摘要
可编程序控制器（ＰＬＣ）是一种工业控制计算机。简略介绍了ＰＬＣ的产生与发展；阐述了自八十所代后期以来它在技术上的新进展以及它向过程控制领域扩展形成ＰＬＣ型集散控制系统所需解决的某些主要技术问题。
Programmable controller(PLC)is an industrial control computer.The emergenceand development of PLC is intreduced briefly,its recent advancement in techniques is descritged,and some main technical problems which have to be solved in the course of PLC extending to thefield of process control for forming distributed control systein of PLC type are aiso discussed.
关键词
程序控制器
微处理器
集散型
控制系统
PLC
microprocessor
preease,control
distributed control system
communicationprotocol
PID control
