Woodhead SST-PFB-REL

Woodhead SST-PFB-REL通訊處理

采用兩個(gè)LM3109實(shí)現(xiàn)室內(nèi)機(jī)與室外機(jī)的數(shù)據(jù)交換需要進(jìn)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(fù)雜的通訊過程，能夠在PLC中方便的實(shí)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(jī)首先初始化RS485接口的波特率、數(shù)據(jù)位、校驗(yàn)位、停止位等參數(shù)，再初始化其為Modbus從站，并且設(shè)置Modbus從站地址。調(diào)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(jī)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(jī)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(shù)據(jù)。在圖3-3中程序采用ST語言編寫，作用是把壓縮機(jī)、冷凝風(fēng)機(jī)等的狀態(tài)信息賦值給了%MX1405.0~%MX1405.7這些數(shù)據(jù)位，主機(jī)通過讀取這些地址內(nèi)的數(shù)值就可以獲得室外機(jī)的狀態(tài)信息，可以看到數(shù)據(jù)處理很方便，程序的可讀性也很高，在調(diào)試的時(shí)候各個(gè)數(shù)據(jù)的狀態(tài)一目了然。

Woodhead SST-PFB-REL

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