57418-E PLC模块说明
PLC的用户程序可以在实验室模拟调试，输入信号用小开关来模拟，通过PLC上的发光二极管可观察输出信号的状态。完成了系统的安装和接线后，在现场的统调过程中发现的问题一般通过修改程序就可以解决，系统的调试时间比继电器系统少得多。
5、编程方法简单
梯形图是使用得*多的可编程序控制器的编程语言，其电路符号和表达方式与继电器电路原理图相似，梯形图语言形象直观，易学易懂，熟悉继电器电路图的电气技术人员只要花几天时间就可以熟悉梯形图语言，并用来编制用户程序。
梯形图语言实际上是一种面向用户的一种高级语言，可编程序控制器在执行梯形图的程序时，用解释程序将它“翻译”成汇编语言后再去执行。
6、维修工作量少，维修方便
PLC的故障率很低，且有完善的自诊断和显示功能。PLC或外部的输入装置和执行机构发生故障时，可以根据PLC上的发光二极管或编程器提供的住处迅速的查明故障的原因，用更换模块的方法可以迅速地排除故障。
7、体积小，能耗低
对于复杂的控制系统，使用PLC后，可以减少大量的中间继电器和时间继电器，小型PLC的体积相当于几个继电器大小，因此可将开关柜的体积缩小到原来的确1/2-1/10。
PLC的配线比继电器控制系统的配线要少得多，故可以省下大量的配线和附件，减少大量的安装接线工时，可以减少大量费用。
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