【正文】 N Y 主程序系統(tǒng)初始化手動控制自動？調(diào)汽包水位控制子程序調(diào)燃燒過程控制子程序調(diào)系統(tǒng)異常報警程序10圖 5 主程序流程圖 I/O 口分配I/O 口分配情況如表 6 所示。變頻器的最高輸出頻率對于不同的機種有不同的值，最高頻率有 50、60、1200HZ 甚至更高。1%；　蒸汽177。其技術(shù)參數(shù)如表 4 所示。（4）在溫度范圍內(nèi)都具有穩(wěn)定的物理性質(zhì)和化學(xué)性質(zhì)。傳感器是能夠接受規(guī)定的被測量并按照一定的規(guī)律轉(zhuǎn)換成可用輸出信號的器件或裝置的總稱，通常由敏感元件和轉(zhuǎn)換元件組成。因此本系統(tǒng)采用松下電工 FP1C16 的 AFP12216。燃煤鍋爐系統(tǒng)的特點：(1)控制模擬量多、控制回路復(fù)雜。在引風(fēng)機的抽吸作用下經(jīng)過省煤氣和空氣預(yù)熱器，把預(yù)熱傳導(dǎo)給進入鍋爐的水和空氣。對30 萬臺燃煤鍋爐來說一年就能節(jié)約 800 多億元。蒸汽鍋爐主要作用是向各生產(chǎn)裝置或設(shè)備提供所需的合格蒸汽。關(guān)鍵詞：可編程控制器，汽包水位，蒸汽壓力，爐膛負壓1THE DESIGN OF AUTOMATIC CONTROL SYSTEM OF STEAM BOILER BASED ON PLCAbstract：The industrial boiler is an important motive equipments in the production line .The main function of steam boiler supply kinds of equipments need of qualified stream .The good and bad of its control quality influence not only its run result, but also the stability and the credibility of the related equipments directly. This paper describe the structure of the system and the work principle about industrial steam boiler adding to its function of control system .The paper importantly investigate the modularization design of hardware and software based on strong PLC, which is the core of the whole system. It concretely investigate a few dynamic states of the well controlling steam boiler in according to control loop arithmetic. Make well use of the PLC’s many soft and hardware resources, especially PID control to improve the dynamic state quality of the whole control system in order to make whole the system get a very great exaltation in stability and credibility.Key words: PLC, water position of boiler, stream pressure, heart negative pressure2目 錄1 緒論 ................................................................................................................................12 鍋爐的結(jié)構(gòu)及工作原理 ...............................................................................................13 鍋爐控制系統(tǒng)框圖 .......................................................................................................24 控制系統(tǒng)的硬件設(shè)計 ...................................................................................................2 PLC 機型的選擇 ........................................................................................................2 輸入輸出模塊的選擇 ...............................................................................................3 傳感器或變送器的選擇 ...........................................................................................3 溫度變送器的選擇 ...................................................................................................4 壓力傳感器的選擇 ...................................................................................................5 流量變送器的選擇 ...................................................................................................5 水位傳感器的選擇 ...................................................................................................6 變頻器的選擇 ............................................................................................................75 控制系統(tǒng)軟件設(shè)計 .......................................................................................................7 控制系統(tǒng)的軟件流程圖 ...........................................................................................7 I/O 口分配 ..................................................................................................................8 PLC 的電氣接線圖 .........................