CN107193270B - Digital quantity output channel self-diagnosis detection circuit, detection device and detection method - Google Patents
Digital quantity output channel self-diagnosis detection circuit, detection device and detection method Download PDFInfo
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- 238000004092 self-diagnosis Methods 0.000 title claims abstract description 57
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- 238000002955 isolation Methods 0.000 description 9
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
- G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
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Abstract
The invention belongs to the technical field of industrial control, and provides a digital quantity output channel self-diagnosis detection circuit, a detection device and a detection method, which are used for solving the technical scheme that the self-diagnosis of a digital quantity output channel is not simply and reliably detected in the prior art; the circuit comprises: an electromagnetic relay configured to receive the digital quantity control signal and output an electric signal converted by the electromagnet to an external circuit; the electromagnetic relay comprises two groups of output contacts, wherein one group of contacts is used as a dry contact to form a dry contact output branch, and the other group of contacts is connected to the input signal control circuit to form a detection readback branch. Therefore, the method can simplify the design of the self-diagnosis circuit of the digital quantity output channel by using a simple and reliable pure hardware detection circuit and method, and can be simultaneously suitable for the self-diagnosis of the wet-joint and dry-joint digital quantity output channels.
Description
Technical Field
The invention relates to the technical field of industrial control, in particular to the technical field of a distributed control system in the industrial control industry, and more particularly relates to a digital quantity output channel self-diagnosis detection circuit, a detection device and a detection method.
Background
In the field of industrial control, especially in nuclear power DCS (English full name Distributed Control System, chinese translation is a distributed control system) with high requirements on system safety, the system availability generally requires 99.99%, and improving the self-diagnosis coverage rate of various aspects of the system is an important measure for improving the availability, so that the research on the self-diagnosis design of an output channel in the DCS is very important to those skilled in the art.
For example, chinese patent application No. CN201610730083.9 discloses a digital output channel self-checking system based on FPGA, which includes: the driving switch tube is connected with the loop extraction circuit, and the FPGA is respectively connected with the driving switch tube and the loop extraction circuit through the photoelectric isolator to form a self-checking channel; the method can solve the problem of providing multichannel parallel processing, detect faults in real time and improve the reaction speed; the self-checking pulse width is dynamic self-adaption, so that the technical problems of influence of self-checking on normal output of a channel and the like are reduced to the greatest extent.
The inventors have found that the above prior art does not describe or improve upon the specific structure within the diagnostic circuitry in practicing the present invention. The prior art as shown in fig. 1 and 2 is a specific detection circuit for a wet-contact and a dry-contact type digital output channel, respectively. The following technical problems exist in the detection circuit for wet contact output (externally provided voltage) in the digital channel corresponding to fig. 1: to achieve isolation between the channel power supply (48 v+) and the digital circuit ground (3V 3 GND) an optocoupler or other isolation circuit is required, which increases the complexity of the circuit. The following technical problems exist in the detection circuit of the dry contact output (no external voltage is provided and only the contact point is provided) in the digital channel corresponding to fig. 2: because the query power supply is accessed outside the board card, the detection circuit cannot form a loop, and the circuit of the query power supply cannot be used for channel self-diagnosis.
Therefore, the technical scheme in the prior art exists: can only be used for monitoring the wet junction output type, cannot be used for read-back detection of the dry junction output channel, and also requires a special isolation circuit.
Disclosure of Invention
In order to solve the technical scheme that the self-diagnosis of the digital quantity output channel is not simply and reliably detected in the prior art, the invention provides a self-diagnosis detection circuit, a detection device and a detection method of the digital quantity output channel; the method can simplify the design of the self-diagnosis circuit of the digital quantity output channel by using a simple and reliable pure hardware detection circuit and method, and is applicable to the self-diagnosis of the wet-joint and dry-joint digital quantity output channels.
The invention also provides a digital quantity output channel self-diagnosis detection circuit, a detection device and a detection method, which can realize the isolation requirement through a simple hardware detection circuit and a simple hardware detection method.
In order to achieve the above object, the technical solution provided by the embodiments of the present invention includes:
in one aspect, a digital quantity output channel self-diagnosis detection circuit is provided, which is characterized in that the detection circuit comprises:
an electromagnetic relay configured to receive a digital control signal and output an electric signal converted by the electromagnet to an external circuit;
the electromagnetic relay comprises two groups of output contacts, wherein one group of contacts is used as a dry contact to form a dry contact output branch, and the other group of contacts is connected to the input signal control circuit to form a detection readback branch.
In the embodiment of the invention, preferably, the electromagnetic relay is a multi-blade relay, the multi-blade relay is provided with two groups of output contacts, one group of contacts is used as a dry contact to form a dry contact output branch, and the other group of contacts is connected to the input signal control circuit to form a detection readback branch.
Preferably, the detection readback branch further comprises a resistive element arranged between a first contact of the further set of contacts and ground, and a power supply arranged to be connected to a second contact of the further set of contacts; and the input signal control circuit obtains the relay status information from a first contact of the other set of contacts.
In the embodiment of the invention, preferably, the multi-pole relay is a double-pole double-throw relay.
In the embodiment of the invention, preferably, the output terminal of the detection readback branch is fixedly arranged on the self-diagnosis detection circuit board of the digital quantity output channel.
In the embodiment of the invention, preferably, two groups of output contacts in the electromagnetic relay are distributed in a completely electrically isolated state inside the electromagnetic relay.
In the embodiment of the invention, preferably, the armature in the relay is composed of a non-conductive substance, and the non-conductive substance is also arranged outside a connecting circuit between the two groups of output contacts in the electromagnetic relay and the coil.
In another aspect, the present invention also provides a digital output channel self-diagnosis detection device, which is characterized in that the detection device includes:
an input signal control circuit for receiving a control signal of the digital quantity output;
an output signal control circuit for outputting a control signal to the controlled operation circuit;
and a digital quantity output channel self-diagnosis detection circuit connected with the data digital signal output channel, wherein the self-diagnosis detection circuit is any one of the circuits.
In the embodiment of the invention, preferably, in the working process of the detection device, the detection circuit reads whether the detection readback branch meets the preset requirement in real time, and outputs a signal whether the digital quantity output channel is good or not based on the signal output by the detection readback branch.
In a third aspect, the present invention also provides a digital output channel self-diagnosis detection method, which is characterized in that the digital output channel is connected with the digital output channel self-diagnosis detection device, and the detection method includes:
powering up the digital quantity output channel self-diagnosis detection device, so that the digital quantity output channel self-diagnosis detection device outputs signals;
and acquiring the signal from the detection readback branch, and judging whether the data channel is good or not based on the output signal of the detection readback branch.
By adopting the technical scheme provided by the embodiment of the invention, at least one of the following beneficial effects can be obtained:
1. two groups of branches are respectively connected to two groups of contacts connected with the relay, one group of contacts is used for inquiring the output voltage of the dry contact, the other group of contacts form a detection readback branch, and whether the data channel is good or not is judged based on the output signal of the detection readback branch; therefore, the method can be applied to both wet-junction and dry-junction digital quantity output self-diagnosis.
2. Two groups of branches are respectively connected to two groups of contacts connected with the relay, and other extra circuits are not needed to be additionally arranged, so that the design of the self-diagnosis circuit of the digital quantity output channel can be simplified.
3. The two paths of output contacts of the relay are directly distributed to be mutually isolated, so that the isolation of the output of the digital quantity channel and the output control circuit can be realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure and/or process particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
FIG. 1 is a schematic diagram of a digital output wet contact type circuit in the prior art;
FIG. 2 is a schematic diagram of a digital output dry-contact type circuit in the prior art;
FIG. 3 is a schematic diagram of a control device in which a relay is located in the prior art;
FIG. 4 is a schematic diagram of a circuit for diagnosing and determining whether a relay coil is good or not by using a contact action delay time of a relay in the prior art;
FIG. 5 is a block diagram of a digital output channel self-diagnosis detection device according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a digital output channel self-diagnosis detection circuit according to an embodiment of the present invention;
FIG. 7 is a schematic circuit diagram of a double-pole double-throw relay of a digital output channel self-diagnosis detection circuit according to an embodiment of the present invention;
FIG. 8 is a simplified schematic diagram of a double pole double throw relay of a digital output channel self-diagnosis detection circuit according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a control device where a double-pole double-throw relay of a digital output channel self-diagnosis detection circuit is located;
fig. 10 is a flowchart of a digital output channel self-diagnosis detection method according to an embodiment of the present invention.
Detailed Description
The following will describe embodiments of the present invention in detail with reference to the drawings and examples, thereby solving the technical problems by applying technical means to the present invention, and realizing the technical effects can be fully understood and implemented accordingly. It should be noted that these specific descriptions are only for easy and clear understanding of the present invention by those skilled in the art, and are not meant to be limiting; and as long as no conflict is formed, each embodiment of the present invention and each feature of each embodiment may be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
Additionally, the steps illustrated in the flowcharts of the figures may be performed in a control system such as a set of controller-executable instructions, and although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that herein.
The following describes the technical scheme of the invention in detail through the attached drawings and specific embodiments:
as described in the background of fig. 1 and 2, the prior art exists for monitoring only the wet junction output type, not for read-back detection of the dry junction output channel, and also requires a dedicated isolation circuit.
Another conceivable detection method is to input a rapid pulse into the coil by using the contact action delay time of the relay, and then detect whether the rear end has signal output by using a detection circuit, and once judge whether the coil has faults; specifically, as shown in fig. 3 and 4, the principle of the control device where the relay is located is as follows: the primary side of the relay coil is connected to the input side control circuit 110 corresponding to the low voltage power supply, and the input side control circuit can receive a digital signal from the digital output channel, so that the electromagnet 128 of the relay 120 is electrified, the armature 124 in the relay 120 is attracted to the electromagnet, then the spring 122 in the relay 120 is compressed, and the contacts in the relay 120 are attracted to each other, so that the high voltage working circuit on the output side can be conducted, and the controlled object (such as the motor 130) of the output side control circuit can work. Then, in the circuit shown in fig. 4, a rapid pulse is input between the digital output channel and the electromagnetic relay, and a detection circuit is used to detect whether a signal is output from the rear end, so as to determine whether the coil is faulty. However, this method can only detect the failure of the relay coil, which is composed of a plurality of units, and the coil is only a part, so that the detection of the relay by the means provided by this method is incomplete.
As shown in fig. 5, the present embodiment provides a digital output channel self-diagnosis detection circuit, which includes:
an electromagnetic relay configured to receive the digital control signal and output an electric signal converted by the electromagnet to an external circuit; specifically, the input ends 012, 014 of the electromagnetic relay coil 010 are configured to receive a digital quantity control signal from the processor of the DCS, and after passing through the electromagnetic relay, to externally output an electric signal converted by the electromagnet, for example, an electric signal to be turned on to a high voltage output circuit;
the electromagnetic relay comprises two groups of output contacts 020 and 030, wherein one group of contacts 020 is used as a dry contact point to form a dry contact point output branch circuit, and the other group of contacts 030 is connected to an input signal control circuit to form a detection readback branch circuit.
It should be noted that the number of contacts in fig. 5 is only one case of the embodiment of the present invention, and those skilled in the art may set more groups of contacts, and the number of the outgoing points in each group of contacts and the positional arrangement relationship of the outgoing points in each group may also select a corresponding relay according to the requirements.
Preferably, the electromagnetic relay is a multi-pole relay, and the number of output poles of the multi-pole relay is larger than 1, such as a double-pole double-throw relay, a double-pole single-throw relay and a multi-pole multi-throw relay. As shown in fig. 5, as an implementation manner of this embodiment, there are more than two sets of output contacts, for example, the output contacts are 020 and 030, one set of contacts 020 is used as a dry contact to form a dry contact output branch (an output voltage acquisition circuit formed between 042 and 044), and the other set of contacts 030 is connected to an input signal control circuit to form a detection readback branch. Specifically, the sense read-back leg includes a resistive element 050 disposed between a first contact of the other set of contacts (contacts below the second set of output contacts 030 in fig. 5) and ground, and a power source disposed in connection with a second contact of the other set of contacts (contacts above the second set of output contacts 030 in fig. 5); and the input signal control circuit obtains relay status information from the other set of contacts at the first contact (the contact below the second set of output contacts 030 in fig. 5).
As shown in fig. 7, a preferred double pole double throw relay K7 in the present embodiment, and fig. 8 is a simplified schematic diagram of the double pole double throw relay K7; the number 2, 3 and 4 of the double-pole double-throw relay K7 are a group of contacts to form a self-diagnosis detection circuit, and the number 5, 6 and 7 of the double-pole double-throw relay K7 are a group of contacts to form an output branch; the numbers 1, 8 are the input terminals of the circuit.
Further preferably, the output terminals of the detection readback branch (the terminals respectively connected with the digital numbers 2, 3 and 4, namely, the upper left corner in fig. 7) are fixedly arranged on the digital quantity output channel self-diagnosis detection circuit board; therefore, besides the relay, a readback detection circuit can be formed by only simple circuit components; and the detection signal is convenient to transmit stably in real time.
It should be noted that fig. 5 and fig. 7 are only partial schematic diagrams of the detection circuit in this embodiment, the number of poles and the number of throws in the circuit can be selected according to actual requirements, and other electrical elements, such as a resistor, a capacitor or an inductor, to be configured in the detection circuit can also be selected according to actual requirements; and for the different circuit parts in fig. 5 and 7, the selection can still be made according to actual requirements; these further variants fall within the scope of the invention.
Preferably, the electromagnetic relay provided in this embodiment has two sets of output contacts arranged in a completely electrically isolated state inside the electromagnetic relay. Specifically: the armature in the relay is composed of a non-conductive substance (e.g. insulating plastic) and the connecting circuit between the two sets of output contacts and the coil in the electromagnetic relay is also provided with a non-conductive substance outside.
More specifically, as shown in fig. 9, after the input side 310 of the electromagnet inputs an electrical signal, the coil attracts the armature in response to the electrical signal and triggers the output side moving contact 326 to attract, so that a first output formed by the output sides 331 and 332 forms a loop, and a second output formed by the output sides 333 and 334 forms a loop. The armature in the relay is composed of non-conductive substances, and the output branches between the output sides 331, 332, 333, 334 and the moving contact 326 are all wrapped by the non-conductive substances (such as external paint or wrapping insulating plastic), so as to form independent isolated output.
It should be noted that fig. 9 is only a simplified schematic diagram, and when the number of poles and the number of throws in the relay selected by those skilled in the art are different, the moving contact 326 and the circuit on the output side in fig. 9 are also different, but the variation of these number choices is still within the protection scope of the present invention.
Therefore, the embodiment uses the isolation circuit inside the multi-knife relay to realize the detection circuit, and the isolation circuit is not required to be arranged independently.
As shown in fig. 6, in another aspect, the present embodiment further provides a digital output channel self-diagnosis detection apparatus, which includes:
an input signal control circuit 210 for receiving a control signal of the digital quantity output;
an output signal control circuit 230 for outputting a control signal to the controlled operation circuit;
and a digital quantity output channel self-diagnosis detection circuit 220 connected to the data digital signal output channel, the self-diagnosis detection circuit being the digital quantity output channel self-diagnosis detection circuit explained in fig. 5.
It should be noted that, in the digital quantity output channel self-diagnosis detecting apparatus provided in this embodiment, a plurality of digital quantity output channel self-diagnosis detecting circuits may be provided corresponding to the number of digital quantity output channels.
As shown in fig. 10, the present embodiment further provides a digital output channel self-diagnosis detection method, where the digital output channel is connected to the digital output channel self-diagnosis detection device, and the method includes:
s100, powering on a digital quantity output channel self-diagnosis detection device;
s200, outputting a digital quantity control signal by the digital quantity output channel, namely inputting the control signal to the input signal control circuit, so that the self-diagnosis detection circuit enters a working state;
s300, the relay of the self-diagnosis detection circuit works, namely an electromagnetic relay coil in the self-diagnosis circuit receives a low-voltage power supply and keeps a contact in the relay in an on state;
s400, acquiring signals from the detection readback branch, and judging whether a data channel is good or not based on the output signals of the detection readback branch; namely, whether the read-back branch in the digital quantity output channel self-diagnosis detection circuit shown in the figure 5 can read a preset voltage and/or current value or whether the read-back branch has an electric signal is detected to judge whether the data channel is good or not.
By adopting the technical scheme provided by the embodiment of the invention, at least one of the following beneficial effects can be obtained:
1. two groups of branches are respectively connected to two groups of contacts connected with the relay, one group of contacts is used for inquiring the output voltage of the dry contact, the other group of contacts form a detection readback branch, and whether the data channel is good or not is judged based on the output signal of the detection readback branch; therefore, the method can be applied to both wet-junction and dry-junction digital quantity output self-diagnosis.
2. Two groups of branches are respectively connected to two groups of contacts connected with the relay, and other extra circuits are not needed to be additionally arranged, so that the design of the self-diagnosis circuit of the digital quantity output channel can be simplified.
The two paths of output contacts of the relay are directly distributed to be mutually isolated, so that the isolation of the output of the digital quantity channel and the output control circuit can be realized.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any person skilled in the art can make many possible variations and simple substitutions to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the scope of the technical solution of the present invention, and these all fall into the scope of protection of the technical solution of the present invention.
Claims (10)
1. A digital quantity output channel self-diagnostic detection circuit, the detection circuit comprising:
the input end of the electromagnetic relay is arranged to receive a digital control signal from a processor of the DCS, pass through the electromagnetic relay and output an electric signal converted by the electromagnet to an external circuit; after the input side of the electromagnet inputs an electric signal, the coil responds to the electric signal, attracts the armature and triggers the movable contact on the output side to attract, so that a first path of output formed by the output side of the electromagnet forms a loop, and a second path of output formed by the output side forms a loop;
the electromagnetic relay comprises two groups of output contacts, wherein one group of contacts is used as a dry contact to form a dry contact output branch, and the other group of contacts is connected to an input signal control circuit to form a detection readback branch;
the electromagnetic relay coil in the self-diagnosis detection circuit receives a low-voltage power supply, contacts in the relay are kept in an on state, signals are obtained from a detection readback branch, two groups of branches are respectively connected to two groups of contacts connected with the relay, one group of contacts is used for inquiring the output voltage of a dry contact, the other group of contacts form the detection readback branch, and whether the digital quantity output channel is good or not is judged based on the output signals of the detection readback branch.
2. The detection circuit according to claim 1, wherein the electromagnetic relay is a multi-pole relay provided with two sets of output contacts, one set of contacts forming a dry contact output branch as a dry contact, the other set of contacts being connected to the input signal control circuit to form a detection readback branch.
3. The sensing circuit of claim 2, wherein the sense read-back leg further comprises a resistive element disposed between a first contact of the other set of contacts and ground, and a power source disposed in connection with a second contact of the other set of contacts; and the input signal control circuit obtains the relay status information from a first contact of the other set of contacts.
4. The detection circuit of claim 2, wherein the multi-pole relay is a double-pole double-throw relay.
5. The detection circuit of claim 1, wherein the output terminal of the detection readback branch is fixedly disposed on the digital quantity output channel self-diagnostic detection circuit board.
6. The detection circuit according to any one of claims 1 to 5, wherein two sets of output contacts in the electromagnetic relay are laid out in a completely electrically isolated state inside the electromagnetic relay.
7. The detection circuit of claim 6, wherein the armature in the relay is comprised of a non-conductive substance, and wherein the connection circuit between the two sets of output contacts in the electromagnetic relay and the coil is also provided with a non-conductive substance externally.
8. A digital quantity output channel self-diagnostic test device, the test device comprising:
an input signal control circuit for receiving a control signal of the digital quantity output;
an output signal control circuit for outputting a control signal to the controlled operation circuit;
and a digital quantity output channel self-diagnosis detection circuit connected with the digital quantity output channel, wherein the self-diagnosis detection circuit is any one of the circuits in claims 1-7.
9. The detecting device according to claim 8, wherein during operation of the detecting device, the detecting circuit reads in real time whether the detecting read-back branch meets a predetermined requirement, and outputs a signal whether the digital quantity output channel is good based on the signal output by the detecting read-back branch.
10. A digital quantity output channel self-diagnosis detection method, characterized in that the digital quantity output channel is connected to the digital quantity output channel self-diagnosis detection apparatus according to claim 8, the detection method comprising:
powering up the digital quantity output channel self-diagnosis detection device, so that the digital quantity output channel self-diagnosis detection device outputs signals;
and acquiring the signal from the detection readback branch, and judging whether the digital quantity output channel is good or not based on the output signal of the detection readback branch.
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| CN108089567B (en) * | 2017-12-11 | 2019-12-10 | 成都运达科技股份有限公司 | Semiconductor dry-wet contact fault diagnosis circuit and diagnosis method |
| CN110007663A (en) * | 2019-05-14 | 2019-07-12 | 中国核动力研究设计院 | The output switch parameter dynamic diagnostics system and method for nuclear safe level DCS |
| CN111650856A (en) * | 2020-05-19 | 2020-09-11 | 上海有个机器人有限公司 | Control circuit and device for dry contact output |
| CN113805518B (en) * | 2021-11-19 | 2022-03-08 | 华智生物技术有限公司 | Fault protection system and method for digital agriculture execution terminal |
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| CN104865958A (en) * | 2015-05-04 | 2015-08-26 | 株洲南车时代电气股份有限公司 | Matrix switch device, system and method |
| CN204945665U (en) * | 2015-06-29 | 2016-01-06 | 瑞斯康达科技发展股份有限公司 | A kind of on-off model harvester |
| CN105067874A (en) * | 2015-07-29 | 2015-11-18 | 国核自仪系统工程有限公司 | Switching output self-diagnosis circuit |
| CN106292633A (en) * | 2016-08-25 | 2017-01-04 | 北京广利核系统工程有限公司 | A kind of digital output passage self-checking system based on FPGA and method |
| CN207051731U (en) * | 2017-05-31 | 2018-02-27 | 北京广利核系统工程有限公司 | Digital output passage self diagnosis detection means |
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