57160001-ADF ABB

PLC control system failure refers to the loss of specified functions,generally refers to the total failure of the entire production control system,which can be divided into two parts:PLC failure and field production control equipment failure.The PLC system includes the central processing unit,the main chassis,the expansion chassis,I/O modules and related network and external devices.Field production control equipment includes ports and field control testing equipment,such as relays,contactors,valves,motors,etc.

PLC控制系统故障是指其失去了规定功能，一般指整个生产控制系统失效的总和，它又可分为PLC故障和现场生产控制设备故障两部分。PLC系统包括中央处理器、主机箱、扩展机箱、I/O模块及相关的网络和外部设备。现场生产控制设备包括端口和现场控制检测设备，如继电器、接触器、阀门、电动机等。