为了避免其它设备的电干扰，可编程控制器应尽可能远离高压电源线和高压设备，可编程控制器与高压设备和电源线之间应留出至少200mm的距离。
3、收卷单独张力控制。
由于PLC内部混入导电性异物或受外部异常噪音的影响，导致CPU失控或运算周期超过200ms，则WDT出错，［EPROR］LED灯亮，PLC处于STOP，同时输出全部都变为OFF。此时可进行断电复位，若PLC恢复正常，请检查一下有无异常噪音发生源和导电性异物混入的情况。另外，请检查PLC的接地是否符合要求。
1）硬件模拟法是使用一些硬件设备（如用另一台PLC或一些输入器件等）模拟产生现场的信号，并将这些信号以硬接线的方式连到PLC系统的输入端，其时效性较强。
常用的两种编程语言，一是梯形图，二是助记符语言表。采用梯形图编程，因为它直观易懂，但需要一台个人计算机及相应的编程软件；采用助记符形式便于实验，因为它只需要一台简易编程器，而不必用昂贵的图形编程器或计算机来编程。
PLC的性能倚赖于专用的硬件，PLC的应用程序是依靠专用的硬件芯片来实现的，对于PLC的功能的改进，如增加运动控制、过程控制或通讯功能，都需要使用不同的硬件。即使对于同一PLC厂家，这种专用的硬件很难移植到不同性能的PLC中。而且传统的PLC厂家的硬件结构体系都是专有的设计，甚至于处理器芯片都是专用的，这样就导致了随着PLC功能需求的不断提高，PLC的硬件体系变得越来越复杂。
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