描述
PLC的外设很丰富，编程器种类很多，用起来都较方便，还有数据监控器，可监控PLC的工作。使用PLC的软件也很多，不仅可用类似于继电电路设计的梯形图语言，有的还可用BASIC语言、C语言，以至于自然语言。这些也为PLC编程提供了方便。
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