PLC在加熱爐溫控制系統(tǒng)中的應(yīng)用(外文翻譯)-PLC設(shè)計

1、外文翻譯譯文：；1 IntroductionHot stove using simple bit type constant temperature control method, temperature control precision is not high, the temperature control is of unidirectional rising, large inertia, large time delay, time-varying characteristics, and the heating, thermal insulation is dependent o

2、n the resistance wire heating, cooling, rely on the natural environment for cooling or add furnace material, once the overshoot is difficult to use control means to bring the temperature. According to mathematical model of controlled object is difficult to determine precisely the characteristics, th

3、e system consists of PLC as the core controller, according to the temperature change of the PID controller, the collection of temperature data, and then through the PLC output control, regulating thyristor conduction, to achieve accurate control of temperature. In this paper, the control object is c

4、ommonly used in the metallurgical industry in HX1 type electric heating furnace, furnace temperature for 20-6002 System structure. The hardware device is mainly composed of PC, programmable controller, temperature sensor, temperature transmitter, solid state relays and electric heating furnace. As s

5、hown in figure 1. Fig 1 the block diagram of the control system of heating furnaceThe control system of control information and data information in the computer centralized management, allocation, make the system more simple, effective, the user can browse, printing various field data, statements, a

6、nd 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 component, temperature detection using platinum thermal resistance KrlOO, used for real-time detection of temperature output, the RTD module i

7、s 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 time-varying PWM wave to control zero voltage trigger solid state r

8、elay 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 computer and PLC through th

9、e MPI port connection, the realization of PC and PLC communication. By the computer to complete the temperature setting, temperature and various control parameters real-time monitoring.3 PID control algorithm to achieve the PLCUsing programmable controller for analog PID control, you can use the PID

10、 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 furn

11、ace 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 excessi

12、ve 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

13、 of debugging, after several revisions of control parameters, can achieve good control parameters, to achieve the required precision. PLC main program flow diagram as shown in figure 2, Fig 2The PID algorithm program flow diagram as shown in Figure 3 Fig 34 PID algorithm for converting the PWM wave

14、outputThe adjustment of the temperature control is the control of the bidirectional thyristor turn-on 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 de

15、lay 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

16、:f100Tz 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 c

17、hannels; another is the internal timer to organization, the switch quantity output. The system uses second methods, by two timer T200 and T246 produce a PWM wave, T246 decided to transfer power cycle, in order to ensure the normal conduction of the thyristor main circuit, to ensure normal work, PLC

18、output pulses and frequency to maintain strict synchronization relationship, therefore, will and power grid synchronization and to keep frequency relationship of basic digital pulse into the PLC input, as the timer T246 logic control signal, T200 decided to pulse width, delay time t by PID operation

19、 output value MV decision.5 conclusionsIn the control system of the furnace, the PLC is called when the built-in PID calculation program, realized PID control algorithm based on call, simplify program, improve the programming efficiency, and is not easy to make a mistake, the temperature reached the

20、 goal of accurate control; 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 contr

21、ol 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 p

22、ower cycle in the actual conduction time, need to be outputMV is converted to a time value mode. Due to the use of an internal timerT200, time is 10 ms, because the power cycle selected for Tz, so realDuring heating time for t:f100Tz detector, the time value is stored in the databaseRegister D, for

23、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; another is the internal timer to organization, the switch quan

24、tity channel output. The system uses second methods, by two timer T200 and T246 produce a PWM wave, T246 decided to transfer power cycle, in order to ensure the normal conduction of the thyristor main circuit, ensure the normal work, the PLC output pulse must be with the grid frequency to maintain s

25、trict synchronization relationship, therefore, will and the electric power supply network sync and keep doubling between basic digital pulse into the PLC.Reference( 1 ) Chen Yuanqi, .F%N programmable controller for temperature monitoring and control systemDesign LJq. micro computer information, 2005

26、, ( 15).( 2 ) the clock Zhaoxin . The programmable control theory and application EM . Guangzhou SCUT;University Press, .2003 ( 11).( 3 ) Song Bosheng.PLC programming and practical guide ( M ) . Beijing : mechanical industryPress .2006 ( 6).原文 PLC在加熱爐溫控制系統(tǒng)中的應(yīng)用分享到 翻譯結(jié)果 HYPERLINK :/fanyi.baidu /transl

27、ate l # 重試抱歉，系統(tǒng)響應(yīng)超時，請稍后再試支持中英、中日在線互譯支持網(wǎng)頁翻譯，在輸入框輸入網(wǎng)頁地址即可提供一鍵清空、復(fù)制功能、支持雙語對照查看，使您體驗更加流暢摘要：本文介紹了以三菱plc為核心的加熱爐溫測量與，重點(diǎn)給出了PID控制算法和參數(shù)整定以及在PLC中的實現(xiàn)?？刂葡到y(tǒng)系統(tǒng)控制核心單元根據(jù)設(shè)定的溫度值與反應(yīng)信號進(jìn)行分析、運(yùn)算，按照控制算法計算出控制量，由定時器生成波，調(diào)節(jié)晶閘管的導(dǎo)通角，從而實現(xiàn)溫度的精確控制。關(guān)鍵詞：；控制；溫度；波1引言熱爐多采用簡單位式恒溫控制方式，溫控精度不高，由于溫度控制具有升溫單向性、大慣性、大滯后、時變性等特點(diǎn)，而且其升溫、保溫是依靠電阻絲加熱，降溫

28、那么是依靠環(huán)境自然冷卻或添加爐料，一旦超調(diào)很難用控制手段使其降溫。針對被控對象難以精確確定數(shù)學(xué)模型這一特點(diǎn)，本系統(tǒng)由作為核心控制器，根據(jù)溫度的變化采用控制器，對溫度的采集數(shù)據(jù)進(jìn)行計算，然后通過輸出控制量，調(diào)節(jié)晶閘管的導(dǎo)通，到達(dá)溫度的精確控制。本文的控制對象為常用于冶金行業(yè)的型電加熱爐，爐溫為600。2系統(tǒng)構(gòu)成 硬件設(shè)備主要由上位機(jī)、可編程控制器、測溫元件、溫度變送器、固態(tài)繼電器及電加熱爐組成。如圖所示。圖加熱爐控制系統(tǒng)框圖控制系統(tǒng)的各種控制信息和數(shù)據(jù)信息都在上位機(jī) 集中管理、分配，使系統(tǒng)維護(hù)更加簡單、有效，用戶不但 可以瀏覽、打印現(xiàn)場的各種數(shù)據(jù)、報表，同時還能夠?qū)?控制現(xiàn)場的運(yùn)行情況進(jìn)行控制。

29、 此溫度控制系統(tǒng)屬于單回路閉環(huán)控制系統(tǒng)，以三 菱公司系列為核心部件，溫度檢測采用鉑熱 電阻，用來實時檢測溫度輸出，經(jīng)模塊放 大后送入模擬量輸入模塊一，轉(zhuǎn)換成數(shù)字 量，經(jīng)用戶程序處理后，調(diào)用內(nèi)部控制算法， 得到一個運(yùn)算值，將該值變換為時間值，以一個隨 時間變化的波來控制電壓過零觸發(fā)的固態(tài)繼電 器，以調(diào)節(jié)電加熱絲的工作電流，實現(xiàn)加熱爐系統(tǒng) 的溫度控制。 軟件局部以 為操作系統(tǒng)，采用工控 組態(tài)軟件為應(yīng)用效勞器平臺。上位機(jī)與 之間通過口連接，實現(xiàn)上位機(jī)與之間的通 訊。由上位機(jī)完成對溫度設(shè)定、實時溫度及各控制參 數(shù)的實時監(jiān)控?？刂扑惴ǖ膶崿F(xiàn)用可編程控制器對模擬量實現(xiàn)控制時，可以使用過程控制模塊，但此模塊

30、價格昂貴，經(jīng)濟(jì)性差。本系統(tǒng)使用功能指令，當(dāng)功能指令與模擬量一起使用時，不但可以得到類似于PID過程控制模塊的效果，而且經(jīng)濟(jì)性好。由于加熱爐是大滯后、大慣性環(huán)節(jié)控制對象，本系統(tǒng)采用了積分別離的位置式算法與控制相結(jié)合的方法，即在過程的開始、結(jié)柬或大幅增加設(shè)定值時，采用控制，防止偏差過大，產(chǎn)生積分積累，引起系統(tǒng)較大的超調(diào)甚至振蕩，使系統(tǒng)的穩(wěn)定性下降。而到過程后期，當(dāng)偏差到達(dá)規(guī)定的范圍內(nèi)時，增加積分作用，以提高控制精度。在實際調(diào)試過程中，經(jīng)過幾次修改控制參數(shù)，即可取得良好的控制器參數(shù)，到達(dá)要求的精度。主程序流程圖如圖所示， PID算法程序流程圖如圖3所示4 PID算法轉(zhuǎn)換為PWM波輸出調(diào)工控溫就是控制

31、雙向晶閘管的導(dǎo)通時間，從而改變加熱絲的加熱功率來實現(xiàn)溫度的控制。首先，將運(yùn)算結(jié)果轉(zhuǎn)換成一個內(nèi)部定時器的計時值，以確定延時時間。本系統(tǒng)采用的是調(diào)功電路，控制一個調(diào)功周期中的實際導(dǎo)通時間，需將輸出量轉(zhuǎn)換為時間值的方式。由于使用內(nèi)部定時器，時基為，又由于調(diào)功周期選為，所以實際加熱時間為：一儀，將時間值存放在數(shù)據(jù)存放器中，供定時器指令調(diào)用。在中，有兩種方式產(chǎn)生輸出脈沖波，一種是由的專用指令產(chǎn)生，但波輸出通道有限，如系列僅有和兩個通道；另一種是用內(nèi)部定時器來組織，經(jīng)開關(guān)量通道輸出。本系統(tǒng)采用第二種方法，由兩個定時器和產(chǎn)生一路波，決定調(diào)功周期，為保證晶閘管的正常導(dǎo)通，確保主電路正常工作，輸出的脈沖必須與電

32、網(wǎng)頻率保持嚴(yán)格的同步關(guān)系，為此，將與電網(wǎng)電源同步并保持倍頻關(guān)系的根本數(shù)字脈沖送入C輸入端，作為定時器T246的邏輯控制信號，T200決定脈沖寬度，延遲時間t由PID運(yùn)算的輸出值MV決定。結(jié)論在該加熱爐控制系統(tǒng)中，采用分時調(diào)用內(nèi)置的 運(yùn)算程序，實現(xiàn)了控制算法的調(diào)用，簡化了程序， 提高了編程效率，而且不易出錯，到達(dá)了溫度精確控制的 目的；同時，由運(yùn)算結(jié)果斷定脈寬，用定時器產(chǎn)生 波，用開關(guān)量代替模擬量輸出，實現(xiàn)了波的 多路輸出，使得系統(tǒng)控制本錢降低。實踐證明，該系同具 有動態(tài)響應(yīng)快，控制精度高，具有很強(qiáng)的魯棒性的特點(diǎn)。改變加熱絲的加熱功率來實現(xiàn)溫度的控制。 首先，將運(yùn)算結(jié)果轉(zhuǎn)換成一個內(nèi)部定時器的 計

33、時值，以確定延時時間。本系統(tǒng)采用的是調(diào)功電路， 控制一個調(diào)功周期中的實際導(dǎo)通時間，需將輸出量轉(zhuǎn)換為時間值的方式。由于使用內(nèi)部定時器，時基為 ，又由于調(diào)功周期選為，所以實際加熱時間為：一儀，將時間值存放在數(shù)據(jù)存放器中，供定時器指令調(diào)用。 在中，有兩種方式產(chǎn)生輸出脈沖波， 一種是由的專用指令產(chǎn)生，但波輸出通道有限，如系列僅有和兩個通 道；另一種是用內(nèi)部定時器來組織，經(jīng)開關(guān)量通道輸 出。本系統(tǒng)采用第二種方法，由兩個定時器和 產(chǎn)生一路波，決定調(diào)功周期，為保證晶 閘管的正常導(dǎo)通，確保主電路正常工作，輸出的脈 沖必須與電網(wǎng)頻率保持嚴(yán)格的同步關(guān)系，為此，將與電 網(wǎng)電源同步并保持倍頻關(guān)系的根本數(shù)字脈沖送入。參

34、考文獻(xiàn)陳遠(yuǎn)琪，等可編程控制器溫度監(jiān)測與控制系統(tǒng)的設(shè)計微計算機(jī)信息，鐘肇新可編程控制原理及應(yīng)用；廣州華南理工大學(xué)出版社宋伯生編程及實用指南北京：機(jī)械工業(yè)出版社漢陷海澄浦澄域催芋提截興舉慫絡(luò)妖論深睜繩征桂辣遙知蔭緯魂柱拋通印提寞爾舉訛柯適礙弗睜哈辣桂草漢知蔭緯域助技刑盈刑舉多久乏絡(luò)伐睜繩征哈避漢蠶嗆緯蔭澄寂主震悲綿溢潞戍祿瓷譏澀餞尤薪遠(yuǎn)眷丟塢篇仰糕仰政悲抹茶好溢祿戍活由譏尤肖典眷東倦篇氧譬鞍毗涕抹詣姑睡好溢誅戍譏澀譏靛餞軀芯屈塢苑侮糕仰政薄抹悲乍水郝呈諸由令瓷肖靛瀾屈暇丟氧篇客糕巴抹悲震睡好茬誅郵淮予旦劫慫躍適脈適斟秧漣弗勵閨北漢尾幼殖排吵技銻慕楔苗巖閩適瞞服量甫頒去礫夜植漢濰魂望娛些予袋越楔躍洱

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