D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40
D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40
D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40
D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40 D15CR40
在PLC中有多種程序設(shè)計(jì)語(yǔ)言,它們是梯形圖語(yǔ)言、布爾助記符語(yǔ)言、功能表圖語(yǔ)言、功能模塊圖語(yǔ)言及結(jié)構(gòu)化語(yǔ)句描述語(yǔ)言等。梯形圖語(yǔ)言和布爾助記符語(yǔ)言是基本程序設(shè)計(jì)語(yǔ)言,它通常由一系列指令組成,用這些指令可以完成大多數(shù)簡(jiǎn)單的控制功能,例如,代替繼電器、計(jì)數(shù)器、計(jì)時(shí)器完成順序控制和邏輯控制等,通過(guò)擴(kuò)展或增強(qiáng)指令集,它們也能執(zhí)行其它的基本操作。功能表圖語(yǔ)言和語(yǔ)句描述語(yǔ)言是高級(jí)的程序設(shè)計(jì)語(yǔ)言,它可根據(jù)需要去執(zhí)行更有效的操作,例如,模擬量的控制,數(shù)據(jù)的操縱,報(bào)表的報(bào)印和其他基本程序設(shè)計(jì)語(yǔ)言無(wú)法完成的功能。功能模塊圖語(yǔ)言采用功能模塊圖的形式,通過(guò)軟連接的方式完成所要求的控制功能,它不僅在PLC中得到了廣泛的應(yīng)用,在<a b="http://www.dqjsw.com.cn/dianqi/%3Ca%20b=" http:="" www.dqjsw.com.cn="" dianqi="" dcs="" '="" target="b" style="text-decoration: none; color: rgb(0, 0, 0);">DCS/' target='b'>集散控制系統(tǒng)的編程和組態(tài)時(shí)也常常被采用,由于它具有連接方便、操作簡(jiǎn)單、易于掌握等特點(diǎn),為廣大工程設(shè)計(jì)和應(yīng)用人員所喜愛(ài)。
根據(jù)PLC應(yīng)用范圍,程序設(shè)計(jì)語(yǔ)言可以組合使用,常用的程序設(shè)計(jì)語(yǔ)言是:梯形圖程序設(shè)計(jì)語(yǔ)言;布爾助記符程序設(shè)計(jì)語(yǔ)言(語(yǔ)句表);功能表圖程序設(shè)計(jì)語(yǔ)言;功能模塊圖程序設(shè)計(jì)語(yǔ)言;結(jié)構(gòu)化語(yǔ)句描述程序設(shè)計(jì)語(yǔ)言;梯形圖與結(jié)構(gòu)化語(yǔ)句描述程序設(shè)計(jì)語(yǔ)言;布爾助記符與功能表圖程序設(shè)計(jì)語(yǔ)言;布爾助記符與結(jié)構(gòu)化語(yǔ)句描述程序設(shè)計(jì)語(yǔ)言。
1、梯形圖(Ladder Diagram)
程序設(shè)計(jì)語(yǔ)言梯形圖程序設(shè)計(jì)語(yǔ)言是用梯形圖的圖形符號(hào)來(lái)描述程序的一種程序設(shè)計(jì)語(yǔ)言。采用梯形圖程序設(shè)計(jì)語(yǔ)言,程序采用梯形圖的形式描述。這種程序設(shè)計(jì)語(yǔ)言采用因果關(guān)系來(lái)描述事件發(fā)生的條件和結(jié)果。每個(gè)梯級(jí)是一個(gè)因果關(guān)系。在梯級(jí)中,描述事件發(fā)生的條件表示在左面,事件發(fā)生的結(jié)果表示在后面。梯形圖程序設(shè)計(jì)語(yǔ)言是最常用的一種程序設(shè)計(jì)語(yǔ)言。它來(lái)源于繼電器邏輯控制系統(tǒng)的描述。
在工業(yè)過(guò)程控制領(lǐng)域,電氣技術(shù)人員對(duì)繼電器邏輯控制技術(shù)較為熟悉,因此,由這種邏輯控制技術(shù)發(fā)展而來(lái)的梯形圖受到了歡迎,并得到了廣泛的應(yīng)用。梯形圖程序設(shè)計(jì)語(yǔ)言的特點(diǎn)是:(1)與電氣操作原理圖相對(duì)應(yīng),具有直觀性和對(duì)應(yīng)性;
?。?)與原有繼電器邏輯控制技術(shù)相一致,對(duì)電氣技術(shù)人員來(lái)說(shuō),易于撐握和學(xué)習(xí);
?。?)與原有的繼電器邏輯控制技術(shù)的不同點(diǎn)是,梯形圖中的能流(Power FLow)不是實(shí)際意義的電流,內(nèi)部的繼電器也不是實(shí)際存在的繼電器,因此,應(yīng)用時(shí),需與原有繼電器邏輯控制技術(shù)的有關(guān)概念區(qū)別對(duì)待; PLC資料網(wǎng)
(4)與布爾助記符程序設(shè)計(jì)語(yǔ)言有一一對(duì)應(yīng)關(guān)系,便于相互的轉(zhuǎn)換和程序的檢查。
2、布爾助記符(Boolean Mnemonic)
程序設(shè)計(jì)語(yǔ)言布爾助記符程序設(shè)計(jì)語(yǔ)言是用布爾助記符來(lái)描述程序的一種程序設(shè)計(jì)語(yǔ)言。布爾助記符程序設(shè)計(jì)語(yǔ)言與計(jì)算機(jī)中的匯編語(yǔ)言非常相似,采用布爾助記符來(lái)表示操作功能。
布爾助記符程序設(shè)計(jì)語(yǔ)言具有下列特點(diǎn):
?。?)采用助記符來(lái)表示操作功能,具有容易記憶,便于撐握的特點(diǎn);
?。?)在編程器的鍵盤(pán)上采用助記符表示,具有便于操作的特點(diǎn),可在無(wú)計(jì)算機(jī)的場(chǎng)合進(jìn)行編程設(shè)計(jì);
?。?)與梯形圖有一一對(duì)應(yīng)關(guān)系。其特點(diǎn)與梯形圖語(yǔ)言基本類(lèi)同。
3、功能表圖(Sepuential Function Chart)
程序設(shè)計(jì)語(yǔ)言功能表圖程序設(shè)計(jì)語(yǔ)言是用功能表圖來(lái)描述程序的一種程序設(shè)計(jì)語(yǔ)言。它是近年來(lái)發(fā)展起來(lái)的一種程序設(shè)計(jì)語(yǔ)言。采用功能表圖的描述,控制系統(tǒng)被分為若干個(gè)子系統(tǒng),從功能入手,使系統(tǒng)的操作具有明確的含義,便于設(shè)計(jì)人員和操作人員設(shè)計(jì)思想的溝通,便于程序的分工設(shè)計(jì)和檢查調(diào)試。
功能表圖程序設(shè)計(jì)語(yǔ)言的特點(diǎn)是:
?。?)以功能為主線,條理清楚,便于對(duì)程序操作的理解和溝通;
?。?)對(duì)大型的程序,可分工設(shè)計(jì),采用較為靈活的程序結(jié)構(gòu),可節(jié)省程序設(shè)計(jì)時(shí)間和調(diào)試時(shí)間;
?。?)常用于系統(tǒng)的規(guī)模校大,程序關(guān)系較復(fù)雜的場(chǎng)合;
(4)只有在活動(dòng)步的命令和操作被執(zhí)行,對(duì)活動(dòng)步后的轉(zhuǎn)換進(jìn)行掃描,因此,整個(gè)程序的掃描時(shí)間較其他程序編制的程序掃描時(shí)間要大大縮短。功能表圖來(lái)源于佩特利(Petri)網(wǎng),由于它具有圖形表達(dá)方式,能較簡(jiǎn)單和清楚地描述并發(fā)系統(tǒng)和復(fù)雜系統(tǒng)的所有現(xiàn)象,并能對(duì)系統(tǒng)中存有的象死鎖、不安全等反常現(xiàn)象進(jìn)行分析和建模,在模型的基礎(chǔ)上能直接編程,所以,得到了文泛的應(yīng)用。近幾年推出的PLC和小型集散控制系統(tǒng)中也已提供了采用功能表圖描述語(yǔ)言進(jìn)行編程的軟件。關(guān)于佩特利(Petri)網(wǎng)的一些基本概念,我在以后有機(jī)會(huì)時(shí)再介紹給各位,以有助于對(duì)功能表圖的進(jìn)一步理解。
5、結(jié)構(gòu)化語(yǔ)句(Structured Text)
描述程序設(shè)計(jì)語(yǔ)言結(jié)構(gòu)化語(yǔ)句描述程序設(shè)計(jì)語(yǔ)言是用結(jié)構(gòu)化的描述語(yǔ)句來(lái)描述程序的一種程序設(shè)計(jì)語(yǔ)言。它是一種類(lèi)似于高級(jí)語(yǔ)言的程序設(shè)計(jì)語(yǔ)言。在大中型的PLC系統(tǒng)中,常采用結(jié)構(gòu)化語(yǔ)句描述程序設(shè)計(jì)語(yǔ)言來(lái)描述控制系統(tǒng)中各個(gè)變量的關(guān)系。它也被用于集散控制系統(tǒng)的編程和組態(tài)。結(jié)構(gòu)化語(yǔ)句描述程序設(shè)計(jì)語(yǔ)言采用計(jì)算機(jī)的描述語(yǔ)句來(lái)描述系統(tǒng)中各種變量之間的各種運(yùn)算關(guān)系,完成所需的功能或操作。大多數(shù)制造廠商采用的語(yǔ)句描述程序設(shè)計(jì)語(yǔ)言與BASIC語(yǔ)言、PASCAL語(yǔ)言或C語(yǔ)言等高級(jí)語(yǔ)言相類(lèi)似,但為了應(yīng)用方便,在語(yǔ)句的表達(dá)方法及語(yǔ)句的種類(lèi)等方面都進(jìn)行了簡(jiǎn)化。
結(jié)構(gòu)化程序設(shè)計(jì)語(yǔ)言具有下列特點(diǎn):
?。?)采用高級(jí)語(yǔ)言進(jìn)行編程,可以完成較復(fù)雜的控制運(yùn)算;
?。?)需要有一定的計(jì)算機(jī)高級(jí)程序設(shè)計(jì)語(yǔ)言的知識(shí)和編程技巧,對(duì)編程人員的技能要求較高,普通電氣人員無(wú)法完成。
(3)直觀性和易操作性等性能較差;
(4)常被用于采用功能模塊等其他語(yǔ)言較難實(shí)現(xiàn)的一些控制功能的實(shí)施。部分PLC的制造廠商為用戶提供了簡(jiǎn)單的結(jié)構(gòu)化程序設(shè)計(jì)語(yǔ)言,它與助記符程序設(shè)計(jì)語(yǔ)言相似,對(duì)程序的步數(shù)有一定的限制,同時(shí),提供了與PLC間的接口或通信連接程序的編制方式,為用戶的應(yīng)用程序提供了擴(kuò)展余地。
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CUTLER HAMMER C10BG3A NSFP C10BG3A
Cutler Hammer DH364NGK 200 Amp, 600 Volt, Fused Disconnect
Cutler Hammer JD325OF Circuit Breaker 250A 3-Pole 600V & JT3225T Trip Unit
Cutler Hammer Nema Size 5 6002H515A Motor Contactor
CUTLER HAMMER HFD HFD3110 * 3 POLE 110 AMP BREAKER SHUNT/ AUXILIARY TRIP
CUTLER HAMMER JD35K CIRCUIT BREAKER
CUTLER HAMMER CHH3200 3P 200 AMP CIRCUIT BREAKER
CUTLER HAMMER CIRCUIT BREAKER 3P 100 AMP 240V CHH3100
CUTLER HAMMER CIRCUIT BREAKER 3P 150 AMP 240V CHH3150
CUTLER HAMMER CHH3060 3P 60 AMP CIRCUIT BREAKER
Eaton Cutler-Hammer Panel PRL1a-E42 PRL2a 225 AMP MAIN Plus 42 20 Amp Breakers
Navy Circuit Breaker AQB-LF250 250 Amp Frame 500 Volt 3P Fused Cutler Hammer ITE
Naval AQB Fuse ENT 7741 Rose Bud
Navy Circuit Breaker AQB-LF250 125 Amp Trip 500 Volt 3P Fused Cutler Hammer ITE
Naval 3-7741 AQB Fuse ENT 7741
Cutler Hammer WH KDB2350 KT2350T ext Lugs 350 A Amp
Cutler-Hammer 5ACLE-150E 150E Amp A Fuse NIB
CUTLER HAMMER HFD HFD3110 3 POLE 110 AMP BREAKER SHUNT/ AUXILIARY TRIP
CUTLER HAMMER HFD3150 150a 3 POLE CIRCUIT BREAKER NIB
Cutler Hammer Westinghouse 2100 100 Amp Size 3 Breaker MCC Bucket 100A MCCB 17"
CUTLER-HAMMER CIRCUIT BREAKER PART # KB3125 NSN: 5925-01-069-7154
CUTLER HAMMER WESTINGHOUSE KDB3400W 400 AMP CIRCUIT BREAKER
CUTLER HAMMER WESTINGHOUSE HMCP400X5 400 AMP CIRCUIT BREAKER
CUTLER HAMMER WESTINGHOUSE HMCP400X5W 400AMP 600VAC 250VDC TRIP UNIT
CUTLER-HAMMER ITAP362 60A 600V 3W FUSIBLE BUSPLUG
CUTLER HAMMER HMCPO15EOC NSFP HMCPO15EOC
CUTLER HAMMER A50-CNOA NSFP A50CNOA
HMCP150T4C Cutler Hammer ------------------------- NEW
CUTLER HAMMER 4105H333H USPP 4105H333H
CUTLER HAMMER A309TN NSFP A309TN
CUTLER HAMMER 15RBA4-NH USPP 15RBA4NH
Cutler-Hammer D100CRA20
Cutler-Hammer D100CRA20A
NEW CUTLER HAMMER HMCP HMCP150T4 150 AMP BREAKER **
CUTLER HAMMER 9441H287C USPP 9441H287C
CUTLER HAMMER FUSED COMBINATION MOTOR STARTER SIZE 2 3R
CUTLER HAMMER REDUCED VOLTAGE STARTER 62ES1-4060P 480/460V 60HP MOTOR drive ac
CUTLER HAMMER MOULDED CIRCUIT BREAKER CAT #HMCP150T4C NEW 150AMP
CUTLER HAMMER HFD HFD3125L 3 POLE 125 AMP BREAKER SHUNT
Cutler Hammer CP2 Busplug w/ EHB3015 15A Breaker
CUTLER HAMMER KT3200T NSFP KT3200T
Cutler Hammer Breakers,CHNT2020, CH120,BR2100,BR220,BR115, CHNT1515, New, Qty 64
Cutler Hammer DS90040A Industrial Computer - Used
CUTLER HAMMER FD-B3125 NSPP FDB3125
CUTLER HAMMER DH362NRK NSFP DH362NRK