PCD231B
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。
   除了模块，PLC还有外部设备。
   尽管用PLC实现对系统的控制可不用外部设备，配置好合适的模块就行了。然而，要对PLC编程，要监控PLC及其所控制的系统的工作状况，以及存储用户程序、打印数据等，就得使用PLC的外部设备。故一种PLC的性能如何，与这种PLC所具外部设备丰富与否，外部设备好用与否直接相关。


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