【正文】 r, PLC not only can plete plex relay logic control, and can plete the analog control and intelligent control, and can realize the remote munications, working, puter monitoring. Key words: power plant。 PLC 在火力發(fā)電廠輸煤控制系統(tǒng)應(yīng)用的實踐證明： PLC是實現(xiàn)火電廠熱工自動化的理想控制器， PLC 不但能完成復(fù)雜的繼電器邏輯控制，而且能完成模擬量控制及智能控制，并能實現(xiàn)遠(yuǎn)程通訊、聯(lián)網(wǎng)、上位機(jī)監(jiān)控等。 MCGS 2 目 錄 1 S7200西門子 PLC概述 ................................................................................................ 3 S7200 PLC的結(jié)構(gòu)及技術(shù)性能 ........................................................................... 3 S7200 CPU的結(jié)構(gòu) ............................................................................. 3 S7200 CPU 22X 的電源 .......................................................................... 5 S7200 的工作方式 ................................................................................. 6 S7200 CPU 22X 的輸入 /輸出接口 ........................................................... 8 S7200 CPU 的擴(kuò)展模塊 ........................................................................... 9 S7200 PLC的尋址方式 及內(nèi)部數(shù)據(jù)存儲區(qū) ................................................... 12 數(shù)據(jù)長度 ............................................................................................... 12 常數(shù) .................................................................................................... 13 尋址方式 ............................................................................................... 13 2 PLC編程軟件 Step 7/Win32及上位機(jī)軟件 MCGS .......................................................... 14 STEP7 M i c r o /W I N V 4 . 0 介 紹 ................................................... 14 基本功能 ............................................................................................... 14 其他功能 ............................................................................................... 14 組態(tài)軟件 MCGS介紹 .......................................................................................... 16 網(wǎng)絡(luò)版 ................................................................................... 17 通用版 ................................................................................... 17 3 火電廠輸煤控制系統(tǒng)的基本構(gòu)成與工藝 ....................................................................... 19 輸煤系統(tǒng)概況 ................................................................................................... 19 輸煤系統(tǒng)定義 ........................................................................................ 19 現(xiàn)代的輸煤系統(tǒng)已不僅僅是煤的輸送問題，而是在煤的輸送過程中必須達(dá)到如下各方面的要求： ................................................................................................................. 19 輸煤系統(tǒng)主要環(huán)節(jié)及主要設(shè) 備 ................................................................ 19 火電廠輸煤控制系統(tǒng)工藝 ................................................................................. 20 火力發(fā)電廠輸煤 PLC控制系統(tǒng)結(jié)構(gòu) ......................................................... 20 火力發(fā)電廠輸煤 PLC控制系統(tǒng)的功能及操作方式 .................................... 21 4 S7200 PLC火電廠輸煤系統(tǒng) ....................................................................................... 23 輸煤系統(tǒng)控制要求 ............................................................................................ 23 PLC 控制系統(tǒng)設(shè)計 ............................................................................................ 24 PLC 選型 ................................................................................................ 24 系統(tǒng)關(guān)系 ............................................................................................... 24 PLC 程序設(shè)計 ......................................................................................... 24 5 上位機(jī)組態(tài) MCGS編程 ................................................................................................. 28 用戶窗口 .......................................................................................................... 28 卸煤窗口 ............................................................................................... 28 工藝流程圖 ............................................................................................ 28 輸煤系統(tǒng) ............................................................................................... 29 設(shè)備組態(tài) .......................................................................................................... 30 實時數(shù)據(jù)庫 ....................................................................................