PLC輸出線圈Y0為首的2個字節(jié)的數(shù)據(jù)為例，編寫一個通信程序。查PLC軟元件地址表可知，輸出線圈Y0的首地址為00A0H，2個字節(jié)的數(shù)據(jù)即為Y0-Y7和Y10-Y17，根據(jù)返回的數(shù)據(jù)，就可以知道PLC此時的狀態(tài)，以實現(xiàn)對PLC的監(jiān)控。在每一次讀操作之前，先要進(jìn)行握手聯(lián)絡(luò)。對PLC發(fā)請求訊號ENQ，然后讀PLC的響應(yīng)訊號。如果讀到的響應(yīng)訊號為ACK，則表示PLC已準(zhǔn)備就緒，等待接收通訊數(shù)據(jù)。 
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