PLCS7在苯酐装置切换系统中的应用

摘要

针对苯酐装置顺序控制系统原S5—155H程控器的不足，将其全面升级为能实现冗余、容错功能的S7—400H程控器，解决了因控制系统故障而导致装置停车的隐患。%Aimed at problems of the sequence control system in phthalic anhydride unit. The original S5 -155H programmable controller was replaced by S7 -400H with the function of redundancy and fault - tolerance. Potential hazard of shutdown caused by the failure of the control system was avoided.