Motor train unit network module detection system

Abstract

The utility model belongs to the technical field of motor train unit network module detection, in particular to a motor train unit network module detection system, which comprises a main control module, a communication interface module and a power supply, and is characterized in that the main control module is respectively connected with a PT100 module to be detected and an I / O module to be detected through the communication interface module; the power supply is connected with the master control module. According to the utility model, through data interaction between the master control module and the PT100 module to be detected and the I / O module to be detected, the PT100 module to be detected and the I / O module to be detected which are replaced by a train alarm are detected, whether the module to be detected fails or not is detected, support is provided for detection and maintenance of equipment on site, unnecessary factory repair is reduced, the structure is simple, the integration degree is high, and the cost is low. The autonomous maintenance capability is improved, and the maintenance cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of train equipment detection, in particular to a network module detection system for a motor vehicle group. Background Art

[0002] At present, the EMU train network control system uses Siemens imported software and hardware systems. Among them, the MVB-COMPACTI / O module and MVB-COMPACTPT100 module have a high failure rate. How to detect their status performance is an urgent problem to be solved on site.

[0003] MVB-CompactI / O module: As an integrated network device with many fixed input and output channels, it belongs to the distributed input and output station, which is used to receive special signals sent from the driver's cab (master station CCU) through the MVB network, such as buttons, switches, indicators, circuit breakers, coding plugs and main controllers, etc. It also publishes the signals collected by the in-vehicle monitoring parts connected to each channel of the module itself to the MVB bus according to the communication protocol. An MVB-Compactl / O module has 2x16 binary inputs, 1x8 binary outputs (including 1 PWM output), 1 digital address coding input interface, 4 DC24V output interfaces, 2 high-speed binary input interfaces and 2 MVB communication module interfaces.

[0004] MVB-CompactPt100 module: It is an integrated network device with fixed input channels. It has an input interface for connecting 20 Pt100 temperature sensors (four-wire type). It is used to collect the temperature from the train wheel bearings, gearboxes, traction motors and other parts, and upload them to the main station CCU through the MVB network. When the temperature rises abnormally, the CCU controls the speed or stops the vehicle according to the preset rules.

[0005] In recent years, the failure rate of MVB-COMPACTI / O modules and MVB-COMPACTPT100 modules is high. There is no special detection method on site, so they need to be returned to the factory for replacement. The cost of returning to the factory for maintenance is high and there is no alternative. Therefore, it is urgent to design a system for localization detection of MVB-COMPACTI / O modules and MVB-COMPACTPT100 modules for EMUs, so as to provide support for improving the independent maintenance capability of EMUs, saving maintenance costs or carrying out localization substitution. Utility Model Content

[0006] The utility model aims to provide a network module detection system for a train set to solve the problem of fault detection on an MVB-COMPACTI / O module and an MVB-COMPACTPT100 module proposed in the above background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A detection system for a train network module comprises a main control module and a communication interface module, wherein the communication interface module comprises a PT100 sensor simulation unit, an I / O port simulation unit and an MVB communication module;

[0009] The main control module is connected to the input end of the PT100 module to be tested through the PT100 sensor simulation unit; the output end of the PT100 module to be tested is connected to the main control module through the MVB communication module;

[0010] The main control module is connected to the input end of the I / O module to be tested through the I / O port simulation unit; the output end of the I / O module to be tested is connected to the main control module through the MVB communication module.

[0011] Furthermore, the PT100 sensor simulation unit includes a PT100 channel selection relay, a PT100 resistor matrix and a resistance detection circuit. The PT100 resistor matrix is ​​selected by the PT100 channel selection relay and the PT100 module to be tested, and the signal input end of the PT100 channel selection relay is connected to the main control module; the input end of the resistance detection circuit is connected to the PT100 resistor matrix, and the output end of the resistance detection circuit is connected to the main control module.

[0012] Furthermore, the PT100 channel selection relay is a 20-way high-speed relay, the PT100 resistance matrix is ​​a 16-way precision resistance matrix, and the resistance detection circuit is a DC bridge.

[0013] Furthermore, the I / O port simulation unit includes an ordinary binary input interface, an ordinary binary output interface, an analog input interface and a high-speed binary input interface, and the ordinary binary input interface, the ordinary binary output interface, the analog input interface and the high-speed binary input interface are respectively connected to the input and output interfaces corresponding to the I / O module to be tested; the analog input interface of the I / O port simulation unit is connected to the main control module.

[0014] Furthermore, the communication interface module also includes an AI analog input acquisition unit, and the analog input interface of the I / O port simulation unit is connected to the main control module through the AI ​​analog input acquisition unit; or, the resistance detection circuit of the PT100 sensor simulation unit is connected to the main control module through the AI ​​analog input acquisition unit.

[0015] Further, the main control module includes a processor unit and a power simulation unit;

[0016] The processor unit is connected to the input end of the PT100 module to be tested through the PT100 sensor simulation unit, and the output end of the PT100 module to be tested is connected to the processor unit through the MVB communication module; the processor unit is connected to the input end of the I / O module to be tested through the I / O port simulation unit; the output end of the I / O module to be tested is connected to the processor unit through the MVB communication module;

[0017] The power supply simulation unit is respectively connected to the input end of the PT100 module to be tested and the input end of the I / O module to be tested through the processor unit.

[0018] Further, the processor unit includes a CPU subunit, an FPGA subunit and a storage subunit;

[0019] The CPU subunit is connected to the storage subunit; the CPU subunit is connected to the output end of the PT100 module to be tested and the output end of the I / O module to be tested;

[0020] The FPGA subunit is connected to the CPU subunit via a parallel bus;

[0021] The FPGA sub-unit is connected to the PT100 sensor simulation unit and the I / O port simulation unit respectively.

[0022] Furthermore, the power supply simulation unit includes a 110V programmable power supply and a 24V programmable power supply, the 110V programmable power supply is connected to the I / O module to be tested or the PT100 module to be tested through the CPU subunit; the 24V programmable power supply is connected to the PT100 module to be tested through the CPU subunit.

[0023] Furthermore, the main control module also includes an MVB channel switching unit; the MVB communication module includes a group A MVB communication unit and a group B MVB communication unit, and the CPU subunit is connected to the group A MVB communication unit and the group B MVB communication unit respectively through the MVB channel switching unit.

[0024] The utility model also provides a network module detection device for a train set, comprising a main control board, a program-controlled power supply and a communication interface circuit, wherein the communication interface circuit comprises a PT100 module interface circuit and an I / O module interface circuit;

[0025] The main control board is connected to the input end of the PT100 module to be tested through the PT100 module interface circuit; the output end of the PT100 module to be tested is connected to the main control board through the MVB bus;

[0026] The main control board is connected to the input end of the I / O module to be tested through the I / O module interface circuit; the output end of the I / O module to be tested is connected to the main control board through the MVB bus;

[0027] The program-controlled power supply is connected to the PT100 module to be tested or the I / O module to be tested through the main control board.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] The utility model discloses a network module detection system for a train group, including a main control module, a communication interface module and a power supply. The main control module is used to send a test instruction to a PT100 module to be tested and an I / O module to be tested, receive the execution result of the test instruction by the PT100 module to be tested and the I / O module to be tested, and detect the working status of the PT100 module to be tested and the I / O module to be tested according to the execution result. The main control module exchanges data with the PT100 module to be tested and the I / O module to be tested through the communication interface module, detects the PT100 module to be tested and the I / O module to be tested that are replaced by the train alarm, detects whether the module to be tested is faulty, provides support for on-site detection and maintenance of equipment, and reduces unnecessary return to the factory for repair. At the same time, a network module detection device for a train group is provided, which has a simple structure and a high degree of integration, improves the autonomous maintenance capability, and saves maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the utility model;

[0031] Figure 2 This is a system frame diagram of the utility model;

[0032] Figure 3 This is the circuit structure diagram of the main control module;

[0033] Figure 4 Detect the wiring diagram for the PT100 module to be tested;

[0034] Figure 5 Check the wiring diagram for the I / O module to be tested. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention, but the present invention is not limited to the implementation methods described below.

[0036] Example 1

[0037] See also Figure 1-5 , this embodiment provides a train network module detection system, including a host computer, a main control module, a communication interface module, a host computer communication module and a power supply.

[0038] The main control module is used to send test instructions to the PT100 module and the I / O module to be tested, receive the execution results of the test instructions by the PT100 module and the I / O module to be tested, and detect the working status of the PT100 module and the I / O module to be tested according to the execution results.

[0039] The main control module simulates the operation signals sent by the driver's cab, including the switching quantity, digital quantity, analog quantity and other signals of simulated buttons, switches, indicators, circuit breakers, coding plugs and main controllers, polls the slave device information on the MVB bus according to the address code, exchanges data with the slave device (I / O module to be tested), and detects whether the data returned by the slave device (I / O module to be tested) matches the test data sent, thereby detecting the working condition of the I / O module to be tested; and simulates the output resistance of the PT100 temperature sensor of each channel on the train, exchanges data with the slave device (PT100 module to be tested), and detects whether the data returned by the slave device (PT100 module to be tested) matches the test data sent, thereby detecting the working condition of the PT100 module to be tested.

[0040] Specifically, the main control module includes a processor unit and a power simulation unit.

[0041] The processor unit is used to: send the test instruction to the PT100 module to be tested through the PT100 sensor simulation unit, receive the feedback result of the PT100 module to be tested on the test instruction, compare the test instruction with the feedback result, and detect the working condition of the PT100 module to be tested; or send the test instruction to the I / O module to be tested through the I / O port simulation unit, receive the feedback result of the I / O module to be tested on the test instruction, compare the test instruction with the feedback result, and detect the working condition of the I / O module to be tested.

[0042] Specifically, the processor unit includes a storage subunit, a CPU subunit and an FPGA subunit;

[0043] The storage subunit is used to: store the test instructions of the PT100 module to be tested and the I / O module detection points to be tested;

[0044] The test instructions specifically include:

[0045] 1. Test the MVB address coding function of the I / O module and PT100 module to be tested;

[0046] 2. MVB communication performance test of the I / O module and PT100 module to be tested;

[0047] 3. Test the binary output level and overcurrent protection of the I / O module to be tested, the ordinary binary level input performance test, and the high-speed binary input performance test;

[0048] 4. I / O module PWM analog output and frequency detection;

[0049] 5. Test the input resistance setting and channel selection function of the PT100 module to be tested.

[0050] The CPU subunit is used to: call the test instructions in the storage subunit and send the test instructions to the FPGA subunit; receive the execution results of the test instructions sent by the PT100 module to be tested and the I / O module to be tested, and detect whether the execution results match the test instructions, thereby detecting whether the execution results of the test instructions of the PT100 module to be tested and the I / O module to be tested are accurate.

[0051] The FPGA subunit is used for: the FPGA subunit is connected to the CPU subunit through a parallel bus, receives the test instructions sent by the CPU subunit, and controls the opening and closing of the PT100 channel selection relays and the output resistance value of each channel on the PT100 sensor simulation unit according to the test instructions; or, controls the addressing and input and output of each channel on the I / O port simulation unit according to the test instructions.

[0052] The power supply simulation unit is used to receive the test instructions sent by the main control module and provide different working voltages for the PT100 module to be tested and the I / O module to be tested according to the test instructions.

[0053] Specifically, the power supply simulation unit includes a 110V programmable power supply and a 24V programmable power supply, both of which are connected to the CPU subunit of the processor unit, and the processor unit controls the power output of the 110V programmable power supply and the 24V programmable power supply, the output end of the 110V power supply is connected to the I / O module to be tested or the PT100 module to be tested, and the output end of the 24V programmable power supply is connected to the PT100 module to be tested; the programmable power supply is a programmable power supply, which can provide different operating voltages for the I / O module to be tested and the PT100 module to be tested, simulate different operating conditions of the train on-board power supply, detect the operating conditions of the I / O module to be tested and the PT100 module to be tested under different operating voltages such as normal working voltage, undervoltage, and instantaneous power failure, and conveniently realize the testing of the operating conditions of the PT100 module to be tested and the I / O module to be tested under different operating voltages.

[0054] The communication interface module is used for data exchange between the main control module and the PT100 module to be tested and the I / O module to be tested, including the PT100 sensor simulation unit, the I / O port simulation unit, the AI ​​analog input acquisition unit and the MVB communication module;

[0055] The PT100 sensor simulation unit is used to: receive the test instructions sent by the main control module, simulate the output resistance values ​​of the PT100 temperature sensors of each channel on the EMU train at different temperatures according to the test instructions, and send the output resistance values ​​to the processor unit;

[0056] The I / O port simulation unit is used to: receive the test instructions sent by the main control module, and simulate the input and output of the I / O port on the train according to the test instructions;

[0057] The AI ​​analog input acquisition unit is used to collect analog quantities from the PT100 sensor analog unit and the I / O port analog unit, and convert the analog quantities into digital quantities that can be recognized by the processor unit.

[0058] The MVB communication module is used to receive the return data sent by the PT100 module to be tested and the I / O module to be tested, and send the return data to the main control module.

[0059] Specifically, the PT100 sensor simulation unit includes a PT100 channel selection relay, a PT100 resistor matrix and a resistor detection circuit. The PT100 resistor matrix is ​​selected with the PT100 module to be tested through the PT100 channel selection relay. The signal input end of the PT100 channel selection relay is connected to the processor unit of the main control module; the processor unit controls the opening and closing of the PT100 channel selection relay; the input end of the resistor detection circuit is connected to the PT100 resistor matrix, and the output end of the resistor detection circuit is connected to the processor unit of the main control module. The resistor detection circuit detects the resistance value output by the PT100 resistor matrix, and sends the resistance value output by the PT100 resistor matrix to the processor unit through the AI ​​analog input acquisition unit.

[0060] The processor unit calls the test instruction and sends it to the PT100 sensor simulation unit. The processor unit encodes addresses for different channels of the PT100 sensor simulation unit and decodes the test instruction into a resistance signal that can be recognized by the PT100 module to be tested. The PT100 sensor simulation unit selects different channels on the PT100 module to be tested and sends the resistance signal to the PT100 module to be tested. The PT100 module to be tested reacts to the resistance signal according to the received resistance signal, that is, the PT100 module to be tested on the simulated train reacts according to the received resistance signal representing the axle temperature, detects the addressing function and data input and output function of the PT100 module to be tested for temperature sensors representing different channels, and detects whether the PT100 module to be tested reacts accurately to the received different temperatures, thereby detecting whether the working condition of the PT100 module to be tested is normal.

[0061] In practice, after the PT100 module to be tested receives the resistance signal, it sends the monitored resistance value to the MVB communication module. The MVB communication module feeds back the resistance value detected by the PT100 module to be tested to the processor unit. The processor unit detects whether the resistance value fed back by the PT100 module to be tested is accurate based on the resistance value fed back by the PT100 module to be tested and the resistance value actually output by the PT100 resistance matrix detected by the resistance detection circuit, thereby detecting whether the working condition of the PT100 module to be tested is normal.

[0062] The I / O port simulation unit includes an ordinary binary input interface, an ordinary binary output interface, an analog input interface and a high-speed binary input interface. The ordinary binary input interface, the ordinary binary output interface, the analog input interface and the high-speed binary input interface are respectively connected to the input and output interfaces corresponding to the I / O module to be tested; the analog input interface of the I / O port simulation unit is connected to the processor unit through the AI ​​analog input acquisition unit.

[0063] The I / O port simulation unit is connected to the processor unit, and the I / O port simulation unit is connected to each channel of the I / O module to be tested; the processor unit calls the test instruction, selects each channel of the I / O port simulation unit, and sends various switch instructions to the I / O module to be tested of the corresponding channel. The I / O module to be tested responds to the test instruction, and feeds back the execution result of the test instruction to the processor unit through the MVB communication module, detects the addressing function and input and output function of the I / O module to be tested, and whether the response of the I / O module to different switch instructions is accurate, thereby detecting whether the working condition of the I / O module to be tested is normal.

[0064] The MVB communication module usually includes an A / B group, which is often used as one master and one backup, namely the commonly used group A MVB communication unit and the backup group B MVB communication unit; an MVB channel switching unit is set in the main control module, and the MVB channel switching unit is used to switch between the commonly used group A MVB communication unit and the backup group B MVB communication unit. The CPU subunit communicates with the group A MVB communication unit and the group B MVB communication unit respectively through the MVB channel switching unit. When the commonly used group A MVB communication unit fails, the CPU subunit controls the MVB channel switching unit to automatically switch to the backup group B MVB communication unit.

[0065] The power supply is connected to the main control module. The power supply is preferably a 110V switching power supply, and the power supply also includes a power conversion unit, which converts 110V into 5V, 3.3V and 1.2V, 3.3V is used to power the above-mentioned processor units such as the CPU subunit, the PT100 sensor simulation unit, the I / O port simulation unit, etc., and 1.2V is used to power the FPGA subunit.

[0066] The host computer is used to interact with the main control module and display the data of the PT100 module and the I / O module to be tested. The host computer is connected to the main control module through the host computer communication module.

[0067] Example 2

[0068] This embodiment provides a detection device for a train network control module, including a main control board, a switch, a 110V programmable power supply, a 24V programmable power supply, an I / O module interface circuit and a PT100 module interface circuit, an integrated terminal and a display. For a system block diagram of the detection device, please refer to Figure 2 shown.

[0069] The main control board integrates the CPU main control chip, FPGA programmable gate array high computing power chip (hereinafter referred to as FPGA chip), NV-SRAM storage chip, MVB communication sub-board, AI analog input acquisition circuit, power conversion circuit (110V to 5V, 3.3V, 1.2V) and interfaces and wiring terminals that meet the needs of the two modules to be tested.

[0070] The CPU main control chip and the FPGA chip form a processor unit including a soft core and a hard core. The CPU main control chip and the FPGA chip are connected through a parallel bus; the SRAM stores test instructions (test items and parameters); the CPU is used for communication and data processing functions, the CPU main control chip and the host computer are connected to communicate using RS232J and RS485 interface chips, and the CPU main control chip communicates with the PT100 module to be tested and the I / O module to be tested through the MVB bus; the FPGA chip is the program control input and output variables, and the FPGA chip is connected to the PT100 module to be tested through the PT100 module interface circuit; the FPGA chip is connected to the I / O module to be tested through the I / O module interface circuit.

[0071] PT100 module interface circuit please refer to Figure 4 , including 20-way high-speed relays, 16-way precision resistor matrix and precision resistor detection. The FPGA chip is connected to the 16-way precision resistor matrix through the 20-way high-speed relays. The 16-way precision resistor matrix is ​​respectively connected to each channel of the PT100 module to be tested. The 20-way high-speed relays select each channel of the PT100 module to be tested. The precision resistor detection detects the actual output resistance value of the 16-way precision resistor matrix, and sends the actual output resistance value of the detection side to the CPU main control chip through the AI ​​analog input acquisition unit.

[0072] I / O module interface circuit reference Figure 5, including 32-way ordinary binary output interfaces, 1-way PWM analog input interface, 8-way ordinary binary output interfaces and high-speed binary input interfaces. The 32-way ordinary binary output interfaces, 8-way ordinary binary output interfaces and high-speed binary input interfaces are respectively connected to the input and output terminals corresponding to the I / O module to be tested, and the 1-way PWM analog input interface is sent to the CPU main control chip through the AI ​​analog input acquisition unit.

[0073] The test items of the PT100 module to be tested in this embodiment are as follows:

[0074] Table 1: Test items of the MVB-COMPACTPT100 module to be tested

[0075]

[0076] Specifically, when testing the PT100 module to be tested, please combine the external interface function of the processor unit chip with Figure 3 As shown:

[0077] X1 is DC110V switching power input;

[0078] X2A is connected to X1 of the PT100 module under test, and the X1 interface of the PT100 module under test is powered by DC110V through the safety relay output;

[0079] X4 is connected to X3 / X4 / X5 / X6 / X7 / X8 of the PT100 module to be tested, and the output is the analog input of the PT100 module to be tested through the resistor matrix;

[0080] X5A is connected to X1 of the PT100 module under test, and the output is the device address input of the PT100 module under test through address setting;

[0081] X9 is connected to the MVB communication interface X9 of the CIO module under test;

[0082] X10 is the RS232 communication interface of the host industrial computer.

[0083] The specific test steps are as follows:

[0084] After the detection device and the PT100 module to be tested are connected to the power supply and all interface lines, turn on the 110V switch power supply, and the system starts power-on self-test. The test includes the following steps:

[0085] 1. The host computer controls the voltage output of the programmable power supply. The programmable power supply simulates the train on-board power supply to realize the control changes of voltage and output time, and supplies power to the PT100 module to be tested.

[0086] 2. The main control board sends a test instruction. After the test instruction is recognized and processed by the processor unit CPU main control chip, the preset control logic is executed through the FPGA chip to drive the relay, so that the high-speed relay switches to the corresponding channel and simulates the change of Pt100 to send different precision resistance values. The resistance signal is sent to the corresponding input terminal of the PT100 module to be tested through the PT100 interface circuit line. After the PT100 module to be tested is converted by the internal interface circuit and processed by the CPLD, it communicates with the main control board through the MVB chip, and the main control board determines the returned result.

[0087] 3. The main control board performs MVB address setting simulation test, A / B line switching function test, port timeout test, data return quality test, etc. on the PT100 module to be tested.

[0088] The I / O module detection items to be tested in this embodiment are as follows:

[0089] Table 2 Test items for I / O modules to be tested

[0090]

[0091]

[0092] Specifically, when testing the I / O module, please combine the external interface function of the processor unit chip with Figure 4 As shown:

[0093] X1 is DC110V switching power input;

[0094] X2A is connected to X1 of the I / O module to be tested, and the X1 interface of the I / O module to be tested is powered by DC110V through the safety relay output;

[0095] X3A is connected to X3A of the I / O module to be tested, and the digital output is the digital input of X3A of the I / O module to be tested;

[0096] X3A is connected to X3B of the I / O module to be tested, and the digital output is used as the digital input of X3B of the I / O module to be tested;

[0097] X3B is connected to X3C of the I / O module to be tested, and the digital input is used as the digital output (including 1 PWM analog output) of X3C of the I / O module to be tested;

[0098] X3A is connected to X6 of the I / O module to be tested, and the digital output is used as the first group of Gray code input (high-speed binary input) of the I / O module X6 to be tested;

[0099] X3A is connected to X7 of the I / O module to be tested, and the digital output is used as the second group of Gray code input (high-speed binary input) of the I / O module X7 to be tested;

[0100] X5A is connected to X1 of the I / O module to be tested, and the output is the device address input of the I / O module to be tested through address setting;

[0101] X5B is connected to X2 of the I / O module to be tested, and serves as the DC24V output power supply of the I / O module X2 to be tested through analog input;

[0102] X9 is the MVB communication connection with the I / O module to be tested;

[0103] X10 is the RS232 communication interface of the host industrial computer;

[0104] X20 is DC110V program-controlled power input, and X21 is DC24V program-controlled power input.

[0105] The specific test steps are as follows:

[0106] After the detection device and the I / O module to be tested are connected to the power supply and all interface lines, turn on the 110V and 24V switching power supplies, and the system starts power-on self-test. The test includes the following steps:

[0107] 1. The host computer controls the voltage output of the programmable power supply. The programmable power supply simulates the train onboard power supply to realize the control changes of voltage and output time, and supplies power to the I / O module to be tested. The main control board detects whether the power supply performance of the I / O module to be tested is normal or not through data analysis.

[0108] 2. The main control board sends test instructions to the processor unit. The processor unit implements the on / off and input / output control of each channel of the I / O interface circuit, simulates the switch quantity and analog quantity sent by the driver's room control system, and detects whether the performance of the road is intact by analyzing the returned data.

Claims

1. A train network module detection system, characterized in that: It includes a main control module and a communication interface module, wherein the communication interface module includes a PT100 sensor simulation unit, an I / O port simulation unit and an MVB communication module; The main control module is connected to the input end of the PT100 module to be tested through the PT100 sensor simulation unit; the output end of the PT100 module to be tested is connected to the main control module through the MVB communication module; The main control module is connected to the input end of the I / O module to be tested through the I / O port simulation unit; the output end of the I / O module to be tested is connected to the main control module through the MVB communication module.

2. The train network module detection system according to claim 1, characterized in that: The PT100 sensor simulation unit includes a PT100 channel selection relay, a PT100 resistor matrix and a resistor detection circuit. The PT100 resistor matrix is ​​selected by the PT100 channel selection relay and the PT100 module to be tested. The signal input end of the PT100 channel selection relay is connected to the main control module; the input end of the resistor detection circuit is connected to the PT100 resistor matrix, and the output end of the resistor detection circuit is connected to the main control module.

3. The train network module detection system according to claim 2, characterized in that: The PT100 channel selection relay is a 20-channel high-speed relay, the PT100 resistance matrix is ​​a 16-channel precision resistance matrix, and the resistance detection circuit is a DC bridge.

4. The train network module detection system according to any one of claims 1 to 3, characterized in that: The I / O port simulation unit includes an ordinary binary input interface, an ordinary binary output interface, an analog input interface and a high-speed binary input interface. The ordinary binary input interface, ordinary binary output interface, analog input interface and high-speed binary input interface are respectively connected to the input and output interfaces corresponding to the I / O module to be tested; the analog input interface of the I / O port simulation unit is connected to the main control module.

5. The train network module detection system according to claim 4, characterized in that: The communication interface module also includes an AI analog input acquisition unit, and the analog input interface of the I / O port simulation unit is connected to the main control module through the AI ​​analog input acquisition unit; or, the resistance detection circuit of the PT100 sensor simulation unit is connected to the main control module through the AI ​​analog input acquisition unit.

6. The train network module detection system according to claim 5, characterized in that: The main control module includes a processor unit and a power simulation unit; The processor unit is connected to the input end of the PT100 module to be tested through the PT100 sensor simulation unit, and the output end of the PT100 module to be tested is connected to the processor unit through the MVB communication module; the processor unit is connected to the input end of the I / O module to be tested through the I / O port simulation unit; the output end of the I / O module to be tested is connected to the processor unit through the MVB communication module; The power supply simulation unit is respectively connected to the input end of the PT100 module to be tested and the input end of the I / O module to be tested through the processor unit.

7. The train network module detection system according to claim 6, characterized in that: The processor unit includes a CPU subunit, an FPGA subunit and a storage subunit; The CPU subunit is connected to the storage subunit; the CPU subunit is connected to the output end of the PT100 module to be tested and the output end of the I / O module to be tested; The FPGA subunit is connected to the CPU subunit via a parallel bus; The FPGA sub-unit is connected to the PT100 sensor simulation unit and the I / O port simulation unit respectively.

8. The train network module detection system according to claim 7, characterized in that: The power supply simulation unit includes a 110V program-controlled power supply and a 24V program-controlled power supply. The 110V program-controlled power supply is connected to the I / O module to be tested or the PT100 module to be tested through the CPU subunit; the 24V program-controlled power supply is connected to the PT100 module to be tested through the CPU subunit.

9. The train network module detection system according to claim 8, characterized in that: The main control module also includes an MVB channel switching unit; the MVB communication module includes a group A MVB communication unit and a group B MVB communication unit, and the CPU subunit is connected to the group A MVB communication unit and the group B MVB communication unit respectively through the MVB channel switching unit.

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