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數據存儲器的串行口直接與S7-200PLC的RS-232/485口進行通訊,在自由端口模式下,PLC的串行通信接口由用戶來控制,PLC相當于從站,數據存儲器相當于主站。除了自發向數據存儲器發送報警信息和連接保持信息外,一般都是接收到數據返回請求后,再向數據存儲器發送數據。PLC接收完數據存儲器發送來的數據后,觸發端口0接收完成中斷對數據包進行分析。如果是巡檢命令,則將實時采樣數據存儲到巡檢數據寄存器中,然后調用PackandSend子程序,設置好寄存器地址即可按照命令返回相應數據。PLC發送完成后觸發端口0發送完成中斷,將各標志位寄存器復位,為下一次通信做準備。
a)通信程序的實現
(1)根據用戶的具體需求,數據存儲器可主動發送輪詢指令。采用串行口工作方式以數據存儲器作為主機,向PLC進行呼叫,定期讀取數據或者寫入數據;將PLC返回的監控數據保存在SD卡中。其程序流程圖參見圖2。
LC返回的監控數據保存在SD卡中流程圖1
LC返回的監控數據保存在SD卡中流程圖2
單片機端通訊程序流程圖
(2)PLC端程序流程圖的實現。PLC端作為從機,采用梯形圖或者STL編程,主要是先設置通訊協議,然后按照協議把采集到的數據進行處理,再發送給主機數據存儲器,其具體的程序流程圖如圖3所示。
單片機端通訊程序流程圖
單片機端通訊程序流程圖
單片機端通訊程序流程圖
PLC端通訊程序流程圖
數據分析
通過讀卡器將SD卡中的監測數據導入電腦軟件中,電腦軟件根據實際業務需要設計相應的算法,對數據進行分析,以數據報表,圖表等方式展現結果。
文中所述方案可以準確、可靠地測量惡劣環境下的現場數據并存儲。數據存儲器和PLC的采用不僅增大了系統的穩定性,而且還可以很方便地根據實際需要適當地增加或改變監控對象,對系統功能進行擴展。由于都采用模塊化設計,所以對系統進行簡單修改后即可用于其他工業監控應用中。實驗表明,該方法能夠穩定可靠地采集和存儲數據,為中小規模監測系統
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