07AI91 ABB

From the 1980s to the mid-1990s,PLC was the fastest growing period,with an annual growth rate of 30-40%.During this period,PLC’s ability to process analog quantities,digital computing,man-machine interface and network has been greatly improved,and PLC has gradually entered the field of process control,replacing the dominant DCS in the field of process control in some applications.system.

PLC has the characteristics of strong versatility,convenient use,wide adaptability,high reliability,strong anti-interference ability,and simple programming.The position of PLC in industrial automation control,especially sequence control,cannot be replaced in the foreseeable future.

上世纪80年代至90年代中期，是PLC发展最快的时期，年增长率一直保持为30~40%。在这时期，PLC在处理模拟量能力、数字运算能力、人机接口能力和网络能力得到大幅度提高，PLC逐渐进入过程控制领域，在某些应用上取代了在过程控制领域处于统治地位的DCS系统。

PLC具有通用性强、使用方便、适应面广、可靠性高、抗干扰能力强、编程简单等特点。PLC在工业自动化控制特别是顺序控制中的地位，在可预见的将来，是无法取代的。