Moving device suitable for train PLC maintenance

Abstract

The invention discloses a mobile device suitable for train PLC maintenance, which is characterized in that a PLC screen is arranged on one side of the front surface of a shell, a PLC test switch, a PLC change-over switch, a COM1 port and a COM2 port are arranged at the upper part of the other side of the front surface of the shell, and a PLC communication interface, a network communication switch, an agent node interface and a PLC gateway interface are arranged below the COM1 port and the COM2 port; a DC24V power supply module arranged in the shell is respectively in circuit connection with a PLC detection board, a PLC and a PLC screen which are arranged in the shell, and a COM1 port, a COM2 port, the PLC screen, a PLC communication interface, a PLC test switch and a network communication switch are respectively in circuit connection with the PLC detection board. The system is reasonable in structure, can quickly and accurately position PLC faults, reduces the downtime of equipment, improves the maintenance efficiency, reduces the skill requirements of maintenance personnel, further improves the detection and maintenance speed, and reduces the maintenance and repair cost.

Description

Technical Field

[0001] The invention belongs to a train PLC maintenance device, in particular to a mobile device suitable for train PLC maintenance. Background Art

[0002] In modern train control systems, PLC (programmable logic controller) plays a vital role as the core control component, taking on the control tasks of multiple operating systems of the train. For example, the CPM2A and CP1E series PLCs produced by Omron have been widely used in train control systems for their high efficiency and stability. However, with the increase in the use time of the equipment and the harsh working environment, various faults may occur in the PLC during operation. These faults will not only affect the normal operation of the train, but also increase the difficulty of maintenance. In recent years, with the frequent failure of train PLC (programmable logic controller) in the train electrical workshop, due to the technical blockade of train PLC maintenance methods and program writing, maintenance personnel usually can only rely on the manufacturer's maintenance services or purchase new equipment when facing PLC failures. This dependence leads to long maintenance cycles and high costs, which seriously affects the operating efficiency of the train.

[0003] PLC fault diagnosis and repair mainly rely on proprietary testing equipment provided by manufacturers, as well as circuit debugging using general electronic testing instruments such as oscilloscopes and signal generators. Both methods have their own advantages and disadvantages.

[0004] 1. Manufacturer's testing equipment: The testing equipment provided by the manufacturer can be directly connected to the PLC and perform fault diagnosis through standardized interfaces and dedicated software. Although this method can accurately detect the internal faults of the PLC, it has the following shortcomings: 1. Dependence on manufacturers: Testing equipment and software are usually only available to technicians authorized by the manufacturer, which limits the autonomous maintenance capabilities within the workshop.

[0005] 2. High cost: These devices are expensive and require regular maintenance and updates, which increases maintenance costs.

[0006] 2. Oscilloscope and signal generator: Another common debugging method is to use an oscilloscope and signal generator. This method inputs a specific test signal into the PLC circuit and uses an oscilloscope to observe the circuit response to determine the circuit working status and fault location. Its advantages are: 1. Strong flexibility: Oscilloscopes and signal generators are universal electronic test instruments that are not restricted by manufacturers. Maintenance personnel can use them flexibly according to actual needs.

[0007] 2. Lower cost: These instruments are relatively low cost compared to proprietary test equipment and are suitable for many types of circuit testing.

[0008] Although the method using an oscilloscope and a signal generator is highly flexible and economical, it also has some disadvantages: 1. Complex operation: The use of oscilloscopes and signal generators requires maintenance personnel to have certain professional knowledge and skills, especially in signal setting and waveform analysis. This makes the fault diagnosis process complicated and has a high false alarm rate, further increasing the difficulty of maintenance.

[0009] 2. Limitations of fault diagnosis: Although some faults can be diagnosed through circuit response analysis, the diagnostic capabilities of oscilloscopes and signal generators are limited for some deep-seated logic errors or internal program problems.

[0010] In the field of PLC fault diagnosis and maintenance, the main shortcomings of existing technologies include the following aspects: 1. High cost: Many existing PLC detection devices rely on proprietary tools and software provided by manufacturers. These devices are usually expensive and are limited to authorized maintenance personnel. For environments that require frequent maintenance, this high cost increases the company's production costs.

[0011] 2. Low efficiency: Due to the complexity of existing testing equipment and reliance on manufacturer technical support, the maintenance process is usually time-consuming. Especially after a failure occurs, the waiting time for the manufacturer's engineers to conduct testing and maintenance is long, which affects the operating efficiency of the equipment and causes excessive downtime.

[0012] 3. Strong technical dependence: Existing testing equipment and methods are heavily dependent on the technical support provided by manufacturers. This dependence limits the autonomous maintenance capabilities within the workshop, making it difficult to quickly carry out maintenance work when an emergency failure occurs, affecting the timely recovery of equipment.

[0013] 4. Complex operation: Although the use of general electronic test instruments such as oscilloscopes and signal generators is highly flexible, it requires maintenance personnel to have high professional skills and rich operating experience. This makes the fault diagnosis process complex and has a high false alarm rate, further increasing the difficulty of maintenance. Summary of the invention

[0014] The purpose of the present invention is to provide a mobile device suitable for train PLC maintenance, which has a reasonable structure and can quickly and accurately locate PLC faults, reduce equipment downtime, improve maintenance efficiency, reduce the skill requirements of maintenance personnel, further improve the speed of detection and maintenance, and reduce the cost of maintenance and repair.

[0015] The objective of the present invention is achieved as follows: a mobile device suitable for train PLC maintenance comprises a shell, a PLC screen is arranged on one side of the front of the shell, a PLC test switch, a PLC conversion switch, a COM1 port, and a COM2 port are arranged on the upper part of the other side of the front of the shell, and a PLC communication interface, a network communication switch, a proxy node interface, and a PLC gateway interface are arranged below the COM1 port and the COM2 port; a DC24V power supply module arranged inside the shell is respectively circuit-connected to a PLC detection board, an internal PLC, and a PLC screen, and the COM1 port, the COM2 port, the PLC screen, the PLC communication interface, the PLC test switch, and the network communication switch are respectively circuit-connected to the PLC detection board, and the COM1 port and the COM2 port are circuit-connected to the internal PLC, and the network communication switch is circuit-connected to the proxy node interface, and the PLC gateway interface and the adapter are respectively circuit-connected to the PLC screen, and the adapter is circuit-connected to the internal PLC.

[0016] The electronic devices used in the present invention are: an external 24V power supply, a 7815 chip, a potentiometer, and a conversion relay. When an external 24V power supply is input, eleven detection circuits can directly output the 24V point to a 15V working voltage through the 7815 three-terminal positive voltage regulator circuit, and divide the corresponding output voltage by adjusting the potentiometer to generate a normal working voltage. The other five detection circuits are used to collect two groups of U, V, and W three-phase voltages of the air-conditioning compressor and two groups of UV and VW voltages of the inverter. The detection circuits are switched through an external button switch PLC test switch (S1) and a PLC conversion switch (S2), so that the detection device can avoid false alarm faults caused by in-phase interference.

[0017] The PLC detection device can be used as a PLC maintenance emergency disposal device. The development of this device can not only ensure the stable operation of the train power system, but also avoid program switching errors caused by PLC system problems. In addition, the device is easy to operate and observe, and can intuitively find fault phenomena.

[0018] The external push button switch PLC test switch (S1) and PLC conversion switch (S2) are used to switch the detection circuit, so that the detection device can avoid false alarm faults caused by in-phase interference. The IN pin of the 7815 chip inputs +24V, the GND pin is connected to -24V, and the OUT pin is connected to the potentiometer for adjustment. From A1 to A16, they are one-way voltage, two-way voltage, DC600V main voltage, DC110V bus voltage, DC110V bus voltage, a group of U-phase current of the compressor / preheater, a group of V-phase current of the compressor / preheater, a group of W-phase current of the compressor / preheater, a group of U-phase current of the compressor / preheater, a group of V-phase current of the compressor / preheater, a group of W-phase current of the compressor / preheater, a group of U-phase current of the compressor / preheater, a group of V-phase current of the compressor / preheater, a group of W-phase current of the compressor / preheater, a DC600V leakage current, an inverter UV voltage, an inverter VW voltage, an inverter UV voltage, and an inverter VW voltage.

[0019] The present invention is formed based on a common electronic circuit structure. First, a common circuit board is used. A button PLC test switch (S1) and a PLC conversion switch (S2) are placed at the top to facilitate switching and resetting. An external 24V input power supply is placed on the right. Sixteen potentiometers are placed in the middle to facilitate voltage adjustment. Sixteen 7815 chips are placed in sequence below the potentiometers so that the received 24V power supply can be output as a stable 15V power supply, and then the potentiometer is used to divide the voltage and output it into a normal voltage of -7.5V that can be received by the PLC, so as to perform a PLC good test. The operation and processing chip is a three-terminal positive regulator 7815 chip, which can output an external 24V power supply into a stable 15V voltage for comparison and collection. After the voltage output is completed, a potentiometer is connected in parallel with it for voltage regulation. The core control part is composed of 16 core control units, which collect "one-way voltage, two-way voltage, DC600V main voltage, DC110V bus voltage, DC600V leakage current, DC110V vehicle voltage, compressor / preheater group one, two groups of three-phase current, inverter one, inverter two three-phase voltage" through the above core control unit voltage division monitoring to avoid magnetic interference caused by the magnetic field, affecting the accuracy of data monitoring.

[0020] Connect to the external PLC through the PLC communication interface, press the network communication switch to communicate, use the PLC conversion switch to convert the internal and external PLCs. The PLC inside the device provides a calibration basis for the analog output. The conversion switch can more directly detect the data difference between the external PLC and the normal PLC.

[0021] The PLC detection device uses a 220-24V switching power supply to completely simulate the 24V working voltage in the four-in-one integrated control cabinet, communicates with the gateway through the proxy node and outputs it to the PLC, and installs two PLC test switches (S1) and PLC conversion switch (S2) buttons on the main panel of the equipment. The PLC / touch screen built-in display device and the PLC analog input part are powered by the switching buttons in blocks to ensure voltage stability.

[0022] The present invention aims to improve the efficiency of PLC fault diagnosis in the prior art, reduce maintenance costs, and enhance independent maintenance capabilities. The application of the invention allows maintenance personnel to determine the specific location of the fault through the value of voltage collection, avoiding the operator being unable to repair the train due to PLC internal program failures, and avoiding the phenomenon of trains leaving the warehouse with faults. By developing the control and matching of the 7815 chip and the potentiometer, the device is prompted to collect voltage at the fault point and finally reflect it on the detection device according to the information processing function of the single-chip microcomputer.

[0023] The present invention realizes accurate detection and rapid location of PLC faults through reasonable circuit design and component matching, and can more accurately reflect the actual working status of PLC, thereby providing reliable fault diagnosis results. The device not only improves the accuracy and reliability of fault detection, but also provides an economical and efficient maintenance tool for the workshop, avoiding excessive reliance on manufacturer's proprietary equipment. In short, the present invention has significant advantages in reducing maintenance costs, improving maintenance efficiency and enhancing independent maintenance capabilities. Beneficial Effects

[0024] 1. Enhanced autonomous maintenance capability: Existing PLC fault detection usually relies on proprietary equipment and technical support provided by manufacturers, resulting in high costs and low efficiency during the maintenance process. The PLC detection device of the present invention enables maintenance personnel to independently complete fault detection and repair work through independent circuit design and operation, reducing dependence on manufacturers and improving maintenance autonomy.

[0025] 2. Low cost: Compared with expensive manufacturer-specific equipment, the detection device of the present invention uses standard electronic components, such as 7815 voltage regulator chips, potentiometers and conversion relays, which are low-cost and easy to obtain, greatly reducing the manufacturing and maintenance costs of the entire device. By reducing the reliance on expensive proprietary equipment, the present invention effectively reduces the overall maintenance cost.

[0026] 3. Easy to operate: Some detection devices in the prior art are complicated to operate and require maintenance personnel to have high-level technical capabilities. The detection device of the present invention has a simple design and a user-friendly interface. Even personnel with limited technical skills can quickly master it through simple training, making the fault detection process more efficient.

[0027] 4. Improve maintenance efficiency: Existing PLC detection equipment is often inefficient due to complex operation and lengthy detection process. The present invention significantly improves maintenance efficiency by optimizing the detection process and simplifying the operation, allowing maintenance personnel to complete fault diagnosis and repair work in a shorter time, reducing equipment downtime.

[0028] The primary problem solved by the present invention is to break the existing technical blockade and enable the workshop to independently complete the PLC maintenance task. The device can quickly and accurately locate the fault point through voltage collection and analysis functions, thereby reducing dependence on manufacturers, shortening the maintenance cycle, and reducing maintenance costs.

[0029] The PLC detection device of the present invention can collect voltage at the fault point through the control and matching of the 7815 chip and the potentiometer, and quickly determine the specific location of the fault through the information processing function of the single-chip microcomputer, effectively avoiding the train from running with a PLC fault, thereby improving the operation reliability of the train.

[0030] In addition, due to the long maintenance cycle and high maintenance difficulty caused by the prior art, the workshop has to pay high maintenance costs and cannot guarantee the efficiency of the maintenance work. This situation not only increases the operating cost of the workshop, but also affects the overall maintenance efficiency. The PLC detection device of the present invention is simple in design and easy to operate, and can efficiently complete fault detection and maintenance tasks. Through an external 24V power supply and potentiometer adjustment, the device can quickly locate and repair PLC faults, greatly improving maintenance efficiency, while significantly reducing material and maintenance costs.

[0031] Compared with the existing detection system which is easily affected by in-phase interference during operation, resulting in false alarms, the present invention avoids the problem of in-phase interference through reasonable circuit design. The detection device switches the detection circuit through an external button switch, effectively reducing the probability of false alarms. At the same time, the device is simple to operate and has an intuitive display. Maintenance personnel can directly observe the detection results, thereby quickly and accurately locating the fault point, improving the accuracy and effectiveness of maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below in conjunction with the accompanying drawings. Figure 1 It is a front view schematic diagram of the present invention, Figure 2 for Figure 1 The rear view structure diagram of Figure 3 Schematic diagram of the internal connection structure of the present invention, Figure 4 This is the circuit diagram of the PLC detection board. DETAILED DESCRIPTION

[0033] A mobile device suitable for train PLC maintenance, such as Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, it includes a shell 1, a PLC screen 2 is arranged on one side of the front of the shell 1, a PLC test switch S1, a PLC conversion switch S2, a COM1 port 5, and a COM2 port 6 are arranged on the upper part of the other side of the front of the shell 1, and a PLC communication interface 7, a network communication switch 8, an agent node interface 9, and a PLC gateway interface 10 are arranged below the COM1 port 5 and the COM2 port 6; a DC24V power supply module 11 arranged inside the shell 1 is respectively circuit-connected to a PLC detection board 12, an internal PLC 13 and a PLC screen 2, the COM1 port 5, the COM2 port 6, the PLC screen 2, the PLC communication interface 7, the PLC test switch S1, and the network communication switch 8 are respectively circuit-connected to the PLC detection board 12, the COM1 port 5 and the COM2 port 6 are respectively circuit-connected to the internal PLC 13, the network communication switch 8 is circuit-connected to the agent node interface 9, the PLC gateway interface 10 and the adapter 15 are respectively circuit-connected to the PLC screen 2, and the adapter 15 is circuit-connected to the internal PLC 13. The structure of the PLC detection board 12 is that 16 7815 chips, 16 potentiometers, 2 conversion relays, a PLC test switch S1 and a PLC test switch S2 are arranged on the circuit board, wherein the IN pin input of the first 7815 chip U1 is connected to +24V, the GND pin of the first 7815 chip U1 is connected to -24V, and the OUT pin of the first 7815U1 chip is connected to the first potentiometer A1; the IN pin input of the second 7815 chip U2 is connected to +24V, the GND pin of the second 7815 chip U2 is connected to -24V, and the OUT pin of the second 7815 chip U2 is connected to the second potentiometer A2; the IN pin input of the third 7815 chip U3 is connected to +24V, the GND pin of the third 7815 chip U3 is connected to -24V, and the OUT pin of the third 7815 chip U3 is connected to the third potentiometer A3; the IN pin input of the fourth 7815 chip U4 is connected to +24V, the GND pin of the fourth 7815 chip U4 is connected to -24V, and the OUT pin of the third 7815 chip U3 is connected to the third potentiometer A3; The pin is connected to -24V, and the OUT pin of the fourth 7815 chip U4 is connected to the fourth potentiometer A4; the IN pin input of the fifth 7815 chip U5 is connected to +24V, the GND pin of the fifth 7815 chip U5 is connected to -24V, and the OUT pin of the fifth 7815 chip U5 is connected to the fifth potentiometer A5; the IN pin input of the sixth 7815 chip U6 is connected to +24V, the GND pin of the sixth 7815 chip U6 is connected to -24V, and the OUT pin of the sixth 7815 chip U6 is connected to the sixth potentiometer A6; the IN pin input of the seventh 7815 chip U6 is connected to +24V, the GND pin of the seventh 7815 chip U7 is connected to -24V, and the OUT pin of the seventh 7815 chip U7 is connected to the seventh potentiometer A7; the IN pin input of the eighth 7815 chip U8 is connected to +24V, the GND pin of the eighth 7815 chip U8 is connected to -24V, and the OUT pin of the eighth 7815 chip U8 is connected to the eighth potentiometer A8;The IN pin input of the ninth 7815 chip U9 is connected to +24V and the output of the conversion relay K1, the normally open input of the conversion relay K1 is connected to +24V, the GND pin of the ninth 7815 chip U9 is connected to -24V, and the OUT pin of the ninth 7815 chip U9 is connected to the ninth potentiometer A9; the IN pin input of the tenth 7815 chip U10 is connected to +24V and the output of the conversion relay K1, the normally open input of the conversion relay K1 is connected to +24V, the GND pin of the tenth 7815 chip U10 is connected to -24V, and the OUT pin of the tenth 7815 chip U10 is connected to The T pin is connected to the tenth potentiometer A10; the IN pin input of the eleventh 7815 chip U11 is connected to +24V and the output of the conversion relay K1, the normally open input of the conversion relay K1 is connected to +24V, the GND pin of the eleventh 7815 chip U11 is connected to -24V, and the OUT pin of the eleventh 7815 chip U11 is connected to the eleventh potentiometer A11; the IN pin input of the twelfth 7815 chip U12 is connected to +24V, the GND pin of the twelfth 7815 chip U12 is connected to -24V, and the OUT pin of the twelfth 7815 chip U12 is connected to the The twelfth potentiometer A12; the IN pin input of the thirteenth 7815 chip U13 is connected to +24V, the GND pin of the thirteenth 7815 chip U13 is connected to -24V, and the OUT pin of the thirteenth 7815 chip U13 is connected to the thirteenth potentiometer A13; the IN pin input of the fourteenth 7815 chip U14 is connected to +24V, the GND pin of the fourteenth 7815 chip U14 is connected to -24V, and the OUT pin of the fourteenth 7815 chip U14 is connected to the fourteenth potentiometer A14; the IN pin input of the fifteenth 7815 chip U15 is connected to +24V and the output of the conversion relay K2, the normally open input of the conversion relay K2 is connected to +24V, the GND pin of the fifteenth 7815 chip U15 is connected to -24V, and the OUT pin of the fifteenth 7815 chip U15 is connected to the fifteenth potentiometer A15; the IN pin input of the sixteenth 7815 chip U16 is connected to +24V and the output of the conversion relay K2, the normally open input of the conversion relay K2 is connected to +24V, the GND pin of the sixteenth 7815 chip U16 is connected to -24V, and the OUT pin of the sixteenth 7815 chip U16 is connected to the sixteenth potentiometer A16. The PLC communication interface 7 circuit is connected to the external PLC4, and the external PLC4 circuit is connected to the PLC conversion switch S2. The proxy node interface 9 circuit is connected to the proxy node 14. The PLC gateway interface 10 circuit is connected to the PLC gateway 16. An AC24V power supply interface 3 is set on the back of the housing 1. The PLC test switch S1 controls the +24V power access of the conversion relay K1, and the PLC test switch S2 controls the +24V power access of the conversion relay K2. The internal PLC13 provides a calibration basis for the analog output. The data difference between the external PLC and the normal PLC can be detected more directly through the PLC conversion switch. ;

Claims

1. A mobile device suitable for train PLC maintenance, comprising a housing (1), characterized in that: A PLC screen (2) is arranged on one side of the front of the housing (1); a PLC test switch (S1), a PLC conversion switch (S2), a COM1 port (5), and a COM2 port (6) are arranged on the upper part of the other side of the front of the housing (1); a PLC communication interface (7), a network communication switch (8), an agent node interface (9), and a PLC gateway interface (10) are arranged below the COM1 port (5) and the COM2 port (6); a DC24V power supply module (11) arranged inside the housing (1) is respectively connected to a PLC detection board (12), an internal PLC (13) and the PLC screen (2), the COM1 port (5), the COM2 port (6), the PLC screen (2), the PLC communication interface (7), the PLC test switch (S1), and the network communication switch (8) are respectively connected to the PLC detection board (12) circuit, the COM1 port (5) and the COM2 port (6) circuits are connected to the internal PLC (13), the network communication switch (8) circuit is connected to the proxy node interface (9), the PLC gateway interface (10) and the adapter (15) are respectively connected to the PLC screen (2) circuit, and the adapter (15) circuit is connected to the internal PLC (13).

2. The mobile device for train PLC maintenance according to claim 1 is characterized in that: The structure of the PLC detection board 12 is that 16 7815 chips, 16 potentiometers, 2 conversion relays, a PLC test switch (S1) and a PLC test switch (S2) are arranged on the circuit board, wherein the IN pin input of the first 7815 chip (U1) is connected to +24V, the GND pin of the first 7815 chip (U1) is connected to -24V, and the OUT pin of the first 7815 (U1) chip is connected to the first potentiometer (A1); the IN pin input of the second 7815 chip (U2) is connected to +24V, the GND pin of the second 7815 chip (U2) is connected to -24V, and the OUT pin of the second 7815 chip (U2) is connected to the second potentiometer (A2); the third 7815 chip (U2) is connected to +24V, the GND pin of the second 7815 chip (U2) is connected to -24V, and the OUT pin of the second 7815 chip (U2) is connected to the second potentiometer (A2); The IN pin input of the 815 chip (U3) is connected to +24V, the GND pin of the third 7815 chip (U3) is connected to -24V, and the OUT pin of the third 7815 chip (U3) is connected to the third potentiometer (A3); the IN pin input of the fourth 7815 chip (U4) is connected to +24V, the GND pin of the fourth 7815 chip (U4) is connected to -24V, and the OUT pin of the fourth 7815 chip (U4) is connected to the fourth potentiometer (A4); the IN pin input of the fifth 7815 chip (U5) is connected to +24V, the GND pin of the fifth 7815 chip (U5) is connected to -24V, and the OUT pin of the fifth 7815 chip (U5) is connected to the fifth potentiometer (A5) ; The IN pin input of the sixth 7815 chip (U6) is connected to +24V, the GND pin of the sixth 7815 chip (U6) is connected to -24V, and the OUT pin of the sixth 7815 chip (U6) is connected to the sixth potentiometer (A6); The IN pin input of the seventh 7815 chip (U6) is connected to +24V, the GND pin of the seventh 7815 chip (U7) is connected to -24V, and the OUT pin of the seventh 7815 chip (U7) is connected to the seventh potentiometer (A7); The IN pin input of the eighth 7815 chip (U8) is connected to +24V, the GND pin of the eighth 7815 chip (U8) is connected to -24V, and the OUT pin of the eighth 7815 chip (U8) is connected to the eighth potentiometer (A8); the IN pin input of the ninth 7815 chip (U9) is connected to +24V and the output of the conversion relay (K1), the normally open input of the conversion relay (K1) is connected to +24V, the GND pin of the ninth 7815 chip (U9) is connected to -24V, and the OUT pin of the ninth 7815 chip (U9) is connected to the ninth potentiometer (A9); the IN pin input of the tenth 7815 chip (U10) is connected to +24V and the output of the conversion relay (K1), the normally open input of the conversion relay (K1) is connected to +24V, the GND pin of the tenth 7815 chip (U10) is connected to -24V, and the OUT pin of the tenth 7815 chip (U10) is connected to the tenth potentiometer (A10);The IN pin input of the eleventh 7815 chip (U11) is connected to +24V and the output of the conversion relay (K1), the normally open input of the conversion relay (K1) is connected to +24V, the GND pin of the eleventh 7815 chip (U11) is connected to -24V, and the OUT pin of the eleventh 7815 chip (U11) is connected to the eleventh potentiometer (A11); the IN pin input of the twelfth 7815 chip (U12) is connected to +24V, and the OUT pin of the twelfth 7815 chip (U12) is connected to +24V. The GND pin of the twelfth 7815 chip (U12) is connected to -24V, and the OUT pin of the twelfth 7815 chip (U12) is connected to the twelfth potentiometer (A12); the IN pin of the thirteenth 7815 chip (U13) is connected to +24V, the GND pin of the thirteenth 7815 chip (U13) is connected to -24V, and the OUT pin of the thirteenth 7815 chip (U13) is connected to the thirteenth potentiometer (A13); the IN pin of the fourteenth 7815 chip (U14) is connected to +24V, the GND pin of the thirteenth 7815 chip (U14) is connected to -24V, and the OUT pin of the thirteenth 7815 chip (U14) is connected to the th The pin input is connected to +24V, the GND pin of the fourteenth 7815 chip (U14) is connected to -24V, and the OUT pin of the fourteenth 7815 chip (U14) is connected to the fourteenth potentiometer (A14); the IN pin input of the fifteenth 7815 chip (U15) is connected to +24V and the output of the conversion relay (K2), the normally open input of the conversion relay (K2) is connected to +24V, the GND pin of the fifteenth 7815 chip (U15) is connected to -24V, and the OUT pin of the fifteenth 7815 chip (U15) is connected to the fifteenth potentiometer (A15); the IN pin input of the sixteenth 7815 chip (U16) is connected to +24V and the output of the conversion relay (K2), the normally open input of the conversion relay (K2) is connected to +24V, the GND pin of the sixteenth 7815 chip (U16) is connected to -24V, and the OUT pin of the sixteenth 7815 chip (U16) is connected to the sixteenth potentiometer (A16). ; 3. The mobile device for train PLC maintenance according to claim 1 is characterized in that: The PLC communication interface (7) circuit is connected to the external PLC (4), and the external PLC (4) circuit is connected to the PLC conversion switch (S2).

4. The mobile device for train PLC maintenance according to claim 1 is characterized in that: The proxy node interface (9) circuit is connected to the proxy node (14).

5. The mobile device for train PLC maintenance according to claim 1 is characterized in that: The PLC gateway interface (10) circuit is connected to the PLC gateway (16).

6. The mobile device for train PLC maintenance according to claim 1 is characterized in that: An AC24V power interface (3) is provided on the back of the housing (1).

7. The mobile device for train PLC maintenance according to claim 2 is characterized in that: The PLC test switch (S1) controls the +24V power access of the switching relay (K1), and the PLC test switch (S2) controls the +24V power access of the switching relay (K2).

8. The mobile device for train PLC maintenance according to claim 1 is characterized in that: The internal PLC (13) provides a calibration basis for the analog output. The PLC conversion switch can more directly detect the data difference between the external PLC and the normal PLC.

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