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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(kāi)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(guò)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(guò)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(kāi)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(lái)輸入、檢查、修改、調(diào)試程序或監(jiān)示PLC的工作情況。通過(guò)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。
6、外部設(shè)備接口
此接口可將打印機(jī)、條碼掃描儀,變頻器等外部設(shè)備與主機(jī)相聯(lián)，以完成相應(yīng)的操作。
實(shí)驗(yàn)裝置提供的主機(jī)型號(hào)有西門子S7-200系列的CPU224(AC/DC/RELAY)。輸入點(diǎn)數(shù)為14，輸出點(diǎn)數(shù)為10；CPU226(AC/DC/RELAY)，輸入點(diǎn)數(shù)為26，輸出點(diǎn)數(shù)為14。

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