CN115113612B - Nuclear power plant DCS system redundancy switching value output diagnosis system and diagnosis method - Google Patents
Nuclear power plant DCS system redundancy switching value output diagnosis system and diagnosis method Download PDFInfo
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- G—PHYSICS
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- 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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- 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
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a redundant switching value output diagnosis system and a diagnosis method of a nuclear power plant DCS system.A first switching value output module and a second switching value output module are respectively connected with one of an odd slot position module and an even slot position module, and the first switching value output module and the second switching value output module are connected in parallel through backboard communication; the first switching value output module and the second switching value output module are used for static diagnosis under the condition of independent operation, and the static diagnosis is used for judging whether communication in each module fails or not; when the first switching value output module and the second switching value output module are used as redundancy modules for output, the dynamic diagnosis is carried out through a polling mark, and the dynamic diagnosis is used for judging whether the switching value output module is controllable or not; the invention has the beneficial effects of realizing high reliability and accuracy control of the redundant switching value output signal, ensuring the safety of the system and improving the stability and safety of the diagnosis system.
Description
Technical Field
The invention relates to the technical field of redundant switching value output systems, in particular to a diagnostic system and a diagnostic method for redundant switching value output of a DCS (distributed control system) system of a nuclear power plant.
Background
In the field of industrial control, especially in the field of digital instrument control of nuclear power plants, there are cases where a large number of switching value signals are output to drive special design, participate in shutdown logic voting, participate in priority logic input logic and the like. The nuclear power field is a field with particularly high requirements on safety and reliability, so that the redundant switching value output system must ensure high safety and high reliability of driving equipment thereof.
In the prior art, only a single switching value output diagnosis module is provided, and when the single switching value output diagnosis module has faults, the output of a switching value signal cannot be controlled, so that great loss is caused.
In view of this, the present application has been made.
Disclosure of Invention
The invention aims to solve the technical problems that in the prior art, a single switching value output diagnosis module is adopted, and when faults occur, the output of switching value signals cannot be controlled, so that great loss is caused.
The invention is realized by the following technical scheme:
The redundant switching value output diagnosis system of the DCS system of the nuclear power plant comprises a case, a first switching value output module and a second switching value output module, wherein an odd slot position module and an even slot position module are arranged on the case, the first switching value output module and the second switching value output module are respectively connected with one of the odd slot position module and the even slot position module, and the first switching value output module and the second switching value output module are connected in parallel through backboard communication; the first switching value output module and the second switching value output module are in redundancy control;
The first switching value output module and the second switching value output module are used for static diagnosis under the condition of independent work, and the static diagnosis is used for judging whether communication in each module fails or not;
When the first switching value output module and the second switching value output module are used as redundant modules for output, dynamic diagnosis is carried out through a polling mark, and the dynamic diagnosis is used for judging whether the switching value output module is controllable or not.
Preferably, when the first switching value output module and the second switching value output module are output as redundancy modules, the odd slot position module is used for generating a polling mark for dynamic diagnosis and transmitting the polling mark to the even slot position module;
The even slot position module is used for judging the level of the polling mark and carrying out dynamic diagnosis on the corresponding switching value output module according to a judging result:
when the polling mark is at a high level, the switching value output module on the odd slot position module performs dynamic diagnosis;
And when the polling mark is in a low level, the switching value output module on the even slot position module performs dynamic diagnosis.
Preferably, the first switching value output module comprises a processing unit, a switching value output unit and a diagnosis readback unit;
The processing unit is used for outputting a driving control signal to the switching value output unit;
The switching value output unit is used for generating a corresponding channel readback signal under the action of the driving control signal;
the diagnosis readback unit is used for detecting the channel readback signal and transmitting the channel readback signal to the processing unit;
And the processing unit is also used for carrying out static diagnosis on the switching value output unit based on the driving control signal and the channel readback signal.
Preferably, the switching value output unit includes a first relay and a second relay, the first relay and the second relay are connected in series, the processing unit inputs the driving control signal into the first relay and the second relay, respectively, and the diagnosis readback unit is used for readback channel readback signals output by the first relay and the second relay;
the first relay is used for outputting the data state of the switching value output unit;
The second relay is used for static diagnosis.
Preferably, in the processing unit, the static diagnosis is specifically performed as follows: and when the driving control signal is consistent with the channel readback signal, the channel of the switching value output unit works normally, otherwise, the channel in the switching value output unit fails.
Preferably, in the first switching value output module or the second switching value output module, when the respective modules operate independently, static diagnosis is performed at periodic time or when a switching value of the switching value output changes.
Preferably, the second switching value output module is disposed equivalent to the first switching value output module.
The invention discloses a diagnosis method for redundant switching value output of a DCS system of a nuclear power plant, which is realized on the diagnosis system according to any one of claims 3 to 7, and comprises the following steps:
S1: acquiring first data and second data, wherein the first data is state data of the first switching value output module, and the second data is state data of the second switching value output module;
s2: judging whether the first data and the second data have fault data or not, and if the first data and the second data have no fault data, executing the step S3;
S3: reading the identification number of the odd slot position module and the identification number of the even slot position module, and generating a polling mark position according to the read identification numbers;
S4: and based on the polling mark, sequentially carrying out dynamic diagnosis on the odd slot position module and the even slot position module, and outputting diagnosis results of the first switching value output module and the second switching value output module after the dynamic diagnosis of the even slot position module is completed.
Preferably, the method steps further comprise: performing a static diagnosis on the first switching value output module, wherein the sub-steps of the method for static diagnosis comprise:
Outputting a driving control signal to the switching value output unit;
detecting an action signal generated by the switching value output unit;
and judging whether the action signal is consistent with the driving control signal or not, and determining whether a channel fails or not.
Preferably, the first data includes status data of each unit in the module, a diagnosis status of an output channel in the module, a quality status of the output data in the module, and output data of the module; the second data is identical to the first data.
Compared with the prior art, the invention has the following advantages and beneficial effects:
According to the system and the method for diagnosing the redundant switching value output of the DCS system of the nuclear power plant, provided by the embodiment of the invention, the static diagnosis and the dynamic diagnosis are combined by adopting the mode of the redundant switching value output module, so that the high reliability and the accuracy control of the redundant switching value output signal are realized, the safety of the system is ensured, and the stability and the safety of the diagnostic system are improved.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a diagnostic system
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: no such specific details are necessary to practice the invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail in order not to obscure the invention.
Throughout the specification, references to "one embodiment," "an embodiment," "one example," or "an example" mean: a particular feature, structure, or characteristic described in connection with the embodiment or example is included within at least one embodiment of the invention. Thus, the appearances of the phrases "in one embodiment," "in an example," or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Moreover, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and that the illustrations are not necessarily drawn to scale. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention.
Example 1
The embodiment discloses a redundant switching value output diagnosis system of a nuclear power plant DCS system, which can output a large number of switching value signals to drive special equipment, participate in shutdown logic voting, participate in priority logic input logic and the like in the field of industrial control, particularly in the field of digital instrument control of the nuclear power plant. The nuclear power field is a field with particularly high requirements on safety and reliability, so that the redundant switching value output system must ensure high safety and high reliability of driving equipment thereof. In the prior art, only a single switching value output diagnosis module is provided, when the single switching value output module fails, the output of a switching value signal cannot be controlled, and the damage is large; in the system disclosed by the embodiment, by arranging the redundant switching value output module and combining static diagnosis with dynamic diagnosis, the high reliability and accuracy control of the redundant switching value output signal are realized, the safety of the system is ensured, and the stability and safety of the diagnosis system are improved.
The diagnostic system is shown in fig. 1, and the switching value output module a corresponds to the first switching value output module of the embodiment and is inserted into an odd slot position module on the chassis; the switching value output module B corresponds to the second switching value output module of this embodiment, and is inserted into an even slot module on the chassis, where the two modules are redundant modules, specifically: the switching value output device comprises a case, a first switching value output module and a second switching value output module, wherein the first switching value output module and the second switching value output module are respectively connected with one of the odd slot position module and the even slot position module, and the first switching value output module and the second switching value output module are connected in parallel through backboard communication; the first switching value output module and the second switching value output module are in redundancy control;
The first switching value output module and the second switching value output module are used for static diagnosis under the condition of independent work, and the static diagnosis is used for judging whether communication in each module fails or not;
In this embodiment, in the first switching value output module and the second switching value output module, when each module independently works, static diagnosis can be performed in each module, and when static diagnosis is performed, static diagnosis is performed according to periodic interval time or when a switching value of switching value output changes, so as to determine whether internal channels of each module are in normal communication.
Specific static diagnostics are: the switching value output module drives the relay to output to be closed or opened through the FPGA-IO port. The channel readback diagnosis is read back to the FPGA_IO port through the integrated DC/DC isolator. The FPGA judges whether the output driving control signal is consistent with the diagnosis readback signal, determines whether the channel is faulty, normally feeds back '0' to the channel, feeds back '1' to the channel fault, and the processing unit reads the channel diagnosis information through the bus to finish channel output and diagnosis fault information reporting.
The static diagnosis of the single switching value output signal is performed every 10ms or when the output switching value is changed, if the redundancy module performs the inter-cutting operation on the module, the dynamic diagnosis operation is not performed. When static diagnosis is carried out, the module informs the dynamic diagnosis module of the static diagnosis working state through back plate communication, and meanwhile, the dynamic diagnosis module needs to select an output signal as data output of the static diagnosis module. When the board card safety type is configured to be power-on safety, the default switch output is in an open state, and when the board card safety type is configured to be power-off safety, the default switch output is in a closed state.
For the output of the switching value output signal, during normal output, the module output channel relay keeps an output state all the time, and static diagnosis cannot judge whether the switching value output contact is controllable or not when the switching value output signal is wanted to be turned over in the next period, so that a dynamic diagnosis method of redundant switching value output signals is continuously introduced. The dynamic diagnosis can judge whether the switching value output signal can be output according to the expected or not in advance, if not, the channel fault is reported, the system enters a safe state in advance, and the safety and the reliability of the system are improved.
When the first switching value output module and the second switching value output module are used as redundant modules for output, dynamic diagnosis is carried out through a polling mark, and the dynamic diagnosis is used for judging whether the switching value output module is controllable or not. In this embodiment, the modules that are redundant are used to generate dynamic diagnostics, and the sequence of generating dynamic diagnostics is implemented by the odd slot modules and the even slot modules on the chassis backplane.
When the first switching value output module and the second switching value output module are used as redundant modules for output, the odd slot position module is used for generating a polling mark for dynamic diagnosis and transmitting the polling mark to the even slot position module;
the even slot position module is used for judging the level of the polling mark and carrying out dynamic diagnosis on the corresponding switching value output module according to a judging result: when the polling mark is at a high level, the switching value output module on the odd slot position module performs dynamic diagnosis; and when the polling mark is in a low level, the switching value output module on the even slot position module performs dynamic diagnosis.
The method comprises the following steps: the switch output of the redundant switch output can determine the final switch output value of the module after logic processing according to the self state of the module and the state of the redundant module, and whether to allow dynamic diagnosis is determined according to the output switch value of the module, the switch output value of the redundant module, a polling mark and the like during dynamic diagnosis.
The redundant switching value output module receives the state data sent to the module by the redundant module in real time through the backboard communication interface, and simultaneously sends the state data of the module to the redundant module to send and receive data content: the module state (processing unit state, communication state, blocking state), the output channel diagnosis state, the output data quality bit, and the output data (output data issued by the master).
The module determines whether to allow dynamic diagnosis according to the state of the DO modules, the communication state between the DO modules, the quality bit, the mutual switching, the locking, the channel state, the output switch state, the communication state between the DO modules, the redundancy module in-place state and the like, and sets a dynamic diagnosis mark. The dynamic diagnosis processing mode of the redundant switching value output module is shown in table 1.
Table 1 redundant switching value output module dynamic diagnosis processing mode
In addition, considering that 2 redundant switching value output modules exist in the redundant switching value output modules in the embodiment, in order that 2 redundant switching value output modules can perform orderly dynamic diagnosis, the embodiment is further provided with a redundant switching value output dynamic diagnosis priority, and the specific implementation mode is as follows: the odd slot position module generates a dynamic diagnosis polling flag, the even slot position module reads a polling flag, the polling flag is used for dynamic diagnosis by the high-level Shi Ji slot position module, and the even slot position module is used for dynamic diagnosis when the polling flag is low.
During specific diagnosis, the output data selection channel is selected as the output data of the dynamic diagnosis module, the states of two switches of the output channel are controlled through a state machine, the conversion sequence is 11-10-01-00-11, finally, the output data is returned to 11, and the original output state is recovered; and judging whether the output is normal or not according to the readback data of the switch. The decision logic is shown in table 2.
TABLE 2 dynamic diagnostic switch diagnostic logic truth table
When the dynamic diagnosis is carried out, the switch output value is required to be selected as the switch data output of the dynamic diagnosis module, if the static diagnosis module is detected to need to output data, the dynamic diagnosis module stops carrying out the dynamic diagnosis, and the dynamic diagnosis can be carried out after the static diagnosis is finished, and the period of the dynamic diagnosis can be configured by software.
In this embodiment, as shown in fig. 1, a specifically configured circuit, a first switching value output module is configured to include a processing unit, a switching value output unit, and a diagnostic readback unit;
The processing unit is realized based on ARM+FPGA and is used for outputting a driving control signal to the switching value output unit;
The single switching value output module output unit comprises two Photo Mos relays which are connected in series for output, one is an output switch, and the other is a diagnostic switch, and the single switching value output module output unit is used for generating corresponding channel readback signals under the action of the driving control signals;
Under normal conditions, the switch is in a closed state, and when in a fault or safety state, in order to prevent the single switch from being unable to be opened due to adhesion, a mode of connecting a plurality of switches in series is provided, so that the phenomenon of false output caused by the fault of the single switch is avoided.
The diagnosis readback unit adopts a double-channel isolator integrated with a DC/DC converter and is used for detecting the channel readback signal and transmitting the channel readback signal to the processing unit;
And the processing unit is also used for carrying out static diagnosis on the switching value output unit based on the driving control signal and the channel readback signal.
The switching value output unit comprises a first relay and a second relay, the first relay and the second relay are connected in series, the processing unit inputs the driving control signals into the first relay and the second relay respectively, and the diagnosis readback unit is used for readback channel readback signals output by the first relay and the second relay;
the first relay is used for outputting the data state of the switching value output unit;
The second relay is used for static diagnosis.
In the processing unit, the static diagnosis is specifically: and when the driving control signal is consistent with the channel readback signal, the channel of the switching value output unit works normally, otherwise, the channel in the switching value output unit fails.
The second switching value output module is arranged equivalent to the first switching value output module.
The embodiment discloses a redundant switching value output diagnosis system of a nuclear power plant DCS system, which ensures the high diagnosis coverage of a single module, simultaneously monitors the relevant fault state of the redundant module in real time in a normal working state, and realizes the high reliability and accuracy control of the redundant switching value output signal by adopting a mode of combining dynamic diagnosis and static diagnosis, thereby ensuring the safety of the system.
Example two
The embodiment discloses a diagnosis method for redundant switching value output of a DCS system of a nuclear power plant, which is implemented on the system set in the first embodiment, and comprises the following steps:
S1: acquiring first data and second data, wherein the first data is state data of the first switching value output module, and the second data is state data of the second switching value output module;
The first data comprise state data of each unit in the module, a diagnosis state of an output channel in the module, a quality state of the output data in the module and output data of the module; the second data is identical to the first data.
In this embodiment, the set data is specifically that the redundancy switch value output module receives, in real time, the state data sent by the redundancy module to the module through the back board communication interface, and sends the state data of the module to the redundancy module, so as to receive and send data contents: the module state (processing unit state, communication state, blocking state), the output channel diagnosis state, the output data quality bit, and the output data (output data issued by the master).
The module determines whether to allow dynamic diagnosis according to the state of the DO modules, the communication state between the DO modules, the quality bit, the mutual switching, the locking, the channel state, the output switch state, the communication state between the DO modules, the redundancy module in-place state and the like, and sets a dynamic diagnosis mark.
S2: judging whether the first data and the second data have fault data or not, and if the first data and the second data have no fault data, executing the step S3;
S3: reading the identification number of the odd slot position module and the identification number of the even slot position module, and generating a polling mark position according to the read identification numbers;
S4: and based on the polling mark, sequentially carrying out dynamic diagnosis on the odd slot position module and the even slot position module, and outputting diagnosis results of the first switching value output module and the second switching value output module after the dynamic diagnosis of the even slot position module is completed.
The method steps further include: performing a static diagnosis on the first switching value output module, wherein the sub-steps of the method for static diagnosis comprise: outputting a driving control signal to the switching value output unit; detecting an action signal generated by the switching value output unit; and judging whether the action signal is consistent with the driving control signal or not, and determining whether a channel fails or not.
The specific flow method comprises the following steps: after the redundant switching value output module is powered on and initialized to be successfully started to operate, the module receives the state data sent to the module by the redundant module through the backboard communication bus, and simultaneously sends the state data of the module to the redundant module to send and receive data content: module status (ARM status, communication status, latch status), output channel diagnostic status, output data quality bits, output data.
And confirming that the state data has no faults, generating a module dynamic training marker bit according to the odd/even slot identification number of the backboard, and starting dynamic diagnosis when the dynamic diagnosis time counter is full of diagnosis time and the redundant switching value is output.
The diagnosis method for the redundant switching value output of the DCS system of the nuclear power plant can rapidly diagnose the switching value output link, meanwhile, the channel diagnosis and the channel output function can be completed within one period, the real-time performance of diagnosis and the reliability of data output are achieved, and a switching value output circuit with high diagnosis coverage rate is designed.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (9)
1. The redundant switching value output diagnosis system of the DCS system of the nuclear power plant is characterized by comprising a case, a first switching value output module and a second switching value output module, wherein an odd slot position module and an even slot position module are arranged on the case, the first switching value output module and the second switching value output module are respectively connected with one of the odd slot position module and the even slot position module, and the first switching value output module and the second switching value output module are connected in parallel through backboard communication; the first switching value output module and the second switching value output module are in redundancy control;
The first switching value output module and the second switching value output module are used for static diagnosis under the condition of independent work, and the static diagnosis is used for judging whether communication in each module fails or not;
When the first switching value output module and the second switching value output module are used as redundant modules for output, dynamic diagnosis is carried out through a polling mark, and the dynamic diagnosis is used for judging whether the switching value output module is controllable or not;
When the first switching value output module and the second switching value output module are used as redundant modules to output, the odd slot position module is used for generating a polling mark for dynamic diagnosis and transmitting the polling mark to the even slot position module;
The even slot position module is used for judging the level of the polling mark and carrying out dynamic diagnosis on the corresponding switching value output module according to a judging result:
when the polling mark is at a high level, the switching value output module on the odd slot position module performs dynamic diagnosis;
And when the polling mark is in a low level, the switching value output module on the even slot position module performs dynamic diagnosis.
2. The system of claim 1, wherein the first switching value output module comprises a processing unit, a switching value output unit and a diagnosis readback unit;
The processing unit is used for outputting a driving control signal to the switching value output unit;
The switching value output unit is used for generating a corresponding channel readback signal under the action of the driving control signal;
the diagnosis readback unit is used for detecting the channel readback signal and transmitting the channel readback signal to the processing unit;
And the processing unit is also used for carrying out static diagnosis on the switching value output unit based on the driving control signal and the channel readback signal.
3. The redundant switching value output diagnostic system of a DCS system of a nuclear power plant according to claim 2, wherein the switching value output unit comprises a first relay and a second relay connected in series, the processing unit inputs the driving control signal to the first relay and the second relay, respectively, and the diagnostic read-back unit reads back the channel read-back signals outputted from the first relay and the second relay;
the first relay is used for outputting the data state of the switching value output unit;
The second relay is used for static diagnosis.
4. A redundant switching value output diagnostic system for a DCS system of a nuclear power plant according to claim 3, wherein the processing unit performs a static diagnosis of: and when the driving control signal is consistent with the channel readback signal, the channel of the switching value output unit works normally, otherwise, the channel in the switching value output unit fails.
5. The system according to claim 4, wherein the first switching value output module or the second switching value output module performs static diagnosis at a periodic time or when a switching value of the switching value output is changed when the respective modules are operated independently.
6. The redundant switching value output diagnostic system of a nuclear power plant DCS system of claim 5, wherein said second switching value output module is provided identically to said first switching value output module.
7. The diagnosis method for the redundant switching value output of the DCS system of the nuclear power plant is characterized by being implemented on the diagnosis system as claimed in any one of claims 3-6, and comprises the following steps:
S1: acquiring first data and second data, wherein the first data is state data of the first switching value output module, and the second data is state data of the second switching value output module;
s2: judging whether the first data and the second data have fault data or not, and if the first data and the second data have no fault data, executing the step S3;
S3: reading the identification number of the odd slot position module and the identification number of the even slot position module, and generating a polling mark position according to the read identification numbers;
S4: and based on the polling mark, sequentially carrying out dynamic diagnosis on the odd slot position module and the even slot position module, and outputting diagnosis results of the first switching value output module and the second switching value output module after the dynamic diagnosis of the even slot position module is completed.
8. The method for diagnosing redundant switching value output of a DCS system of a nuclear power plant according to claim 7, further comprising, before step S1: performing a static diagnosis on the first switching value output module, wherein the sub-steps of the method for static diagnosis comprise:
Outputting a driving control signal to the switching value output unit;
detecting an action signal generated by the switching value output unit;
and judging whether the action signal is consistent with the driving control signal or not, and determining whether a channel fails or not.
9. The method for diagnosing redundant switching value output of a DCS system of a nuclear power plant according to claim 7, wherein,
The first data comprise state data of each unit in a module of the first switching value output module, a diagnosis state of an output channel in the module, a quality state of output data in the module and output data of the module;
The second data includes state data of each unit in the module of the second switching value output module, a diagnosis state of the output channel in the module, a quality state of the output data in the module and the output data of the module.
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