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07KT98E2
07KT98E2
07KT98E2
问] :
可编程序控制器(PLC)中的“输出继电器”与其“继电器输出”有何内在联系?
[答] :
可编程序控制器(PLC)在采用梯形图作为编程语言时,梯形图中的“输出继电器”仅是一种形象化的“软继电器”,PLC通过它来起到输出控制作用,当其满足接通条件时,对应的输出可即有输出信号。实施输出的硬件,则可能是能输出开关量信息的三极管、双向晶闸管。当PLC采用继电器输出时,是以继电器的触点来执行梯形图中“输出继电器”的输出指令。因此,并不是说PLC的“输出继电器”只能用继电器输出的模式。
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