厦门仲鑫达科技有限公司

  PLC输出线圈Y0为首的2个字节的数据为例，编写一个通信程序。查PLC软元件地址表可知，输出线圈Y0的首地址为00A0H，2个字节的数据即为Y0-Y7和Y10-Y17，根据返回的数据，就可以知道PLC此时的状态，以实现对PLC的监控。在每一次读操作之前，先要进行握手联络。对PLC发请求讯号ENQ，然后读PLC的响应讯号。如果读到的响应讯号为ACK，则表示PLC已准备就绪，等待接收通讯数据。 
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