產(chǎn)品精品  價(jià)格百年一遇MEASUREX 053499-00
隨著可編程控制器的發(fā)展，其編程軟件呈現(xiàn)多樣化和化發(fā)展趨勢(shì)。由于可編程控制器類型較多，各個(gè)不同機(jī)型對(duì)應(yīng)編程軟件也是有一定的差別，特別是各個(gè)生產(chǎn)廠家的可編程控制器之間，它們的編程軟件不能通用，但是同一生產(chǎn)廠家生產(chǎn)的可編程控制器一般都可以使用。這一點(diǎn)請(qǐng)讀者注意的。
二、編程軟件編程語言表達(dá)方式
可編程控制器與一般的計(jì)算機(jī)相類似，在軟件方面有系統(tǒng)軟件和應(yīng)用軟件之分，只是可編程控制器的系統(tǒng)軟件由可編程控制器生產(chǎn)廠家固化在 ROM 中，一般的用戶只能在應(yīng)用軟件上進(jìn)行操作，即通過編程軟件來編制用戶程序。編程軟件是由可編程控制器生產(chǎn)廠家提供的編程語言，至今為止還沒有一種能適合各種可編程控制器的通用的編程語言，但是各個(gè)可編程控制器發(fā)展過程有類似之處，可編程控制器的編程語言即編程工具都大體差不多，一般有如下五種表達(dá)方式。
( 一 ) 梯形圖（ Ladder Diagram ）
梯形圖是一種以圖形符號(hào)及圖形符號(hào)在圖中的相互關(guān)系表示控制關(guān)系的編程語言，它是從繼電器控制電路圖演變過來的。梯形圖將繼電器控制電路圖進(jìn)行簡(jiǎn)化，同時(shí)加進(jìn)了許多功能強(qiáng)大、使用靈活的指令，將微機(jī)的特點(diǎn)結(jié)合進(jìn)去，使編程更加容易，而實(shí)現(xiàn)的功能卻大大超過傳統(tǒng)繼電器控制電路圖，是目前*普通的一種可編程控制器編程語言。
  化整為零、順藤摸瓜、先主后輔、集零為整、安全保護(hù)、全面檢查。
采用化整為零的原則以某一電動(dòng)機(jī)或電器元件（如接觸器或繼電器線圈）為對(duì)象，從電源開始，自上而下，自左而右，逐一分析其接通斷開關(guān)系。MEASUREX 053499-00
2．分析方法與步驟
①分析主電路
無論線路設(shè)計(jì)還是線路分析都是先從主電路入手。主電路的作用是保證機(jī)床拖動(dòng)要求的實(shí)現(xiàn)。從主電路的構(gòu)成可分析出電動(dòng)機(jī)或執(zhí)行電器的類型、工作方式，起動(dòng)、轉(zhuǎn)向、調(diào)速、制動(dòng)等控制要求與保護(hù)要求等內(nèi)容。
②分析控制電路
主電路各控制要求是由控制電路來實(shí)現(xiàn)的，運(yùn)用“化整為零”、“順藤摸瓜”的原則，將控制電路按功能劃分為若干個(gè)局部控制線路，從電源和主令信號(hào)開始，經(jīng)過邏輯判斷，寫出控制流程，以簡(jiǎn)便明了的方式表達(dá)出電路的自動(dòng)工作過程。


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    Foxboro ICT Pressure Sensor 1234-L671-10A-4 0-150 PSIA in 5 Vdc out 0-100 mv 

   Foxboro ICT Pressure Sensor 1234-L889-09A 0-100 PSIA in 5 Vdc 

   Foxboro Pressure Transducer 1124-023-D54-B1 0-30 PSIG in 12-30Vdc Out .5-5.5 Vdc

   Foxboro Pressure Transducer 1124-02G-A54-B1 0-30 PSIG in 12.5-36Vdc Out 4-20 mA 

   Foxboro Pressure Transducer 1124-07A-A54-B1 0-30 PSIG in 12.5-36Vdc Out 4-20 mA 

   Foxboro Pressure Transducer 1124-07G-A54-B1 0-30 PSIG in 12.5-36Vdc Out 4-20 mA

   Foxboro Pressure Transducer 1224-L887 0-30 PSIA in 10 Vdc Out 0-50 mV 

   Foxboro Fuel Flow Rate Indicator AR-204-A-40 (9423)

    Foxboro Fuel Flow Rate Indicator AR-204-A-40 (9406) 

    (sp 30)E Foxboro 921R-A1a/EP297C Wafer Controller PCM 328 Power Relay Supply 

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   Foxboro 14A Flow Integrator NEW 

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    Foxboro 2AX+BB3 Battery Backup C0153SC Back-Up On-Off Switch Power Supply 

   Foxboro 16A-BD Speed Transmitter NEW

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   FOXBORO 920-EA1 RESISTIVITY PROBE; 10 FT 

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