【正文】 University Press, .2003 ( 11).( 3 ) Song programming and practical guide ( M ) . Beijing : mechanical industry Press .2006 ( 6).譯文PLC在加熱爐溫控制系統(tǒng)中的應(yīng)用摘。 at the same time, by the PID operation result decided width, with the timer generated PWM wave, switch quantity instead of analog output, realize the PWM wave output, allows the system to control cost. Proved by practice, this system has a fast dynamic response, high control precision, strong robustness characteristics.Change the heating wire heating power to realize the temperature control. First of all, the PID operation result is converted into an internal timer timing value, to determine the delay time. This system adopts the power regulating circuit, control a power cycle in the actual conduction time, need to be outputRegister D, for timer instruction calls. In PLC, there are two ways to generate PwM output pulse wave, one is by the PLC PWM special instruction generated, but PWM wave output channels is limited, such as the FXzN series PLC only Y0 and Y1 two channels。2 System structure The control system of control information and data information in the puter centralized management, allocation, make the system more simple, effective, the user can browse, printing various field data, statements, and also to control the spot operation control. The temperature control system of single loop control system, by the Mitsubishi Co Fx2N series PLC as the core ponent, temperature detection using platinum thermal resistance KrlOO, used for realtime detection of temperature output, the RTD module is placed after the big into analog input module Fx2N 4AD, converted into digital quantity, the user procedure, call the PLC internal PID the control algorithm, a PID operational values, the values are converted into time value, to a timevarying PWM wave to control zero voltage trigger solid state relay SSR, to regulate the electric heating wire working current, to realize the heating furnace temperature control system. The software part Windows XP as the operating system, the industrial control configuration software MCGS as the application server platform. Between puter and PLC through the MPI port connection, the realization of PC and PLC munication. By the puter to plete the temperature setting, temperature and various control parameters realtime monitoring.3 PID control algorithm to achieve the PLC Using programmable controller for analog PID control, you can use the PID process control module, and this module is expensive, economy is poor. The system uses the PID function instruction, when P1D function instruction with the analog quantity when used together, not only can be similar to the PID process control module, and the economy is good. Due to the heating furnace is large delay, large inertia link control object, the system adopts the integral separation PID algorithm and Bang position Bang control methods, namely at the beginning of the process, the Cambodian guitar or substantially increase the set value, by using the Bang Bang control, prevent excessive deviation, integral accumulation, the system caused by larger overshoot even oscillation, so that the system stability decline. And to the process of the late, when the deviation to the specified range, increase the integral action, in order to improve the control precision. In the actual process of debugging, after several revisions of control parameters, can achieve good control parameters, to achieve the required precision.4 PID algorithm for converting the PWM wave output The adjustment of the temperature control is the control of the bidirectional thyristor turnon time, thereby changing the heating wire heating power to realize the temperature control. First of all, the PID operation result is converted into an internal timer timing value, to determine the delay time. This system adopts the power regulating circuit, control a power cycle in the actual conduction time, the output MV is converted to a time value mode. Due to the use of an internal timer time base for 10ms, T200, and because the power cycle selected for Tz, so the actual heating time for t:fⅢ100Tz detector, the time value is stored in the data register D, for timer instruction calls. In PLC, there are two ways to generate PwM output pulse wave, one is by the PLC PWM special instruction generated, but PWM wave output channels is limited, such as the FXzN series PLC only Y0 and Y1 two channels。 heating furnace。附 錄程序清單參考文獻(xiàn)[1] 林春燕. PLC在電熱鍋爐控制系統(tǒng)實驗裝置中的應(yīng)用[J].工業(yè)控制與應(yīng)用，2009，2(5).23[2] 黃鴻年．PLC在鍋爐控制系統(tǒng)中的穩(wěn)定性分析[J]．，4：2122[3] 高溥. 孟建軍．電器控制基礎(chǔ)與可編程控制器應(yīng)用教程IM]．西安：西安電子科技大學(xué)出版社，2007：247248．201211[4] 廖常初．可編程控制器應(yīng)用技術(shù)[M]．．123124[5] 王芹．可編程控制器技術(shù)及應(yīng)用[M]．．0608[6] 高志宏. 過程控制與自動化儀表[M]. . 1214[7] 厲玉鳴. 化工儀表及自動化[M]. [8] 王森. 儀表工試題集[M]. .0103[9] 邵彬. 基于PLC和觸摸屏的電熱鍋爐控制系統(tǒng)改造[J]工業(yè)控制計算機(jī)2010,23(5).4548[10] 趙陽. 西門子S7300 PLC及工控組態(tài)軟件WinCC的應(yīng)用[M].[11] 王孝武. 現(xiàn)在控制理論. [12] 劉鍇. 周海 深入淺出S7300PILC[M].[13] 廖常初. S7300/400PLC應(yīng)用技術(shù)[M].[14]田峰. 韓紹軍．PLC在堆垛機(jī)控制系統(tǒng)中的應(yīng)用[U]．國內(nèi)外機(jī)電一體化技術(shù)，2001，(2)：5052．[15][I]尤曉玲,陳宏希，張治軍，段曉燕．PLC在堆垛機(jī)控制系統(tǒng)中的應(yīng)用[I]．蘭州石化職業(yè)技術(shù)學(xué)院學(xué)報，2010,10(1)：3032．[16] 董青青. 程紅 基于PLC的爐溫開關(guān)控制系統(tǒng)研究[J]科海故事博覽系統(tǒng)中的PID參數(shù)在線優(yōu)化功能僅限于固定設(shè)定值PID調(diào)節(jié)回路，雖然已能滿足系統(tǒng)的要求，但在系統(tǒng)狀態(tài)有較大改變時，還需要再次對相關(guān)PID控制器實行在線優(yōu)化。當(dāng)然，本控制系統(tǒng)還有很多不足的地方。杰控軟件操作方便，有利于我們比較直觀的觀看控制曲線和溫度的變化。如圖57. 圖57 歷史報警窗口第六章 總結(jié)與展望經(jīng)過幾個月的設(shè)計與實施，本文成功的運(yùn)用了西門子S7300PLC 和組態(tài)王設(shè)計了一個人機(jī)監(jiān)控的溫度控制系統(tǒng)。顯示控制系統(tǒng)的歷史曲線圖，和出口水的溫度并有返回鍵返回主畫面。而I/O 變量是兩者之間互相交換數(shù)據(jù)的橋梁，S7300 和組態(tài)王的數(shù)據(jù)交換是雙向的?；绢愋偷淖兞靠梢苑譃椤皟?nèi)存變量”和I/O 變量兩類。如圖54。如圖53 圖53 系統(tǒng)的人機(jī)界面 建立通訊設(shè)備對PLC和杰控軟件進(jìn)行通訊，實時監(jiān)控和顯示。 圖52圖形庫 鍋爐控制系統(tǒng)的人機(jī)界面在溫度控制系統(tǒng)的人機(jī)界面中，左邊的圖是鍋爐溫度控制系統(tǒng)的靜態(tài)模型圖；右上角的棒狀圖，第一個是對盤管出口水溫度的給定，第二，第三，第四是顯示鍋爐內(nèi)膽，盤管出口水溫度T2，T3的溫度；而中間的棒狀圖就是主調(diào)節(jié)器的的PID的值，對他們進(jìn)行調(diào)試?？梢岳霉ぞ呦渲械墓ぞ呔庉嬜约核O(shè)計的圖像，部分圖片也可以從圖庫中選擇。