Plant control system

摘要: In a plant control system, transmission channel includes loop lines arranged in duplex. Equivalently connected to this are plurality of one-loop controller stations, backup station backing up disabled one the plural stations and display for displaying status station. Each built-in microcomputer. these also interface circuit self-diagnostic circuit. The each selects data between its own others. detects presence failure normal operation disconnects from line, so that other may not be adversely affected by