1747-BSN 可編程序控制器是一種以計(jì)算機(jī)（微處理器）為核心的通用工業(yè)控制裝置。早期的可編程序控制器只能進(jìn)行開(kāi)關(guān)量的邏輯控制，稱為可編程序邏輯控制器（Programmable Logic Controller），簡(jiǎn)稱PLC。當(dāng)今可編程序控制器采用微處理器（Microprocessor）作為中央處理單元，其功能也大大增強(qiáng)，不僅具有邏輯控制功能，還具有算術(shù)運(yùn)算、模擬量處理和通信聯(lián)網(wǎng)等功能，所以稱為可編程序控制器（Programmable Controller），簡(jiǎn)稱 PC。由于個(gè)人計(jì)算機(jī)（Personal Computer）也簡(jiǎn)稱 PC，為避免混淆，所以可編程序控制器仍常被稱為PLC。
國(guó)際電工定義：可編程序控制器是一種數(shù)字運(yùn)算操作的電子系統(tǒng)，專為工業(yè)環(huán)境下應(yīng)用而設(shè)計(jì)。它采用可編程序的存儲(chǔ)器，用來(lái)在其內(nèi)部存儲(chǔ)執(zhí)行邏輯運(yùn)算、順序控制、定時(shí)、計(jì)數(shù)和算術(shù)運(yùn)算等操作的指令，并通過(guò)數(shù)字式、模擬式的輸入和輸出，控制各種機(jī)械或生產(chǎn)過(guò)程。
現(xiàn)今，PLC 技術(shù)、數(shù)控技術(shù)、計(jì)算機(jī)輔助設(shè)計(jì)/計(jì)算機(jī)輔助生產(chǎn)（CAD/CAM）和機(jī)器人技術(shù)并列為工業(yè)生產(chǎn)自動(dòng)化的四大支柱。
PLC的控制功能和性能指標(biāo)
1.PLC的控制功能
（1）開(kāi)關(guān)量控制
開(kāi)關(guān)量控制也就是邏輯控制，這是 PLC 最初的應(yīng)用領(lǐng)域。運(yùn)用在單機(jī)控制、多機(jī)群控和自動(dòng)生產(chǎn)線控制方面，如機(jī)床電氣控制，起重機(jī)、皮帶運(yùn)輸機(jī)、包裝機(jī)械的控制，注塑機(jī)的控制及電梯的控制等，如圖7.1所示。
圖7.1 開(kāi)關(guān)量控制
（2）模擬量控制
圖7.2 閉環(huán)過(guò)程控制
（3）運(yùn)動(dòng)控制
也稱位置控制，通過(guò)高速計(jì)數(shù)模塊和位置控制模塊進(jìn)行單軸或多軸控制，實(shí)現(xiàn)直線運(yùn)動(dòng)或圓周運(yùn)動(dòng)。目前廣泛應(yīng)用在金屬切削機(jī)床、電梯、機(jī)器人等各種機(jī)械設(shè)備上，典型的例子如：PLC和計(jì)算機(jī)數(shù)控裝置CNC組合成一體，構(gòu)成先進(jìn)的數(shù)控機(jī)床，如圖 7.3所示。
（4）數(shù)據(jù)處理
現(xiàn)代PLC能夠完成數(shù)學(xué)運(yùn)算（函數(shù)運(yùn)算、矩陣運(yùn)算、邏輯運(yùn)算），數(shù)據(jù)的移位、比較、傳遞，數(shù)值的轉(zhuǎn)換和查表等操作，對(duì)數(shù)據(jù)進(jìn)行采集、分析和處理。比如柔性制造系統(tǒng)、機(jī)器人控制系統(tǒng)、多點(diǎn)同步運(yùn)行控制系統(tǒng)等。
（5）監(jiān)控功能
PLC能監(jiān)視系統(tǒng)各部分運(yùn)行狀態(tài)和進(jìn)程，對(duì)系統(tǒng)出現(xiàn)的異常情況進(jìn)行報(bào)警和記錄，甚至自動(dòng)終止運(yùn)行;也可在線調(diào)整、修改控制程序中的定時(shí)、計(jì)數(shù)等設(shè)定值或強(qiáng)制I/O狀態(tài)，如圖7.4所示。
（6）通信聯(lián)網(wǎng)
指PLC與PLC、PLC與上位計(jì)算機(jī)、PLC與智能儀表和智能執(zhí)行裝置（如變頻器）之間的通信，利用 PLC 和計(jì)算機(jī)的 RS-232 或RS-422 接口、PLC 的專用通信模塊，用雙絞線和同軸電纜或光纜將它們聯(lián)成網(wǎng)絡(luò)，可實(shí)現(xiàn)相互間的信息交換，構(gòu)成“集中管理、分散控制”的多級(jí)分布式控制系統(tǒng)，建立自動(dòng)化網(wǎng)絡(luò)，如圖7.5所示。
2.PLC的常見(jiàn)技術(shù)性能指標(biāo)
（1）輸入/輸出點(diǎn)數(shù)
I/O點(diǎn)數(shù)即輸入、輸出端子的個(gè)數(shù)，點(diǎn)數(shù)越多，控制規(guī)模就越大。
圖7.4 PLC多機(jī)組控制監(jiān)控系統(tǒng)
圖7.5 PLC電力線通信
（2）掃描速度
指PLC執(zhí)行程序的速度，以ms/K步為單位。如20ms/K，表示掃描1K步的用戶程序所需的時(shí)間是20ms。有時(shí)也以執(zhí)行一步指令的時(shí)間計(jì)，以?s /步為單位。
（3）用戶程序存儲(chǔ)器容量
即內(nèi)存容量，指 PLC 存放用戶程序的存儲(chǔ)器容量。該參數(shù)決定了PLC可以容納用戶程序的長(zhǎng)短，以字節(jié)為單位。在PLC中程序指令是按步存放的，一“步”占用一個(gè)地址單元，一個(gè)地址單元一般占用兩個(gè)字節(jié)。一般一個(gè)地址單元也稱為一個(gè)字，一個(gè)字為 16 位二進(jìn)制數(shù)，每8位二進(jìn)制數(shù)為一個(gè)字節(jié)。
（4）指令條數(shù)
它是衡量PLC軟件功能強(qiáng)弱的主要指標(biāo)。指令種類及條數(shù)越多，其編程功能就越強(qiáng)，即處理能力、控制能力越強(qiáng)。
（5）內(nèi)部寄存器
PLC內(nèi)部有許多種寄存器用以存放變量狀態(tài)、中間結(jié)果、數(shù)據(jù)等，如內(nèi)部繼電器寄存器、特殊繼電器寄存器、數(shù)據(jù)寄存器、定時(shí)/計(jì)數(shù)寄存器、系統(tǒng)寄存器等。這些輔助寄存器可以給用戶提供許多特殊功能或簡(jiǎn)化整體系統(tǒng)設(shè)計(jì)。因此，寄存器的配置是衡量 PLC 硬件功能的一個(gè)指標(biāo)。
（6）高功能模塊
PLC除主控模塊外還可以配置各種高功能模塊。主控模塊實(shí)現(xiàn)基本控制功能，高功能模塊實(shí)現(xiàn)某一種特殊控制功能。高功能模塊的多少，是衡量PLC產(chǎn)品水平高低的重要標(biāo)志。常用高功能模塊有：A/D模塊、D/A模塊、高計(jì)數(shù)模塊、速度控制模塊、位置控制模塊、溫度控制模塊、軸定位模塊、通信模塊、語(yǔ)言編輯以及各種物理量轉(zhuǎn)換模塊等。
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