浅析PLC梯形图与继电器控制线路的差别

Brief Analysis of Differences Between PLC Ladder Chart and Relay Control Circuit

文章分析了PLC程序与继电器线路工作原理的差别,并用举例的方法说明照搬成熟的继电器控制线路进行PLC编程或照搬PLC程序连接继电器控制线路,都不能实现需要的逻辑功能。

While it analyzes the different working principles between PLC ladder chart and the relay circuit , the paper illustrates the reason why it is unable to perform its logic function by copying the relay control circuit for PLC programming or the PLC program for the relay control circuit .