6GK7343-1CX00-0XE0
根據前述控制要求,在充分考慮了系統的可靠性、穩定性、通用性基礎上,確定本監控系統采用集中式的控制結構,分為3級:過程監控站、PLC控制器和現場電氣驅動和信號檢測。
PLC控制器選用西門子SIMATIC S7-300,該型PLC技術成熟可靠,應用廣泛,具有功能強、速度快、模塊化等特點,具體配置為:CPU314,帶有MPI接口,配64k EPROM存儲卡做程序掉電保護;16通道DI模塊SM321,5個;16通道DO模塊SM322,3個;8通道AI模塊SM331,2個;
4通道AO模塊SM332,1個;考慮系統的總點數和今后擴展的需要,配置了1個擴展機架,主機架和擴展機架之間通過通信模塊IM360和IM361通信。監控站采用研華工控機,運行澳大利亞的CitectSCADA過程監控組態軟件。S7-300和監控站計算機的通信采用MPI接口,在上位機中安裝CP5613通訊卡,通過MPI電纜進行連接。
4 PLC控制功能設計
PLC程序是實現整個系統功能的核心,設計內容較多,下面主要介紹生產設備的起停聯鎖邏輯控制和破碎機恒定負荷控制。
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