Woodhead SST-PFB-REL

Woodhead SST-PFB-REL通訊處理

采用兩個LM3109實現(xiàn)室內機與室外機的數據交換需要進行通訊方面的配置以及程序編寫，PowerPro2.1.4帶有通訊功能庫，并且完全支持IEC61131-3的六種語言，使得這種比較復雜的通訊過程，能夠在PLC中方便的實現(xiàn)。通訊程序的流程圖如下所示，這里采用Modbus RTU通訊協(xié)議，在室外機首先初始化RS485接口的波特率、數據位、校驗位、停止位等參數，再初始化其為Modbus從站，并且設置Modbus從站地址。調用圖3-2中的通訊初始化功能塊即可完成Modbus從站的初始化工作。后要做的就是把從機中的狀態(tài)信息有規(guī)律的放到LM的可尋址區(qū)M區(qū)中，以備主機讀取。LM的編程軟件PowerPro支持ST語言，可以方便的處理需要交換的數據。在圖3-3中程序采用ST語言編寫，作用是把壓縮機、冷凝風機等的狀態(tài)信息賦值給了%MX1405.0~%MX1405.7這些數據位，主機通過讀取這些地址內的數值就可以獲得室外機的狀態(tài)信息，可以看到數據處理很方便，程序的可讀性也很高，在調試的時候各個數據的狀態(tài)一目了然。

Woodhead SST-PFB-REL

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