基于西门子S7-200PLC顺序控制编程方法研究

THE TESEARCH OF SEQUENTIAL CONTROL PROGRAMMING METHODS BASED ON SIEMENS S7-200 PLC

以西门子S7-200PLC为例,介绍了两种典型的顺序控制程序设计方法,通过比较,指出了S/R指令和步进指令在设计PLC顺序控制程序时所具有的不同特点。实验结果表明,利用顺序功能图来编制用户控制程序,以实现单台设备或生产过程的顺序控制,使得PLC编程有规章可循,简单易学。

In this paper, we first introduce two typical design methods of sequential control program based on S7-200 PLC for Siemens, and then we point out the instruction difference between S/R and Sequence Control Relay （SCR） by comparison. Experimental results show that it has ability in realizing sequential control on single device or production process and it is also easy for the beginner to learn programming by using SFC （Sequential Function Chart）.