Mitsubishi PLC is widely used in digital control systems. At present, equipment long-distance control plays an important role in long-distance data collection, PLC long-distance fault diagnosis, and PLC long-distance programming. This paper takes the long-distance control of Mitsubishi PLC as an example, and uses the HiNet intelligent gateway of Huachen Zhitong in the long-distance control of equipment.
In this use case, the user wants to visit and correct the working status of the PLC distributed around the world through any computer that can be connected to the Internet, solve the hidden danger of PLC failure in time, avoid the trouble of the user needing to go to the site to confirm the diagnosis, and save the cost of operation and maintenance and after-sales.
A fault diagnosis method for Mitsubishi PLC based on HiNet intelligent gateway
The overall plan for long-distance fault diagnosis of the entire PLC includes HiNet intelligent gateway, HiCloud cloud monitoring server, Hinode WindowsClient client software and host computer software.
The HiNet intelligent gateway is used as the data collection terminal, and the HiNet intelligent gateway is used as the network communication entrance of the on-site PLC equipment, and the on-site equipment is connected to the Internet and cloud platform network through wired, WiFi, 3G and other communication methods.
The Hionde client of the monitoring terminal device completes the long-distance link with the on-site HiNet intelligent gateway, completes the localization operation of the remote PLC, and relies on the PLC programming of the monitoring terminal step7 MicroWin, WINCC and other PLC or the host computer software to complete the basic functions of the remote PLC, such as long-distance programming, fault diagnosis, online simulation, long-distance data collection, and long-distance control of the equipment.
System features:
1) Strong compatibility: HiNet intelligent gateway has a variety of communication interfaces, which can use GPRS, 3G, 4G, WiFi and Ethernet and other communication methods, and can be compatible with RS422/232/485, RJ45 and other interfaces.
2) High security: In order to ensure the security of the data and the stability of the server, the VPN overP2P special security channel is adopted, which can not only ensure that the PLC data is transmitted in isolation from the general Internet data, but also ensure that the PLC data is directly transmitted to the monitoring room without going through the cloud server, which not only reduces the load of the cloud server, but also further ensures the security of the PLC data.
3) Fault warning: the equipment has the function of fault warning and diagnosis, and can be given an alarm through SMS, email and other methods after reaching the alarm threshold (early warning parameters and alarm thresholds can be set by the user himself).
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