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PLC是以微處理器為基礎，綜合了計算機技術、自動控制技術和通信技術，用面向控制過程面向用戶的“自然語言”編程，適應工業(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)字運算操作電子系統(tǒng)，專為在工業(yè)環(huán)境下應用而設計。它采用了可編程序的存儲器，用來在其內部存儲執(zhí)行邏輯運算、順序控制、定時、計數(shù)和算術運算等操作指令，并通過數(shù)字的、模擬的輸入和輸出，控制各種類型的機械或生產(chǎn)過程?？删幊绦蚩刂破骷捌溆嘘P的外圍設備，都應按易于與工業(yè)控制系統(tǒng)形成一個整體、易于擴充其功能的原則設計。

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)其結構形式的不同、功能的差異和I/O點數(shù)的多少等進行大致分類。

按結構形式分類

根據(jù)PLC的結構形式，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箱內，如圖所示。具有結構緊湊、體積小、價格低的特點。小型PLC一般采用這種整體式結構。整體式PLC由不同I/O點數(shù)的基本單元（又稱主機）和擴展單元組成，基本單元內有CPU、I/O接口、與I/O擴展單元相連的擴展口以及與編程器或EPROM寫入器相連的接口等；擴展單元內只有I/O和電源等，而沒有CPU。基本單元和擴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，便于擴展和維修。大、中型PLC一般采用模塊式結構。

還有一些PLC將整體式和模塊式的特點結合起來，構成所謂的疊裝式PLC。疊裝式PLC的CPU、電源、I/O接口等也是各自獨立的模塊，但它們之間是靠電纜進行連接的，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、。

RESISTOR METAL FILM, 68OHM, 5%, AXIAL Part # PANASONIC ERG5SJ680
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
RESISTOR METAL FILM, 390 OHM, 5%, AXIAL Part # PANASONIC ERG5SJ391
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
RESISTOR METAL FILM, 22OHM, 5%, AXIAL Part # PANASONIC ERG5SJ220
RESISTOR METAL FILM, 220 OHM, 5%, AXIAL Part # PANASONIC ERG5SJ221
RESISTOR METAL FILM, 2.7KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ272
RESISTOR METAL FILM, 2.2KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ222
RESISTOR METAL FILM, 1OHM, 5%, AXIAL Part # PANASONIC ERX5SJ1R0
RESISTOR METAL FILM, 1KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ102
RESISTOR METAL FILM, 18KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ183
RESISTOR METAL FILM, 180 OHM, 5%, AXIAL Part # PANASONIC ERG5SJ181
RESISTOR METAL FILM, 15KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ153
RESISTOR METAL FILM, 150 OHM, 5%, AXIAL Part # PANASONIC ERG5SJ151
RESISTOR METAL FILM, 12OHM, 5%, AXIAL Part # PANASONIC ERG5SJ120
RESISTOR METAL FILM, 12KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ123
RESISTOR METAL FILM, 10KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ103
RESISTOR METAL FILM, 100KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ104
RESISTOR METAL FILM, 100 OHM, 5%, AXIAL Part # PANASONIC ERG5SJ101
RESISTOR METAL FILM, 1.8OHM, 5%, AXIAL Part # PANASONIC ERX5SJ1R8
RESISTOR METAL FILM, 1.8OHM, 5%, AXIAL Part # PANASONIC ERX3SJ1R8
RESISTOR METAL FILM, 1.8KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ182
RESISTOR METAL FILM, 1.5KOHM, 5%, AXIAL Part # PANASONIC ERG5SJ152
RESISTOR METAL FILM, 0.56 OHM, 5%, AXIAL Part # PANASONIC ERX5SJR56
RESISTOR METAL FILM, 0.39 OHM, 5%, AXIAL Part # PANASONIC ERX5SJR39
RESISTOR METAL FILM, 0.33 OHM, 5%, AXIAL Part # PANASONIC ERX5SJR33
Replacement White Handset Cord 25 Ft. for Panasonic KX-T, KX-DT, KX-NT Phones
Replacement Black Handset Cord 25 Ft. for Panasonic KX-T, KX-DT, KX-NT Phones
QTY 4 - Panasonic ELF-18D428 33HH H Series Line Filter  
QTY (5) ECQU2A224MV PANASONIC .22uf 250V SUPPRESSION POLY FILM CLASS X2 ROHS
QTY (25) 3.3uf 80V 105c SMD ELECTROLYTIC EEV-FK1K3R3R Panasonic
QTY (10) - ZNR 10K201U Varistors
Printrelais 5 V/DC 1 A 2 Wechsler Panasonic TQ25 1 St.
Printrelais 24 V/DC 1 A 2 Wechsler Panasonic AGQ20024 1 St.
Printrelais 12 V/DC 1 A 2 Wechsler Panasonic AGQ20012 1 St.
Printrelais 12 V/DC 1 A 2 Wechsler Panasonic AGN20012 1 St.
PRINTER USB DATA CABLE FOR OKI Olivetti Panasonic Ricoh Samsung
PARTIAL REEL 3000+pcs PANASONIC ERJ2GEJ331X 330R 5% CHIP RESISTOR
PANASONIC,EEUED2W150,CAPACITOR, 15UF, 450V
PANASONIC,EEFCD0J100R,CAPACITOR, CASE D, 10UF, 6.3V
PANASONIC,ECWH8333HA,CAPACITOR, 800V, 33NF, 3%
PANASONIC,ECWF2684JAQ,CAPACITOR, 250V, 680NF, 5%
PANASONIC,ECWF2394JAQ,CAPACITOR, 250V, 390NF, 5%
PANASONIC,ECQV1563JM,CAPACITOR, FILM, 100V, 56NF
PANASONIC,ECA1VAM471X,CAPACITOR, 470UF, 35V
PANASONIC,ECA1HM470,CAPACITOR, 47UF, 50V
PANASONIC,ECA1CAM222X,CAPACITOR, 2200UF, 16V
PANASONIC, EZADT62AAAJ, RC NETWORK, SMD 1206, 1000R, 47PF
PANASONIC, EZADT61AAAJ, RC NETWORK, SMD 1206, 1000R, 22PF
PANASONIC, EZADT12AAAJ, RC NETWORK, SMD 1206, 22R, 47PF
PANASONIC, ETQP5MR68YGC, CHOKE, POWER, 15.0UH, +/-20%,
PANASONIC, ERZV20D112, VARISTOR, 20MM DISC, 1100V
PANASONIC, ERZV14D511, VARISTOR, 14MM DISC, 510V
PANASONIC, ELT3KN149C, COIL, V STEP-UP, 0.33MH, +/-10
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%
PANASONIC, ELL6SH8R2M, CHOKE COIL, POWER, 8.2UH, 1.4A
PANASONIC, ELL6RH2R7M, INDUCTOR, 2.7UH