PLC輸出線圈Y0為首的2個字節的數據為例，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個字節的數據即為Y0-Y7和Y10-Y17，根據返回的數據，就可以知道PLC此時的狀態，以實現對PLC的監控。在每一次讀操作之前，先要進行握手聯絡。對PLC發請求訊號ENQ，然后讀PLC的響應訊號。如果讀到的響應訊號為ACK，則表示PLC已準備就緒，等待接收通訊數據。 
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