可编程序控制器中辅助继电器的运用

The Application of Auxiliary Relay in Programmable Logic Controller

辅助继电器是可编程序控制器(PLC)内部软元件之一,它们在PLC编程中可以承担不同的角色,起到不同的作用,通常可在顺序控制程序中起传递作用、指令程序中起开关作用、程序架构中起指定代身作用。

Auxiliary relay is one of the internal devices of Programmable logic Controller（ PLC）. It assumes different responsibilities and plays different roles in PLC programming. In sequential control program,it operates the transfer function; in instruction program,it plays a role of switch; in the framework of program,it plays a part of the designated representative body.