描述
在PLC控制系统中，需要显示的内容主要有计时器值、计数器值和数据寄存器值，数据显示方法可归纳为两种基本类型:一类为基于PLC数据通信接口，如RS-232,RS-485/422，显示装置也具有此类接口，通过数据通信方式实现数据显示。
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