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搞自动化PLC必备的基础知识汇总!
1、从PLC的组成来看,除CPU,存储器及通信接口外,与工业现场直接有关的还有哪些接口?并说明其主要功能。 1)输入接口:接受被控设备的信号,并通过光电耦合器件和输入电路驱动内部电路接通或断开。 2)输出接口:程序的执行结果通过输出接口的光电耦合器件和 ...
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