摘 要： 本文以某鋁業公司碳素廠陽極石油焦轉運系統為例, 介紹了美國A-B SLC505可編程序控制器（PLC）和上位機監控軟件RSview系統的應用。給出了一種經濟、可靠、易于維護的控制系統方案，闡述了控制系統的結構和控制功能的實現。
關鍵詞： PLC；在線切換；上位機；自動停車保護；脈沖振打
Abstract This article introduced application of A-B SLC505 Programmable Logic Controller and RSview software on petrol-coke transit system in carbon plant of one aluminium company. The article shows the structure and successful use of this control system which has proved to be economic，reliable and easily for maintenance.
Key words PLC；Online switch；Host computer；Auto-stop protection；Pulse beate
0 引言
隨著工業企業自動化技術的發展，PLC (Programmable Logic Controller,又稱可編程控器)，以其可靠性、靈活性、優良的性能價格比、使用方便等特點在工業控制領域迅猛發，得到了越來越廣泛的應用。
石油焦是鋁電解用碳素陽極生產的主要原料。石油焦轉運系統，是把貯存在倉庫中的石油焦，經過破碎篩分處理成滿足煅燒需要的原料，輸送到煅前料倉。由于該系統邏輯控制點多、自動化程度高、上下游設備間關聯度大，所以選用PLC進行自動控制，并設立上位機進行全系統監控。本文著重討論PLC在系統中控制功能的實現和上位機監控界面的開發。
1 工藝介紹
石油焦轉運站系統主要由天車抓料系、破碎篩分系、提升系、分料輸送系、收塵系組成。用來滿足煅燒窯系統煅前日用料倉物料供給。主要抓料天車、調速皮帶、破碎機、篩分機、輸送皮帶、斗式提升機、分料擋板等設備組成。其中破碎篩分系、提升系是兩套系統，破碎篩分系統可以一備一用，也可以同時工作；提升系實現設備一備一用。工藝流程簡圖見下圖1.
圖1石油焦轉運站工藝流程簡圖
2 控制系統設計及實現
2.1 SLC500的特點
SLC500模塊化可編程控制器及輸入輸出模塊由羅克韋爾自動化公司生產，產品目錄號為1746和1747系列。該系列產品采用框架式結構，為在不同的工業現場使用提供了同樣穩定可靠的平臺。SLC500系統構成處理器、輸入輸出模塊和相關外部設備。處理器功能強大、使用靈活，并有各種內置通訊方式和不同容量的內存供用戶按需選擇。根據用戶的實際需要，輸入輸出模塊可以非常方便的擴展。同時羅克韋爾自動化提供了便捷的內置通訊接口、種類豐富的第三方專用模塊、簡單方便的基于WINOOWs平臺的編程軟件。因而SLC500成為當前市場上最為流行的中小型PLC之一。 2.2 硬件配置
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