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PLC是以微處理器為基礎(chǔ)，綜合了計算機(jī)技術(shù)、自動控制技術(shù)和通信技術(shù)，用面向控制過程面向用戶的“自然語言”編程，適應(yīng)工業(yè)環(huán)境，簡單易懂、操作方便、可靠性高的新一代通用工業(yè)控制裝置。PLC是在繼電器順序控制基礎(chǔ)上發(fā)展起來的以微處理器為核心的通用自動控制裝置。

可編程序控制器是一種數(shù)字運(yùn)算操作電子系統(tǒng)，專為在工業(yè)環(huán)境下應(yīng)用而設(shè)計。它采用了可編程序的存儲器，用來在其內(nèi)部存儲執(zhí)行邏輯運(yùn)算、順序控制、定時、計數(shù)和算術(shù)運(yùn)算等操作指令，并通過數(shù)字的、模擬的輸入和輸出，控制各種類型的機(jī)械或生產(chǎn)過程?？删幊绦蚩刂破骷捌溆嘘P(guān)的外圍設(shè)備，都應(yīng)按易于與工業(yè)控制系統(tǒng)形成一個整體、易于擴(kuò)充其功能的原則設(shè)計。

PLC產(chǎn)品種類繁多，其規(guī)格和性能也各不相同。對于PLC，通常根據(jù)其結(jié)構(gòu)形式的不同、功能的差異和I/O點數(shù)的多少等進(jìn)行大致分類。

按結(jié)構(gòu)形式分類

根據(jù)PLC的結(jié)構(gòu)形式，可將PLC分為整體式和模塊式兩類。

整體式PLC

整體式PLC是將電源、CPU、I/O接口等部件都集中裝在一個機(jī)箱內(nèi)，如圖所示。具有結(jié)構(gòu)緊湊、體積小、價格低的特點。小型PLC一般采用這種整體式結(jié)構(gòu)。整體式PLC由不同I/O點數(shù)的基本單元（又稱主機(jī)）和擴(kuò)展單元組成，基本單元內(nèi)有CPU、I/O接口、與I/O擴(kuò)展單元相連的擴(kuò)展口以及與編程器或EPROM寫入器相連的接口等；擴(kuò)展單元內(nèi)只有I/O和電源等，而沒有CPU?；締卧蛿U(kuò)展單元之間一般用扁平電纜連接。整體式PLC一般還可配備特殊功能單元，如模擬量單元、位置控制單元等，使其功能得以擴(kuò)展。

2）模塊式PLC

模塊式PLC將PLC的各組成部分分別做成若干個單獨(dú)的模塊，如CPU模塊、I/O模塊、電源模塊（有的含在CPU模塊中）以及各種功能模塊。模塊式PLC由框架或基板和各種模塊組成，模塊裝在框架或基板的插座上，如圖所示。這種模塊式PLC的特點是配置靈活，可根據(jù)需要選配不同規(guī)模的系統(tǒng)，而且裝配方便，便于擴(kuò)展和維修。大、中型PLC一般采用模塊式結(jié)構(gòu)。

還有一些PLC將整體式和模塊式的特點結(jié)合起來，構(gòu)成所謂的疊裝式PLC。疊裝式PLC的CPU、電源、I/O接口等也是各自獨(dú)立的模塊，但它們之間是靠電纜進(jìn)行連接的，并且各模塊可以一層層地疊裝。這樣，不但系統(tǒng)可以靈活配置，還可做得體積小巧。

2.2.按功能分類

根據(jù)PLC的功能不同，可將PLC分為低檔、中檔、。

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RESISTOR METAL FILM, 68KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ683
RESISTOR METAL FILM, 680 OHM, 5%, AXIAL Part # PANASONIC ERG5SJ681
RESISTOR METAL FILM, 6.8KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ682
RESISTOR METAL FILM, 56OHM, 5%, AXIAL Part # PANASONIC ERG5SJ560
RESISTOR METAL FILM, 56KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ563
RESISTOR METAL FILM, 560 OHM, 5%, AXIAL Part # PANASONIC ERG5SJ561
RESISTOR METAL FILM, 5.6KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ562
RESISTOR METAL FILM, 47OHM, 5%, AXIAL Part # PANASONIC ERG5SJ470
RESISTOR METAL FILM, 47KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ473
RESISTOR METAL FILM, 470 OHM, 5%, AXIAL Part # PANASONIC ERG5SJ471
RESISTOR METAL FILM, 4.7OHM, 5%, AXIAL Part # PANASONIC ERX5SJ4R7
RESISTOR METAL FILM, 39OHM, 5%, AXIAL Part # PANASONIC ERG5SJ390
RESISTOR METAL FILM, 39KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ393
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RESISTOR METAL FILM, 33OHM, 5%, AXIAL Part # PANASONIC ERG5SJ330
RESISTOR METAL FILM, 33KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ333
RESISTOR METAL FILM, 330 OHM, 5%, AXIAL Part # PANASONIC ERG5SJ331
RESISTOR METAL FILM, 3.9KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ392
RESISTOR METAL FILM, 3.3KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ332
RESISTOR METAL FILM, 27OHM, 5%, AXIAL Part # PANASONIC ERG5SJ270
RESISTOR METAL FILM, 27KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ273
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RESISTOR METAL FILM, 2.7KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ272
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RESISTOR METAL FILM, 18KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ183
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QTY (25) 3.3uf 80V 105c SMD ELECTROLYTIC EEV-FK1K3R3R Panasonic
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Printrelais 5 V/DC 1 A 2 Wechsler Panasonic TQ25 1 St.
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PARTIAL REEL 3000+pcs PANASONIC ERJ2GEJ331X 330R 5% CHIP RESISTOR
PANASONIC,EEUED2W150,CAPACITOR, 15UF, 450V
PANASONIC,EEFCD0J100R,CAPACITOR, CASE D, 10UF, 6.3V
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PANASONIC,ECA1VAM471X,CAPACITOR, 470UF, 35V
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PANASONIC, ELT3KN139C, COIL, V STEP-UP, 0.68MH, +/-10
PANASONIC, ELT3KN136C, COIL, V STEP-UP, 2.0MH, +/-10
PANASONIC, ELT3KN032C, COIL, V STEP-UP, 25MH, +/-40%
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