IC600LX605RR，IC600LX605RRIC600LX605RR
PLC的結(jié)構(gòu)及各部分的作用
、主機(jī)
主機(jī)部分包括中央處理器（CPU）、系統(tǒng)程序存儲(chǔ)器和用戶程序及數(shù)據(jù)存儲(chǔ)器。CPU是PLC的核心，它用以運(yùn)行用戶程序、監(jiān)控輸入/輸出接口狀態(tài)、作出邏輯判斷和進(jìn)行數(shù)據(jù)處理，即讀取輸入變量、完成用戶指令規(guī)定的各種操作，將結(jié)果送到輸出端，并響應(yīng)外部設(shè)備（如電腦、打印機(jī)等）的請(qǐng)求以及進(jìn)行各種內(nèi)部判斷等。PLC的內(nèi)部存儲(chǔ)器有兩類，一類是系統(tǒng)程序存儲(chǔ)器，主要存放系統(tǒng)管理和監(jiān)控程序及對(duì)用戶程序作編譯處理的程序，系統(tǒng)程序已由廠家固定，用戶不能更改；另一類是用戶程序及數(shù)據(jù)存儲(chǔ)器，主要存放用戶編制的應(yīng)用程序及各種暫存數(shù)據(jù)和中間結(jié)果。
2、輸入/輸出（I/O）接口
I/O接口是PLC與輸入/輸出設(shè)備連接的部件。輸入接口接受輸入設(shè)備（如按鈕、傳感器、觸點(diǎn)、行程開關(guān)等）的控制信號(hào)。輸出接口是將主機(jī)經(jīng)處理后的結(jié)果通過功放電路去驅(qū)動(dòng)輸出設(shè)備（如接觸器、電磁閥、指示燈等）。I/O接口一般采用光電耦合電路，以減少電磁干擾，從而提高了可靠性。I/O點(diǎn)數(shù)即輸入/輸出端子數(shù)是PLC的一項(xiàng)主要技術(shù)指標(biāo)，通常小型機(jī)有幾十個(gè)點(diǎn)，中型機(jī)有幾百個(gè)點(diǎn)，大型機(jī)將超過千點(diǎn)。
3、電源
圖中電源是指為CPU、存儲(chǔ)器、I/O接口等內(nèi)部電子電路工作所配置的直流開關(guān)穩(wěn)壓電源，通常也為輸入設(shè)備提供直流電源。
4、編程
編程是PLC利用外部設(shè)備，用戶用來輸入、檢查、修改、調(diào)試程序或監(jiān)示PLC的工作情況。通過專用的PC/PPI電纜線將PLC與電腦聯(lián)接，并利用專用的軟件進(jìn)行電腦編程和監(jiān)控。
5、輸入/輸出擴(kuò)展單元
I/O擴(kuò)展接口用于將擴(kuò)充外部輸入/輸出端子數(shù)的擴(kuò)展單元與基本單元（即主機(jī)）連接在一起。
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ALLEN-BRADLEY 1326AB-B410G-21+1326AB-PGB03-21 Servo
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Allen Bradley SMC-3 Soft Start 150-C135NCD 125HP @ 575V 100HP @ 460V * *
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Allen Bradley Servo Motor MPL-B320P-MJ74AA MPLB320PMJ74AA * 2014*
Allen Bradley Panelview Plus 700 2711P-T7C4D8
ALLEN BRADLEY PANELVIEW PLUS 2711P-T7C4D8 2711PT7C4D8 * SEALED 2014*
ALLEN BRADLEY PANELVIEW PLUS 2711P-T12C4D8 2711PT12C4D8 * SEALED 2015*
ALLEN BRADLEY PANELVIEW PLUS 2711P-T10C4D9 2711PT10C4D9 * SEALED 2014*
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ALLEN BRADLEY CONTROLLER 1769-L23E-QB1B 1769L23EQB1B * SEALED 2013*
ALLEN BRADLEY COMPACTLOGIX CONTROLLER 1769-L33ERM 1769L33ERM * SEALED*
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Allen Bradley 8520-CCRT Operator Panel CRT
