AB第三方模塊ILX69-PBS_廈門光沃自動化設備有限公司

ILX69-PBS

通信程序的工作過程：PC每發送一個字節前首先發送握手信號，PLC收到握手信號後將其傳送回PC，PC只有收到PLC傳送回來的握手信號後才開始發送一個字節數據。PLC收到這個字節數據以後也將其回傳給PC，PC將原數據與PLC傳送回來的數據進行比較，若兩者不同，則說明通信中發生了誤碼，PC機重新發送該字節數據;若兩者相同，則說明PLC收到的數據是正確的，PC機發送下一個握手信號，PLC收到這個握手信號後將前一次收到的數據存入指定的存儲區。這個工作過程重復一直持續到所有的數據傳送完成。

採用軟件握手以後，不管PC與PLC的速度相差多遠，發送方也不會超前於接收方。軟件握手的缺點是大大降低了通信速度，因為傳送每一個字節，在傳送線上都要來回傳送兩次，並且還要傳送握手信號。但是考慮到控制的可靠性以及控制的時間要求，犧牲一點速度是值得的，也是可行的。

PLC方的通信程序只是PLC整個控制程序中的一小部分，可將通信程序編制成PLC的中斷程序，當PLC接收到PC發送的數據以後，在中斷程序中對接收的數據進行處理。PC方的通信程序可以採用VB、VC等語言，也可直接採用西門子組態軟件，如STEP7、WinCC。

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