6ES7416-2XL01-0AB0西門子6ES7416-2XL01-0AB0西門子
PLC的三種編程語言的特點(diǎn)介紹
1．梯形圖編程語言
梯形圖沿襲了繼電器控制電路的形式，它是在電器控制系統(tǒng)中常用的繼電器、接觸器邏輯控制基礎(chǔ)上簡化了符號演變來的，形象、直觀、實(shí)用。
梯形圖的設(shè)計(jì)應(yīng)注意以下三點(diǎn)：
（一）梯形圖按從左到右、從上到下的順序排列。每一邏輯行起始于左母線，然后是觸點(diǎn)的串、并聯(lián)接，zui后是線圈與右母線相聯(lián)。
（二）梯形圖中每個(gè)梯級流過的不是物理電流，而是“概念電流”，從左流向右，其兩端沒有電源。這個(gè)“概念電流”只是形象地描述用戶程序執(zhí)行中應(yīng)滿足線圈接通的條件。
（三）輸入繼電器用于接收外部輸入信號，而不能由PLC內(nèi)部其它繼電器的觸點(diǎn)來驅(qū)動。因此，梯形圖中只出現(xiàn)輸入繼電器的觸點(diǎn)，而不出現(xiàn)其線圈。輸出繼電器輸出程序執(zhí)行結(jié)果給外部輸出設(shè)備，
當(dāng)梯形圖中的輸出繼電器線圈得電時(shí)，就有信號輸出，但不是直接驅(qū)動輸出設(shè)備，而要通過輸出接口的繼電器、晶體管或晶閘管才能實(shí)現(xiàn)。輸出繼電器的觸點(diǎn)可供內(nèi)部編程使用。
鄭娟萍
廈門仲鑫航自動化設(shè)備有限公司
2．語句表編程語言
指令語句表示一種與計(jì)算機(jī)匯編語言相類似的助記符編程方式，但比匯編語言易懂易學(xué)。一條指令語句是由步序、指令語和作用器件編號三部分組成。
3．控制系統(tǒng)流程圖編程圖
控制系統(tǒng)流程圖是一種較新的編程方法。它是用像控制系統(tǒng)流程圖一樣的功能圖表達(dá)一個(gè)控制過程，目前電工協(xié)會(IEC)正在實(shí)施發(fā)展這種新式的編程標(biāo)準(zhǔn)。Allen Bradley 1771-IK/1771IK Encoder Revision D01
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*SEALED*Allen Bradley 1794-OA16/1794O?A16/1794-0A16/1?794...
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Allen bradley 1785-LT/1785-LT?B/1785LT/1785LT?B
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Allen Bradley 1747-L20C/1747L?20C Ser B Frn 4
Allen Bradley 1771-ODD/1771OD?D Ser B, Revision D01 Outp...
*SEALED* Allen Bradley 1794-IA8I/1794I?A8I Cat Rev E04 O...
Allen Bradley 1772-LSP/1772LS?P Mini Processor
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Allen Bradley 1772-MEB /1772MEB Ram Memory
Allen Bradley 1771-ISC/1771IS?C Multiplexor Input
