描述
PLC还有特殊的或称智能或称功能模块。如A/D（模入）模块、D/A（模出）模块、高速计数模块、位控模块、温度模块等等。这些模块有自己的CPU，可对信号作预通讯模块，它接人PLC后，可使PLC与计算机，或PLC与PLC进行通讯，有的还可实现与其它控制部件，如变频器、温控器通讯，或组成局部网络。通讯模块代表PLC的组网能力，代表着当今PLC性能的重要方面
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