描述
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。掌握PLC性能,一定要了解它的模块,并通过了解模块的性能,去弄清楚PLC的性能。
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