PCM-087;
供应PCM-087;
PCM-087;
PLC控制系统与继电器控制系统相比,有许多相似之处,也有许多不同。不同之处主要在以下几个方面:包括控制方法、工作方式、控制速度、定时和计数控制。
(1)从控制方法上看,电器控制系统控制逻辑采用硬件接线,利用继电器机械触点的串联或井联等组合成控制逻辑,其连线多且复杂、体积大、功耗大,系统构成后,想再改变或增加功能较为困难。另外,继电器的触点数量有限,所以电器控制系统的灵活性和可扩展性受到很大限制。而PLC采用了计算机技术,其控制逻辑是以程序的方式存放在存储器中,要改变控制逻辑只需改变程序,因而很容易改变或增加系统功能。系统连线少、体积小、功耗小,而且PLC的“软继电器”实质上是存储器单元的状态,所以“软继电器”的触点数*是无限的,PLC系统的灵活性和可扩展性好。
(2)从工作方式上看,在继电器控制电路中.当电源接通时,电路中所有继电器都处于受制约状态,即该吸合的继电器都同时吸合.不该吸合的继电器受某种条件限制而不能吸合,这种工作方式称为并行工作方式。而PLC的用户程序是按一定顺序循环执行的,所以各软继电器都处于周期性循环扫描接通中,受同一条件制约的各个继电器的动作次序决定于程序扫描顺序,这种工作方式称为串行工作方式。
(3)从控制速度上看,继电器控制系统依靠机械触点的动作以实现控制,工作孩率低.机械触点还会出现抖动问题。而PLC通过程序指令控制半导体电路来实现控制,速度快,程序指令执行时间在微秒级,且不会出现触点抖动间题。
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