
Description of drawings
Digital signal acquiring circuit connection diagram in Fig. 1 prior art;
Fig. 2 digital quantity signal Acquisition Circuit of the present invention connection diagram.
Embodiment
As shown in Figure 2, the high security digital quantity signal Acquisition Circuit that the present invention relates to, comprise the Acquisition Circuit U1 that gathers digital signal, be connected the processor that collection signal is processed with Acquisition Circuit U1, processor also is connected with the redundant Acquisition Circuit U2 that gathers digital signal the time in parallel with Acquisition Circuit U1, and processor judges according to the collection signal of Acquisition Circuit U1 and redundant Acquisition Circuit U2 is whether consistent whether current gatherer process is normal.
The present invention carries out routine collection by Acquisition Circuit U1 and redundant Acquisition Circuit U2, when normal the collection, processor is high level or low level by the incoming level that the collection signal DI_A that gathers simultaneously and collection signal DI_B can recognize prime, owing to adopted redundant acquisition mode, can know when Acquisition Circuit is in normal operating conditions, the collection signal DI_A of output and the signal of collection signal DI_B must be consistent, the collection signal DI_A and the collection signal DI_B that namely receive simultaneously are high level or low level simultaneously, represent that the signal of current collection is no problem; When both inconsistent situations appearred in the collection signal DI_A that receives and collection signal DI_B, it was unusual to show that then current Acquisition Circuit exists, and then can take corresponding measure, reaches and improves the requirement that reliability gathers.
In order under off position, Acquisition Circuit U1 and redundant Acquisition Circuit U2 to be detected, the present invention is connected with passage self-checking circuit U3 between processor and Acquisition Circuit U1 and redundant Acquisition Circuit U2, passage self-checking circuit U3 passes through the direct conducting of the both positive and negative polarity of Acquisition Circuit U1 and redundant Acquisition Circuit U2, and whether consistent with redundant Acquisition Circuit U2 output signal according to Acquisition Circuit U1 after the conducting, judge whether Acquisition Circuit U1 and redundant Acquisition Circuit U2 have fault.Processor sends detection signal to passage self-checking circuit U3, passage self-checking circuit U3 receives behind the signal the direct short circuit of the incoming end of Acquisition Circuit U1 and redundant Acquisition Circuit U2, whether processor is consistent with collection signal DI_B with the collection signal DI_A of redundant Acquisition Circuit U2 output according to Acquisition Circuit U1, judges whether both break down.
Circuit connecting relation of the present invention is as follows: among the Acquisition Circuit U1 in the optocoupler IC1 positive pole of diode be connected negative pole with on-the-spot DI+ and be connected with on-the-spot DI-, be parallel with the diode D1 of resistance R 5 and Opposite direction connection between the optocoupler IC1 diode both positive and negative polarity; The E utmost point of triode is connected with processor and exports collection signal DI_A, C utmost point ground connection in the optocoupler IC1; Among the redundant Acquisition Circuit U2 in the optocoupler IC2 positive pole of diode be connected negative pole with on-the-spot DI+ and be connected with on-the-spot DI-, be parallel with the diode D2 of resistance R 6 Opposite direction connections between the optocoupler IC2 diode both positive and negative polarity; The E utmost point of triode is connected with processor and exports collection signal DI_B, C utmost point ground connection in the optocoupler IC2; The both positive and negative polarity of diode D1, D2 interconnects, and is in series with resistance R 1 between negative pole and the on-the-spot DI+, is connected with external power source V+ after wherein optocoupler IC1 is connected the E utmost point of triode respectively series resistance R3 is connected with resistance R with optocoupler IC2; Be connected with external power source V+ behind the cathode series resistance R4 of diode in the light MOS of passage self-checking circuit U3, negative pole is connected with processor and receiving key signal DI_ST, and two outputs of light MOS internal trigger switch are connected the positive pole of diode with optocoupler IC1 respectively and are connected with negative pole with optocoupler IC2.
When on-the-spot DI+ access+24V voltage, when on-the-spot DI-termination enters GND, by suitable dividing potential drop, the light-emitting diode of optocoupler IC1, the optocoupler IC2 of voltage meeting triggering collection circuit U 1 and redundant Acquisition Circuit U2 inside is opened, light-emitting diode can trigger the triode conducting of optocoupler IC1 and the inner rear class of optocoupler IC2 after opening, because the inner triode conducting of optocoupler IC1 and optocoupler IC2, then actual equivalence be its E extremely all with ground connection GND short circuit, the collection signal DI_A and the collection signal DI_B that collect by processor at this moment are low level signal (GND); When on-the-spot DI+ and on-the-spot DI-all access on-the-spot GND, the front level led of optocoupler IC1 and optocoupler IC2 can't work, therefore the rear class triode disconnects, and the E utmost point that is equivalent to both this moment advances external power source (V+) by resistance R 2 and resistance R 3 accesses respectively; Collection signal DI_A and collection signal DI_B that this moment, processor collected are high level signal (V+).
Outside above-mentioned conventional the collection, the negative pole receive path of the middle diode of passage self-checking circuit U3 is from sense switch signal DI_ST, when switching signal DI_ST effective (this circuit is for effectively low) is sent in processor control, light MOS interior light emitting diodes is started working luminous, thereby trigger the conducting of rear class trigger switch, this directly is equivalent to the on-the-spot DI+ of Acquisition Circuit U1 and redundant Acquisition Circuit U2 and on-the-spot DI-conducting.Because there are not pressure reduction in on-the-spot DI+ and on-the-spot DI-, the light-emitting diode operating state of optocoupler IC1 and optocoupler IC2 is equivalent to the effect that on-the-spot DI+ and on-the-spot DI-all access on-the-spot GND, and the collection signal DI_A that processor collects and collection signal DI_B output are high level signal (V+); Like this by the light MOS circuit equivalent introduced in to Acquisition Circuit U1 and redundant Acquisition Circuit U2 analog input low level signal.
The main application background of digital quantity signal Acquisition Circuit of the present invention is on-the-spot conventional access 24V or 48V high level signal, being on-the-spot DI+ links to each other with on-the- spot 24V or 48V and control end, on-the-spot DI-links to each other with on-the-spot GND, when crucial the variation appears in the scene, be that on-the-spot DI+ becomes GND from 24V/48V, fully equivalence of the function that passage self-checking circuit U3 realizes in this variation and the digital quantity signal Acquisition Circuit, therefore can completely simulate the situation that feeds of on-the-spot key signal by passage self-checking circuit U3, thereby improve the failure diagnosis rate (only depending on redundant the collection is can't the simulated field actual signal to feed situation) of whole channel circuit.When the scene with on-the-spot DI+ and on-the-spot DI-misconnection inverse time, i.e. on-the-spot DI+ access GND and on-the-spot DI-access 24V/48V is unallowed under the regular situation, but this digital quantity signal acquisition circuit still can effectively protect not damaging under any circuit conditions.This moment, then on-the-spot DI-termination has entered the direct conducting of 24V/48V above-mentioned two diodes were back to on-the-spot DI+ by circuit R1 because the digital quantity signal Acquisition Circuit has been introduced diode D1 and diode D2; Resistance R 1 has then played the effect of whole current limliting, and the effect played of resistance R 1 is consistent in this effect and the normal operation, thereby can the circuit of scene and harvester not had any impact.
The present invention only needs two optocouplers and light metal-oxide-semiconductor can realize fault detect and the protection of digital quantity signal Acquisition Circuit, has reduced cost.
The above only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet be not to limit the present invention, anyly be familiar with the technical staff of this patent within not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned prompting is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the present invention program's the scope.
Claims (4)
1. high security digital quantity signal Acquisition Circuit, comprise the Acquisition Circuit U1 that gathers digital signal, be connected the processor that collection signal is processed with Acquisition Circuit U1, it is characterized in that, described processor also is connected with the redundant Acquisition Circuit U2 that gathers digital signal the time in parallel with Acquisition Circuit U1, and described processor judges according to the collection signal of Acquisition Circuit U1 and redundant Acquisition Circuit U2 is whether consistent whether current gatherer process is normal.
2. a kind of high security digital quantity signal Acquisition Circuit as claimed in claim 1, it is characterized in that, be connected with passage self-checking circuit U3 between described processor and Acquisition Circuit U1 and the redundant Acquisition Circuit U2, passage self-checking circuit U3 passes through the direct conducting of the both positive and negative polarity of Acquisition Circuit U1 and redundant Acquisition Circuit U2, and whether consistent with redundant Acquisition Circuit U2 output signal according to Acquisition Circuit U1 after the conducting, judge whether Acquisition Circuit U1 and redundant Acquisition Circuit U2 have fault.
3. a kind of high security digital quantity signal Acquisition Circuit as claimed in claim 2, it is characterized in that, described Acquisition Circuit U1 is with to be connected Acquisition Circuit U2 annexation as follows: the positive pole of diode is connected with on-the-spot DI+ in the optocoupler IC1, negative pole is connected with on-the-spot DI-, is parallel with the diode D1 of resistance R 5 and Opposite direction connection between optocoupler IC1 diode both positive and negative polarity; The E utmost point of triode is connected with processor and exports collection signal DI_A, C utmost point ground connection in the optocoupler IC1; The positive pole of diode is connected with on-the-spot DI+ in the optocoupler IC2, and negative pole is connected with on-the-spot DI-, at the diode D2 that is parallel with resistance R 6 and Opposite direction connection between optocoupler IC2 diode; The E utmost point of triode is connected with processor and exports collection signal DI_B, C utmost point ground connection in the optocoupler IC2; The both positive and negative polarity of diode D1, D2 interconnects, and is in series with resistance R 1 between negative pole and the on-the-spot DI+, is connected with external power source V+ after wherein optocoupler IC1 is connected the E utmost point of triode respectively series resistance R3 is connected with resistance R with optocoupler IC2.
4. a kind of high security digital quantity signal Acquisition Circuit as claimed in claim 3, it is characterized in that, the circuit connecting relation of described passage self-checking circuit U3 is as follows: be connected with external power source V+ behind the cathode series resistance R4 of diode in the light MOS, negative pole is connected with processor and receiving key signal DI_ST, and two outputs of light MOS internal trigger switch are connected the positive pole of diode with optocoupler IC1 respectively and are connected with negative pole with optocoupler IC2.
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| CN105404199A (en) * | 2015-11-12 | 2016-03-16 | 中国南方电网有限责任公司 | Self-detection circuit for implementing digital input circuit based on pulse injection method |
| CN106773885A (en) * | 2015-11-24 | 2017-05-31 | 中车大连电力牵引研发中心有限公司 | Digital acquisition circuit and system |
| CN106773885B (en) * | 2015-11-24 | 2019-06-21 | 中车大连电力牵引研发中心有限公司 | Digital acquisition circuit and system |
| CN105717342A (en) * | 2016-03-18 | 2016-06-29 | 浙江中控技术股份有限公司 | Analog quantity current input collecting system |
| CN105717342B (en) * | 2016-03-18 | 2018-10-16 | 浙江中控技术股份有限公司 | A kind of analog quantity electric current input acquisition system |
| CN106291167A (en) * | 2016-07-26 | 2017-01-04 | 北京安控科技股份有限公司 | A kind of one takes a functional safety digital quantity input module adding diagnosis |
| CN106125618B (en) * | 2016-07-29 | 2019-01-08 | 中车大连电力牵引研发中心有限公司 | Digital signal acquiring circuit, digital signal acquiring board |
| CN106125618A (en) * | 2016-07-29 | 2016-11-16 | 中车大连电力牵引研发中心有限公司 | Digital signal acquiring circuit, digital signal acquiring board |
| CN106253903A (en) * | 2016-07-29 | 2016-12-21 | 中车大连电力牵引研发中心有限公司 | Digital quantity acquiring circuit |
| CN106253903B (en) * | 2016-07-29 | 2019-08-16 | 中车大连电力牵引研发中心有限公司 | Digital quantity acquiring circuit |
| CN106655504A (en) * | 2016-11-29 | 2017-05-10 | 国网河南省电力公司安阳供电公司 | Safe and reliable data acquisition system |
| CN107065716A (en) * | 2016-12-20 | 2017-08-18 | 中核控制系统工程有限公司 | A kind of digital quantity acquiring circuit with dynamic diagnosis failures |
| CN107065716B (en) * | 2016-12-20 | 2020-05-22 | 中核控制系统工程有限公司 | Digital quantity acquisition circuit with dynamic fault diagnosis capability |
| CN107607862A (en) * | 2017-09-01 | 2018-01-19 | 北京龙鼎源科技股份有限公司 | Circuit state diagnostic circuit and method |
| CN108107866A (en) * | 2017-11-24 | 2018-06-01 | 中核控制系统工程有限公司 | A kind of high-speed pulse amount Acquisition Circuit with dynamic diagnosis failures |
| CN108107866B (en) * | 2017-11-24 | 2020-07-28 | 中核控制系统工程有限公司 | High-speed pulse quantity acquisition circuit with dynamic fault diagnosis capability |
| CN111103862B (en) * | 2018-10-25 | 2023-08-08 | 比亚迪股份有限公司 | Digital quantity acquisition circuit with self-diagnosis function |
| CN111103862A (en) * | 2018-10-25 | 2020-05-05 | 比亚迪股份有限公司 | Digital quantity acquisition circuit with self-diagnosis function |
| CN109976427A (en) * | 2019-04-24 | 2019-07-05 | 深圳英飞源技术有限公司 | A kind of power-supply system of low standby power loss |
| CN109976427B (en) * | 2019-04-24 | 2024-04-19 | 深圳英飞源技术有限公司 | Power supply system with low standby power consumption |
| CN110596450A (en) * | 2019-10-29 | 2019-12-20 | 北京和利时智能技术有限公司 | Analog signal acquisition channel circuit |
| CN110967551A (en) * | 2019-12-06 | 2020-04-07 | 北京和利时智能技术有限公司 | Current signal redundancy acquisition circuit |
| CN111427959A (en) * | 2020-03-27 | 2020-07-17 | 北京贝斯平云科技有限公司 | Data storage method and device |
| CN111427959B (en) * | 2020-03-27 | 2024-04-23 | 北京贝斯平云科技有限公司 | Data storage method and device |
| CN112666447A (en) * | 2020-12-18 | 2021-04-16 | 北京航天自动控制研究所 | Plate position identification circuit applied to dual-redundancy framework equipment |
| CN112837834A (en) * | 2020-12-31 | 2021-05-25 | 江苏核电有限公司 | Off-line inspection device and method for in-situ measurement channel performance of off-core nuclear measurement system |
| CN114035499A (en) * | 2021-11-13 | 2022-02-11 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Wireless communication device and method for remote dual-protection control |
| CN116754931A (en) * | 2023-08-16 | 2023-09-15 | 新誉集团有限公司 | Self-checking method and self-checking circuit for digital input loop |
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