Improve the performance of the catenary control component The control component of the phosphating 2nd floor catenary is based on OmronC200H series PLC control components. The control core CPU01 module has a single function and does not have the most basic serial port communication capabilities. Program maintenance uses a handheld programmer, the display is small, and the operation is cumbersome. The PLC is now upgraded to C200HE series CPU42 type, which has a standard serial port communication capabilities, faster scanning cycle, and with the Omron series PLC special tool software CPT, SSS and so on. It greatly facilitates the daily software maintenance work, and can display the changes of I/O points in a dynamic, human-machine large-screen interactive manner. It also provides a powerful and perfect monitoring foundation for the host computer.

The development of the dynamic monitoring system across the board uses the host computer and TV screens to achieve the dynamic monitoring of the primer line. The system adopts an industrial control microcomputer-based control method, taking into account the integrated control method supplemented by PLC and video matrix control, and completes the real-time monitoring of multiple screens of all equipment. In addition, the television is used to complete the dynamic display task of 9 critical fault points on the catenary, 9 screens can be converted into 4 and 1 screens, and scroll display can be set and any screen can be switched.

Data acquisition for switching The I/O board is installed on the host computer. It is mainly used in pre-processing systems that do not use PLCs, and cannot communicate with the host computer through the communication capabilities of the PLC. By adding four I/O boards, the center is aligned. The existing switch in the control console performs data acquisition so that the state of the electrophoresis preprocessing equipment can be reflected on the terminal monitor intuitively.

System Design Implementation Method and Effects The industrial computer in the system undertakes tasks such as field data collection, fault analysis, dynamic display, video display, data processing, and data communication with the PLC (1). Here chooses the upper computer configuration to be Advantech, P3/1G, 21 monitors. The PLC (OmronC200HE) used after the upgrade of the catenary is equipped with a standard RS-232 communication port, which can communicate with the host computer's communication ports RS-232, RS-422 (RS-232RS422 adapter). The differences between the interface standards are shown in Figure 1.

A comparison of the interface standards can be seen from the comparison, RS232 bus working mode is unbalanced, in the interference and long distance, the transmission of data is not accurate, so the rate decline, for scalability, RS232 can only point to point transmission, and RS422 More flexible and multi-point transmission.

In order to achieve higher stability, longer transmission distance, better scalability, greater transmission rate, and to meet future development needs, RS422 bus mode is more suitable, and PLC provides RS232 interface by RS232 The electrical characteristics of the RS422 are shown in Figure 2.

The data communication system does not have excessive requirements for the communication method. Therefore, an optimized and economical communication method is adopted, namely, the Hostlink system [4]. This system communicates the host computer via communication between the host computer and the PC. In response to the response, the number of commands or responses exchanged at a time is one frame and contains a maximum of 131 data characters. The command format is shown as 2.

2 Exchange command format between host computer and PC The Hostlink system allows a host computer to send commands to the PLC of the Hostlink system through a host computer link command. The PLC processes each command from the host computer and returns the result to the host computer.

Host computer monitoring: The host computer can transfer or read the PLC program, and can read and write the PLC data area.

Dual inspection system: All communications will be checked for parity and frame, so that errors in the communication can be estimated.

On the one hand, the realization of the video and the video signal is to sample the nine key points of the catenary from the on-site 9-channel camera, output on the TV by the 9-channel picture splitter, as the main monitoring, on the other hand, the key points of the 9-sampling video are made from 10 channels. The image conversion matrix device is input to the video card of the host computer, and is monitored and controlled by the video playback software. The control of the image is performed by the RS-485 control interface provided by the matrix device and the RS-232 of the host computer, due to the difference in interface characteristics. As shown in 3.

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