A multifunctional input monitor module for nuclear power plants

Abstract

The invention relates to a multifunctional input monitor module for a nuclear power plant, comprising an analog input AI channel, an analog output AO channel and a switch output DO channel. After a sensor signal is input to the monitor module, it is separated from AC and DC by a buffer circuit; the DC signal is attenuated, and the AC signal is amplified by a process control amplifier and then input to an analog-to-digital AD converter, and AD conversion is performed under the synchronization of a key phase signal; the data is converted into engineering quantities after being processed by a CPU, and the CPU is respectively connected to the analog output AO channel, the switch output DO channel and a network communication circuit; the recording output of four independent channels and the alarm switch output of eight independent channels can be freely combined across channels, and the switch output of a protection action can be combined and outputted with complex logic across modules; the invention simplifies the complex structure of a TSI instrument, reduces the number of spare parts, reduces the user's use cost, and improves the safety and reliability of the TSI instrument.

Description

[Technical field]

[0001] The invention belongs to the technical field of steam turbine monitoring and protection instruments, in particular to a multifunctional input monitor module for a nuclear power plant. [Background Technology]

[0002] The general description of turbine supervisory instruments (TSI instruments) is as follows:

[0003] A large number of large rotating machinery are used in nuclear power plants, such as steam turbine generator sets, pump shaft pump system, etc. In addition to steam turbine generator sets, TSI instruments can also be used in pump shaft pump system, which can be extended to the monitoring and protection of rotating machinery. It is one of the key equipment to ensure the safe operation of rotating machinery. At present, in order to ensure the safe operation of nuclear power plants, all rotating machinery in nuclear power plants must be installed with TSI instruments in accordance with the operating procedures of nuclear power plants, including main equipment such as steam turbine generator sets, large pump shaft pump units, and auxiliary equipment such as fans and circulation systems. TSI instruments need to monitor and protect many parameter signals, and commonly used measurement parameters include: vibration (including bearing vibration, relative vibration, shaft vibration), axial displacement, expansion difference, eccentricity, speed, zero speed, key phase, cylinder expansion, oil motor stroke, synchronizer stroke, etc. Since the measurement parameters are different, the measurement principles are different, resulting in completely different non-electrical quantity conversion and electrical signal processing methods. Therefore, the solutions adopted by various TSI instrument manufacturers currently provide various types of monitor measurement modules, such as vibration monitors, axial displacement monitors, differential expansion monitors, eccentricity monitors, speed monitors, zero speed monitors, key phase monitors, cylinder expansion monitors, stroke monitors, etc., which respectively monitor and protect vibration (including bearing vibration, relative vibration, shaft vibration), axial displacement, differential expansion, eccentricity, speed, zero speed, key phase, cylinder expansion, oil motor stroke, synchronizer stroke and other measurement parameters. More than 10 monitor modules (varieties) are involved, and each variety has many specifications due to differences in measurement range, installation method, relay logic combination, etc. Various varieties and specifications make the entire TSI instrument structure quite complex. When users use it, there are many varieties and specifications of spare parts, resulting in high costs.

[0004] At present, the nuclear power plants in my country basically use imported TSI products, and the international brands used more often are: American Bentley (BN), German ERPO, Japanese Shinkawa, Swiss Vibro-Meter, etc. Despite this, the monitor modules of imported products are still of many varieties, but with relatively few specifications. Through software configuration, the purpose of reducing specifications has been achieved, but there are still many varieties of spare parts.

[0005] To this end, if it is possible to integrate multiple measurement parameter monitoring and protection functions into one monitor module, the parameter signal type of the channel can be set through software, and various setting parameters can automatically adapt according to the parameter type; and provide overspeed protection and relay output with complex logic design between modules, it will be of great significance. [Summary of the invention]

[0006] The purpose of the present invention is to solve the above-mentioned deficiencies and provide a multifunctional input monitor module for a nuclear power plant. By integrating multiple measurement parameter monitoring and protection functions into one monitor module, the complex structure of the TSI instrument is simplified, the number of spare parts is reduced, the user's use cost is reduced, and the safety and reliability of the TSI instrument are improved.

[0007] In order to achieve the above-mentioned purpose, a multifunctional input monitor module of a nuclear power plant is designed, comprising an analog input AI channel, an analog output AO channel, a switch output DO channel and a network communication circuit, wherein, for the analog input AI channel, after the sensor signal input is sent to the monitor module, it is separated from the AC and DC by a buffer circuit; the DC signal is attenuated, and the AC signal is amplified by a process control amplifier and then input to an analog-to-digital AD converter, and AD conversion is performed under the synchronization of a key phase signal; the data is processed by a central processing unit CPU and converted into an engineering quantity, and the central processing unit CPU is respectively connected to the analog output AO channel, the switch output DO channel and the network communication circuit; for the analog output AO channel, the digital quantity sent by the central processing unit CPU is converted into an analog-to-digital quantity by a digital-to-analog converter DAC, amplified, impedance matched, and converted into a record output; for the switch output DO channel, the digital quantity sent by the central processing unit CPU is output as a switch signal by a relay, and the corresponding relationship between the switch output and the analog input AI channel is freely configured or a complex logic combination output is performed across modules; the network communication circuit provides one RS485 interface and two CAN bus interfaces.

[0008] Furthermore, the sensor signal is connected to the monitor analog input AI channel. According to the type of sensor connected, the CNC electronic switch is controlled by the switch logic to provide the sensor with the required +24VDC power supply, -24VDC power supply, two-wire active signal input or two-wire passive signal input.

[0009] Preferably, the sensor signal is connected to the sensor type 201. According to the connected sensor type, the switch logic 202 controls the CNC electronic switch 203, so that the power output 204 determines whether the power supply sent to the sensor is +24VDC, -24VDC, or sent out by the two-wire signal input 205, and in the sensor input terminal wiring method 206, the terminal SGN is connected to the input signal, the terminal COM is connected to the signal common line, and the terminal POW is connected to the sensor power supply.

[0010] Preferably, the analog signal input by the sensor is amplified by the programmable amplifier 301, which determines the amplifier ratio according to the channel configuration and standardizes the input signal to the applicable range of the AD converter 302. The AD converter 302 performs A / D conversion on the analog signal and converts the standardized analog signal into the original digital quantity and sends it to the data conversion and calculation 3. The data conversion and calculation 303 filters the original digital quantity, converts it into an engineering value according to the configuration content, checks the alarm status, and stores the value in the real-time database of the module. The real-time data communication 304 sends the content in the real-time database to the local communication configuration module and other monitor modules as the result output 305. According to the configuration content and real-time data, the record output and the switch working state are determined; the configuration data communication 306 receives the configuration information according to the command of the configuration software and stores it in the non-volatile medium of the monitor module, or sends the local configuration to the configuration software.

[0011] Furthermore, in the analog input AI channel, the sensor signal is connected from the sensor input terminal 101 and sent to the signal protection circuit 102. The signal protection circuit 102 limits the current and voltage of the input signal. The voltage limiting range of the external input signal is ±24V, and the current limiting range is 30mA. The output terminal of the signal protection circuit 102 is respectively connected to the signal following circuit 103 and the signal follower output 115. The output signal of the signal follower output 115 is connected to the DB9 interface signal output 116, and the DB9 interface signal output 116 is connected to the BNC interface output 117; the output terminal of the signal follower 103 is connected to the AC / DC separation circuit 104, and the signal is separated by AC / DC through the AC / DC separation circuit 104 and then divided into two paths for AC sampling and DC sampling respectively; the AC signal is sent to the program-controlled amplification circuit 106 through the AC sampling circuit 105 to adjust the signal to a suitable range, and then the signal is sampled by the AD sampling circuit 106. The conversion circuit 107 completes analog-to-digital conversion and converts the continuous analog signal into a digital signal. The output end of the AD conversion circuit 107 is connected to the digital filtering circuit 108. After the digital filtering circuit 108 performs digital filtering on the collected input signal, it is sent to the CPU at the vibration signal output 109; the DC signal is adjusted to a suitable signal through the DC sampling, program-controlled amplification circuit 110, and AD conversion circuit 2 111, and is sent to the CPU at the gap signal output 112; the CPU adaptively outputs a DC signal according to the size of the received AC and DC signals. After the bias signal input 113 and the DA conversion circuit 114, this signal is input to the DC signal program-controlled amplifier to control the amplifier's gain.

[0012] Preferably, in the analog input AI channel, the voltage range allowed for the DC component input is -24VDC~0~+24VD, configured as a single-channel measurement mode or a dual-channel combined measurement; the voltage range allowed for the AC component input is 4VPK-PK, the maximum signal value is 20VACrms, and the signal frequency range is 0-20KHz; the speed signal is obtained by calculation from the AC signal, and the detection calculation method can be selected as peak-to-peak measurement, zero-crossing measurement, and specified trigger point measurement; the field sensor is powered, and the input signal of the BNC output is output after following for use by other devices.

[0013] Furthermore, in the analog output AO channel, data isolation and power isolation are adopted between the CPU and the digital-to-analog converter. The analog output AO channel has four independent 4-20mA analog output AOs. The upper and lower limits, proportions, and hysteresis corresponding to the analog output AO are configurable, and the correspondence between the analog output and the analog input AI channel can be freely configured.

[0014] Preferably, in the switch output DO channel, the digital quantity sent by the CPU drives the sealed relay to output the switch signal through a large current Darlington tube, and adopts data isolation and power isolation to provide eight-way electromagnetic relay outputs. The eight-way relay dry contact output corresponds to which analog input AI channel, which is arbitrarily configured and selected by the software, or complex logic configuration output can be performed, and logical combination output can be executed across modules.

[0015] Furthermore, in the network communication circuit, RS485 communicates with the key phase & local configuration module to receive configuration information, using a dedicated protocol and a master-slave communication mode; CAN1 / 2 are hot standby and redundant communication modes, and real-time data is transmitted between modules, using a dedicated protocol, and a token communication mode and a trigger communication mode are in parallel.

[0016] Compared with the prior art, the present invention can integrate more than 10 measurement parameters of TSI instruments into a universal monitor module, adopt software setting, measurement parameter adaptation and other advanced computer technologies to complete the setting of measurement parameters and alarm parameter, and complete the multi-parameter measurement, online monitoring protection, recording output, protection action output and other functions of various TSI instruments. The recording output of 4 independent channels and the alarm switch output of 8 independent channels can be freely combined across channels, and the switch output of the protection action can be combined with the output of complex logic across modules, which simplifies the complex structure of the TSI instrument, reduces the number of spare parts, reduces the user's use cost, and improves the safety and reliability of the TSI instrument. In addition, the present invention integrates multiple measurement parameter monitoring and protection functions into one monitor module, the parameter signal type of the channel can be set by software, various setting parameters are automatically adapted according to the parameter type, and provides overspeed protection and relay output with complex logic design between modules, etc., which is worthy of promotion and application. [Drawings]

[0017] Figure 1 It is a schematic diagram of the monitoring module system flow of the present invention;

[0018] Figure 2 This is a schematic diagram of an analog quantity input module of the present invention;

[0019] Figure 3 A schematic diagram of power supply for the sensor of the present invention;

[0020] Figure 4 This is a schematic diagram of an analog output module of the present invention;

[0021] Figure 5 This is a schematic diagram of a switch output module of the present invention;

[0022] Figure 6 A schematic diagram of the software communication flow of the monitor module of the present invention;

[0023] In the figure: 101, sensor input terminal 102, signal protection circuit 103, signal follower circuit 104, AC / DC separation circuit 105, AC sampling circuit 106, program-controlled amplifier circuit 107, AD conversion circuit 1 108, digital filter circuit 109, vibration signal output 110, program-controlled amplifier circuit 111, AD conversion circuit 2 112, gap signal output 113, bias signal input 114, DA conversion circuit 115, signal follower output 116, DB9 interface signal output 117, BNC interface output 201, sensor type 202, switch logic 203, digitally controlled electronic switch 204, power supply output 205, two-wire signal input 206, sensor input terminal wiring method 301, program-controlled amplifier 302, AD converter 303, data conversion and calculation 304, real-time data communication 305, output result 306, configuration data communication. [Specific implementation method]

[0024] As shown in the attached drawings, the present invention provides a multifunctional input monitor module for a nuclear power plant, including an analog input (AI) channel, an analog output (AO) channel, a switch output DO channel and a network communication circuit. Analog input (AI) channel: After the sensor signal input is sent to the monitor module, it is separated from the AC and DC by a buffer circuit; the DC signal is attenuated, and the AC signal is amplified by a process control amplifier and input to the analog-to-digital AD converter, and AD conversion is performed under the synchronization of the key phase signal; the data is processed by the central processing unit (CPU) and converted into an engineering quantity; the sensor signal is connected to the monitor analog input (AI) channel, and according to the type of sensor connected, the digital electronic switch is controlled by the switch logic to send the +24VDC power supply, or -24VDC power supply, or two-wire active signal input, or two-wire passive signal input required by the sensor; the central processing unit (CPU) is respectively connected to the analog output (AO) channel, the switch output DO Channel and network communication circuit; analog output (AO) channel, the digital quantity sent by the central processing unit (CPU), is converted by the digital-to-analog converter DAC, amplified, impedance matched, and converted into record output; switch output DO channel, the digital quantity sent by the central processing unit (CPU), outputs the switch signal through the relay, the corresponding relationship between the switch output and the analog input (AI) channel is freely configured or cross-module for complex logic combination output; network communication circuit: with a variety of network communication functions, providing one RS485 interface and two CAN bus interfaces, RS485 communicates with the key phase & local configuration module to receive configuration information; using a dedicated protocol, master-slave communication mode; CAN1 / 2 are hot standby for each other, redundant communication mode, and real-time data is transmitted between modules; using a dedicated protocol, token communication mode and trigger communication mode in parallel, 1000kbps.

[0025] Among them, after the sensor signal input is sent to the monitor module, it is separated from the AC and DC by the buffer circuit, and the AC and DC signals are amplified by software, processed separately, and converted into the required engineering quantity. According to the type of sensor connected, the switch logic controls the CNC electronic switch and sends the +24VDC power supply, or -24VDC power supply, or two-wire active signal input, or two-wire passive signal input required by the sensor to meet the power supply requirements of various sensors used by TSI instruments. The analog output (AO) channel has four independent 4-20mA analog outputs (AO). The upper and lower limits, proportions, and hysteresis corresponding to AO can be configured, and the corresponding relationship between analog output and input channels can be freely configured. There are eight switch output DO channels, providing eight 1AC electromagnetic relay outputs. The corresponding relationship between switch output and input channels can be freely configured, and complex logic combination output can also be performed across modules.

[0026] The universal monitor module of the present invention integrates various measurement parameters of TSI instruments and monitoring and protection functions of multiple varieties of each measurement parameter into a universal monitor module, and adopts advanced computer technologies such as software setting and measurement parameter adaptation to complete the setting of measurement parameters and alarm setting values, 4-channel recording output, 8-channel alarm output, and free combination across channels. The multifunctional input monitor module is specifically described as follows:

[0027] 1. Analog input (AI) channel: There are four analog input (AI) channels. After the sensor signal input is sent to the monitor module, it is separated into AC and DC through the buffer circuit; the DC signal is amplified or attenuated, and the AC signal is amplified by the process control amplifier and input to the analog-to-digital (AD) converter, and AD conversion is performed under the synchronization of the key phase signal; the data is processed by the central processing unit (CPU) and converted into the required standard engineering quantity value.

[0028] 2. The sensor signal is connected to the monitor analog input (AI) channel. According to the type of sensor connected, the switch logic controls the CNC electronic switch to provide the sensor with the required power supply of +24VDC, -24VDC, or two-wire signal input.

[0029] 3. Analog output (AO) channel: Provides four independent 4-20mA analog outputs, load capacity 0-750Ω, isolation voltage > 500V. After engineering conversion, the signal from the analog input is output in the form of 4-20mA for monitoring by this system, third-party equipment or other instruments. The upper and lower limits, proportions, and hysteresis corresponding to AO can be configured, and the corresponding relationship between analog output and input channels can be freely configured.

[0030] 4. Switch output (DO) channel: Provide eight 1AC electromagnetic relay outputs, dry node, load capacity 6A250VAC / 30VDC. DO can be configured as single-channel eight-level alarm or four-channel two-level alarm as alarm output. Four-level alarm: positive alarm 1, that is, positive first value alarm, also known as positive alarm function; positive alarm 2, that is, positive second value alarm, also known as positive trip or danger alarm function; negative alarm 1, that is, negative first value alarm, also known as negative alarm function; negative alarm 2, that is, negative second value alarm, also known as negative trip or danger alarm function. Two-level alarm: Alarm 1, that is, first value alarm, what we commonly call alarm function, outputs positive alarm signal and negative alarm signal through "AND" gate; Alarm 2, that is, second value alarm, what we commonly call trip or danger alarm function, outputs positive trip signal and negative trip signal through "AND" gate. The corresponding relationship between switch output and input channel can be freely configured, and complex logic combination output can also be performed across modules.

[0031] 5. Network communication: Provide one RS485 and two CAN bus interfaces, RS485 communicates with key phase & local configuration modules to receive configuration information; use dedicated protocol, master-slave communication mode. CAN1 / 2 are hot standby, redundant communication mode, transmit real-time data between modules; use dedicated protocol, token communication mode and trigger communication mode in parallel, 1000kbps.

[0032] 6. Processing of other special signals: ① Key phase signal: Four-way synchronous key phase signal, switch input type, comes from the key phase & local configuration communication module. ② Special signal: switch input signal, comes from the bus board. Bypass function (BYPASS), when the key phase & local configuration communication module receives the bypass signal, a part of the configured BYPASS signal is not output; alarm multiplication function (SEQUENCE), when the key phase & local configuration communication module receives the alarm multiplication signal, the alarm value and the trip value are multiplied by the constant defined in the configuration, so that the alarm limit is expanded or reduced to meet the special requirements of the critical speed of the unit during the start and stop process of the unit; alarm reset function (RESET), when the key phase & local configuration communication module receives the alarm reset signal, the alarm signal configured as the alarm self-locking is released.

[0033] Regarding the analog input channel, the following options are available: (1) DC component, the allowed input voltage range is -24VDC~0~+24VD. When configured as a single-channel measurement mode, it can monitor and protect measurement parameters such as axial displacement, differential expansion, and cylinder expansion. When configured as a dual-channel combined measurement, it can monitor and protect measurement parameters such as compensated differential expansion and inclined differential expansion. (2) AC component, the allowed input voltage range is 4VPK-PK, the maximum signal value is 20VACrms, and the signal frequency range is 0-20KHz; it can monitor and protect measurement parameters such as vibration speed, displacement, acceleration, etc., and has an integration function, providing a bandpass filter that can be optionally configured by the user. (3) Speed ​​signal, obtained by calculation from the AC signal, the detection calculation method can be selected as peak-to-peak measurement, zero-crossing measurement, and specified trigger point measurement; in the speed range of 1~6000RPM, it can monitor and protect measurement parameters such as speed, zero speed, reversal, peak-to-peak eccentricity, and follow-up eccentricity. (4) Power supply for field sensors: Each channel has a power supply network to realize adaptive power supply, status readback and other functions. (5) BNC output: The input signal is output after the follower for use by other devices. Short circuit is allowed. The lag needs to be compensated automatically during data analysis.

[0034] The present invention is further described below in conjunction with specific embodiments:

[0035] The present invention provides a universal monitor module, which integrates various measurement parameters of TSI instruments and monitoring and protection functions of multiple varieties of each measurement parameter into a universal monitor module, and adopts advanced computer technologies such as software setting and measurement parameter adaptation to complete the setting of measurement parameters, alarm setting values, channel recording output, alarm output, and free combination across channels. The detailed description of each part of the multifunctional input monitor module of the nuclear power plant is as follows:

[0036] like Figure 2As shown, the analog signal measurement part (received various sensor signals), the sensor signal is connected from the sensor input terminal 101 and sent to the signal protection circuit 102. The main function of the signal protection circuit 102 is to limit the current and voltage of the input signal to prevent excessive input voltage or current from damaging the monitor module; the voltage limit range for the external input signal is: ±24V, and the current limit range is: 30mA. The output end of the signal protection circuit 102 is respectively connected to the signal follower circuit 103 and the signal follower output 115. The main functions of the signal follower circuit 103 and the signal follower output 115 are impedance matching, improving the input impedance, so as to reduce the impact on the input sensor signal. Among them, the output signal of the signal follower 103 is used internally by the monitor, and the output signal of the signal follower 115 is connected to the DB9 interface signal output 116. The DB9 interface signal output 116 is connected to the BNC interface output 117 for external use by other systems. The output of the signal follower 115 adds a current limiting and voltage limiting circuit to prevent the output terminal from being wrongly wired, causing large current and large voltage to be input to the monitor module. The output end of the signal follower 103 is sent to the AC / DC separation circuit 104. The sensor signal of the TSI instrument is relatively complex, including AC signals and DC signals. In some cases, the AC signal is a small signal, including millivolt-level signals and sometimes tens of volts; the DC signal has a positive voltage signal and a negative voltage signal; and there is an AC signal superimposed on the DC signal. It is precisely because of these complex input signals that the traditional TSI instrument uses different hardware circuits to process the signals of different measurement parameters separately, that is, to form monitor modules with different parameters. How to solve this problem is one of the key points of the present invention. The measures taken by the present invention are to separate the AC and DC signals, and the AC and DC signals are processed separately by software control. After the AC / DC separation circuit 104, the signal is separated into two paths after AC / DC separation, and AC sampling and DC sampling are performed respectively. The AC signal goes through the AC sampling circuit 105, and is sent to the program-controlled amplifier circuit 106 by the software program according to the characteristics of the input sensor signal, and the signal is adjusted to a suitable range. After passing through the AD conversion circuit 107, the analog-to-digital conversion is completed, and the continuous analog signal is converted into a digital signal. The digital filter circuit 108 performs digital filtering on the collected input signal to eliminate or reduce interference signals, and finally adjusts it to a suitable signal and sends it to the CPU at the vibration signal output 109; the DC signal is adjusted to a suitable signal through the DC sampling, program-controlled amplifier circuit 110, and AD conversion circuit 111, and is sent to the CPU at the gap signal output 112. The CPU adaptively outputs a DC signal according to the size of the received AC and DC signals. After the bias signal input 113 and the DA conversion circuit 114, this signal is input to the DC signal program-controlled amplifier to accurately control the amplifier's gain.

[0037] like Figure 3As shown, in the sensor power supply circuit, the sensor signal is connected to the sensor type 201. According to the connected sensor type, the switch logic 202 controls the CNC electronic switch 203, so that the power output 204 determines whether the power supply sent to the sensor is +24VDC or -24VDC, or the two-wire signal input 205 is sent out as the power supply of the sensor. The sensor input terminal wiring method 206 lists the power supply requirements required by different sensor types in detail, which are divided into four types. These four types have already included all the sensor requirements of the TSI instrument. It can be seen from the sensor input terminal wiring method 206 that the terminal SGN is connected to the input signal (for the sensor output signal), the terminal COM is connected to the signal common line, and the terminal POW is connected to the sensor power supply. As for the type of power supply, it is completely controlled by the switch logic inside the monitor module, realizing the unification of the sensor wiring terminals.

[0038] like Figure 4 As shown, in the analog recording output part, the digital quantity sent by the CPU is converted into recording output (current or voltage output) through DAC digital-to-analog conversion, amplification, impedance matching, and data isolation and power isolation are adopted. The four-channel analog recording outputs do not share a common ground. The recording output corresponds to which input channel, which can be arbitrarily configured and selected by the software.

[0039] like Figure 5 As shown, the digital quantity sent by the CPU drives the sealed relay to output the switch signal through a high-current Darlington tube, and data isolation and power isolation are adopted. The eight-way relay dry contact output corresponds to which input channel, which can be arbitrarily configured and selected by the software. Complex logic configuration output can be performed, and logical combination output can also be executed across modules.

[0040] like Figure 6 As shown, the analog signal input by the sensor is amplified by the programmable amplifier 301. According to the channel configuration, the amplifier ratio is determined, and the input signals of various ranges are standardized to the applicable range of the A / D converter, and the signal is regularized to ±10V. The AD converter 302 performs A / D conversion on the analog signal and converts the standardized analog signal into the original digital quantity. The data conversion and calculation 303 filters the original digital quantity and converts it into an engineering value according to the configuration content, and checks the alarm status, and stores the value in the real-time database of the module. The real-time data communication 304 sends the content in the real-time database to the local communication configuration module and other monitor modules. The result output 305 determines the record output and the working status of the switch (relay) according to the configuration content and real-time data. The configuration data communication 306 receives the configuration information and stores it in the non-volatile medium (Flash) of the monitor module according to the command of the configuration software, or sends the local configuration to the configuration software.

[0041] The present invention is not limited to the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.

Claims

1. A multifunctional input monitor module for a nuclear power plant, characterized in that: It includes analog input AI channel, analog output AO channel, switch output DO channel and network communication circuit, among which: In the analog input AI channel, after the sensor signal input is sent to the monitor module, it is separated from the AC and DC by a buffer circuit; the DC signal is attenuated, and the AC signal is amplified by a process control amplifier and input to the analog-to-digital AD converter, and AD conversion is performed under the synchronization of the key phase signal; the specific process is as follows: in the analog input AI channel, the sensor signal is connected from the sensor input end (101) and sent to the signal protection circuit (102), and the signal protection circuit (102) limits the current and voltage of the input signal, and its voltage limit range for the external input signal is ±24V, the current limiting range is 30mA, the output end of the signal protection circuit (102) is respectively connected to the signal following circuit (103) and the signal follower output (115), the output signal of the signal follower output (115) is connected to the DB9 interface signal output (116), and the DB9 interface signal output (116) is connected to the BNC interface output (117); the output end of the signal following circuit (103) is connected to the AC / DC separation circuit (104), and the signal is separated by AC / DC through the AC / DC separation circuit (104) and then divided into two paths, respectively AC sampling and DC sampling; the AC signal is sent to the program-controlled amplification circuit (106) through the AC sampling circuit (105), the signal is adjusted to a suitable range, and the analog-to-digital conversion is completed through the AD conversion circuit (107), and the continuous analog signal is converted into a digital signal. The output end of the AD conversion circuit (107) is connected to the digital filtering circuit (108), and the digital filtering circuit (108) performs digital filtering on the collected input signal and sends it to the CPU at the vibration signal output end (109); the DC signal is sent to the CPU through the DC sampling and program-controlled amplification circuit (11 0), the AD conversion circuit 2 (111) adjusts the signal to a suitable signal and sends it to the CPU at the gap signal output terminal (112); the CPU adaptively outputs a DC signal according to the size of the received AC and DC signals, and the signal is input to the DC signal programmable amplifier after passing through the bias signal input terminal (113) and the DA conversion circuit (114) to control the amplifier's amplification factor; the data is converted into engineering quantity after being processed by the CPU, and the CPU is respectively connected to the analog output AO channel, the switch output DO channel and the network communication circuit; In the analog output AO channel, the digital quantity sent by the CPU is converted by the digital-to-analog converter DAC, amplified, impedance matched, and converted into a record output; In the switch output DO channel, the digital quantity sent by the CPU is output as a switch signal via the relay. The corresponding relationship between the switch output and the analog input AI channel can be freely configured or a complex logic combination output can be performed across modules. The network communication circuit provides one RS485 interface and two CAN bus interfaces.

2. The multifunctional input monitor module for a nuclear power plant according to claim 1, characterized in that: In the analog output AO channel, data isolation and power supply isolation are adopted between the CPU and the digital-to-analog converter, and the analog output AO channel has four independent 4-20mA analog output AOs.

3. The multifunctional input monitor module for a nuclear power plant according to claim 1, characterized in that: In the switch output DO channel, the digital quantity sent by the CPU drives the sealed relay to output the switch signal through a large current Darlington tube, and data isolation and power isolation are adopted to provide eight-way electromagnetic relay output.

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