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PLC是以微處理器為基礎(chǔ)，綜合了計算機技術(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)行邏輯運算、順序控制、定時、計數(shù)和算術(shù)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。可編程序控制器及其有關(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）和擴展單元組成，基本單元內(nèi)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(nèi)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(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、。

（1）低檔PLC

低檔PLC具有邏輯運算、定時、計數(shù)、移位以及自診斷、監(jiān)控等基本功能，還可有少量模擬量輸入/輸出、算術(shù)運算、數(shù)據(jù)傳送和比較及通信等功能，主要用于邏輯控制、順序控制或少量模擬量控制的單機控制系統(tǒng)。

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WAGO-Klemmen 243-208 50Stck.
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WAGO-Klemme 750-501 digitale Ausgangsklemme 2-Kanal 24V DC
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WAGO-I/O-SYSTEM 750-306/000-005
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Wago750-400 2-Kanal Digital Eingangsklemme DC 24Volt / 0,3ms, viele am Lager !
WAGO280-IEC60947-7-2 TERMINAL BLOCKS,GREEN & YELLOW
WAGO-1/0-System 750-343 Profibus
WAGO-1/0-System 750-343 Profibus
WAGO-1/0-System 750-343 Profibus
Wago® Dosen-, Leuchten-, Hebel-, Verbindungsklemme, Verbindungsklemmen
Wago: 280-677 - Terminal Block, Ground, Dual Pole, 20A, 800V
Wago: 280-633 Terminal Block, Dual Pole, 20A, 800V Set of 26
WAGO,TERMINAL BLOCKS,TOP OB 780601,IEC947-7-1
WAGO,IEC947-7-2,TERMINAL BLOCKS,16MM^2
WAGO,890-713,PLUG, WINSTA MINI,SNAP-IN, 3POLE
WAGO,890-712,PLUG, WINSTA MINI,SNAP-IN, 2POLE
WAGO,890-703,SKT, WINSTA MINI, SNAP-IN, 3POLE
WAGO,870-917,TERM BLOCK, EARTH, 2.5MM2, 2 CON
WAGO,870-914,TERM. BLOCK, EX, 2.5MM2, 2 CON
WAGO,870-911,TERMINAL BLOCK, 2.5MM2, 2 CON
WAGO,870-907,TERM BLOCK, EARTH, 2.5MM2, 2 CON
WAGO,870-904,TERM. BLOCK, EX, 2.5MM2, 2 CON
WAGO,870-901,TERMINAL BLOCK, 2.5MM2, 2 CON
WAGO,870-831,TERMINAL BLOCK, 4MM2, 2 CON, GREY
WAGO,870-681,TERMINAL BLOCK, 2.5MM2, 3 CON
WAGO,870-518,END PLATE, DOUBLE DECK, 2MM, GREY
WAGO,870-501,TERM BLK, 2 DECK, 2.5MM2, 2 CON
WAGO,870-402,JUMPER, FOR 870 SERIES, 2WAY
WAGO,862-505.,TERMINAL BLOCK, 5POLE
WAGO,862-503,TERMINAL BLOCK, 3POLE
WAGO,859-794,TERMINAL, BLOCK, OPTOCOUPLED
WAGO,859-525.,END/INTERMEDIATE PLATE
WAGO,859-304,RELAY, DIN, TERMINAL BLOCK
WAGO,790-116.,SCREEN CLAMP, 16MM CONDUCTOR
WAGO,770-676,T-CONNECTOR, WINSTA MIDI, 4P,
WAGO,770-656,T-CONNECTOR, WINSTA MIDI, 3P,
WAGO,770-134,PLUG & HOUSING, WINSTA MIDI, 4P
WAGO,770-133,PLUG & HOUSING, WINSTA MIDI, 3P
WAGO,770-124,SOCKET & HOUSING, WINSTA MIDI
WAGO,770-123,SOCKET & HOUSING, WINSTA MIDI
WAGO,770-115,PLUG & HOUSING, WINSTA MIDI, 5P
WAGO,770-114,PLUG & HOUSING, WINSTA MIDI, 4P
WAGO,770-105,SOCKET & HOUSING, WINSTA MIDI
WAGO,770-104,SOCKET & HOUSING, WINSTA MIDI
WAGO,733-204.,PLUG, STRAIGHT, 4WAY
WAGO,733-203.,PLUG, STRAIGHT, 3WAY
WAGO,733-112,PLUG, RIGHTANGLE, 12WAY
WAGO,733-110.,PLUG, RIGHTANGLE, 10WAY
WAGO,733-104.,PLUG, RIGHTANGLE, 4WAY
WAGO,733-103.,PLUG, RIGHTANGLE, 3WAY
WAGO,51228987,INSTALLER BOX, BASIC
WAGO,284-901,TERMINAL BLOCK, DIN, 57A, GREY
WAGO,284-402,JUMPER, ADJACENT, INSULATED, GREY
WAGO,282-334.,END PLATE
WAGO,282-311,END PLATE, GREY
WAGO,282-122,TERMINAL BLOCK, F, DIN, 20MM
WAGO,282-101,TERMINAL BLOCK, DIN, 41A, GREY
WAGO,281-907,TERMINAL BLOCK, EARTH, DIN, 32A
WAGO,281-901,TERMINAL BLOCK, DIN, 32A, GREY
WAGO,281-681,TERMINAL BLOCK, DIN, 4MM, 3COND
WAGO,281-652,TERMINAL BLOCK, DIN, 4COND, 26A
WAGO,281-611,TERMINAL BLOCK, F, DIN, 5X20MM
WAGO,281-530,TERMINAL BLOCK, MOTOR WIRING
WAGO,281-402,JUMPER, ADJACENT, INSULATED, GREY
WAGO,281-324,ENDPLATE, GREY, 2.5MM WIDE
WAGO,281-311.,END PLATE
WAGO,281-301,END PLATE, GREY, 3MM WIDE
WAGO,281-107,TERMINAL BLOCK, DIN, GRN/YEL
WAGO,281-101,TERMINAL BLOCK, DIN, 32A, GREY
WAGO,280-901,TERMINAL BLOCK, DIN, 24A, GREY
WAGO,280-835/056-000,SPACER, FOR 280-833, ORANGE
WAGO,280-833,TERMINAL BLOCK, DIN, 4COND, 20A
WAGO,280-684,TERMINAL BLOCK, DIN, 2.5MM, 3COND
WAGO,280-681,TERMINAL BLOCK, DIN, 3COND, 24A
WAGO,280-641,TERMINAL BLOCK, DIN, 26A, GREY
WAGO,280-637,TERMINAL BLOCK, DIN, GRN/YEL
WAGO,280-402,JUMPER, ADJACENT, INSULATED, GREY
WAGO,280-333,END & INTERMEDIATE PLATE,FOR 280
WAGO,280-326,ENDPLATE, ORANGE, 2.5MM WIDE
WAGO,280-314,END PLATE, 2.5MM
WAGO,280-313,END PLATE, ORANGE, 2.5MM WIDE
WAGO,280-312,END PLATE, GREY, 2.5MM WIDE
WAGO,280-308,END PLATE, 2.5MM, GREY
WAGO,280-301,END PLATE, GREY, 2.5MM WIDE
WAGO,280-107,TERMINAL BLOCK, EARTH, DIN, GRN
WAGO,279-901,TERMINAL BLOCK, DIN, 18A, GREY
WAGO,279-837,TERMINAL BLOCK, EARTH, DIN, 4COND
WAGO,279-831,TERMINAL BLOCK, DIN, 4COND, 18A
WAGO,279-402,JUMPER, ADJACENT, INSULATED, GREY
WAGO,279-344,END PLATE, 1.5MM
WAGO,279-104,TERMINAL BLOCK, DIN, 18A, BLUE
WAGO,273-255,CONNECTOR, 5POLE, 2.5MM, CLEAR
WAGO,273-155,CONNECTOR, 5POLE, 1.5MM, CLEAR
WAGO,273-101,CONNECTOR, 5POLE, 1.5MM, GREY
WAGO,264-731,TERMINAL BLOCK, DIN, 4COND, 24A
WAGO,264-727,TERMINAL BLOCK, EARTH, DIN, 4COND
WAGO,264-711,TERMINAL BLOCK, DIN, 2COND, 24A
WAGO,264-701,TERMINAL BLOCK, DIN, 2COND, 24A
WAGO,264-402,JUMPER BAR, COMB TYPE, GREY
WAGO,264-368,END PLATE, GREY, 4MM WIDE
WAGO,262-301,TERMINAL BLOCK, DIN, 2COND, 24A
WAGO,261-402,JUMPER BAR, COMB TYPE
WAGO,261361,END PLATE, GREY, PK10
WAGO,261-361,END PLATE, GREY
WAGO,261-337,TERMINAL BLOCK, DIN, 4COND, 18A
WAGO,261-331,TERMINAL BLOCK, DIN, 4COND, 18A
WAGO,261-306,TERMINAL BLOCK, DIN, 2COND, 18A
WAGO,261-301,TERMINAL BLOCK, DIN, 2COND, 18A
WAGO,260-361,END PLATE, GREY
WAGO,260-331,TERMINAL BLOCK, DIN, 4COND, 18A
WAGO,260-304,TERMINAL BLOCK, DIN, 2COND, 18A
WAGO,260-301,TERMINAL BLOCK, DIN, 2COND, GREY
WAGO,256-747,TERMINAL BLOCK, PCB
WAGO,256-746,TERMINAL BLOCK, PCB
WAGO,256-744,TERMINAL BLOCK, PCB
WAGO,256-743,TERMINAL BLOCK, PCB
WAGO,256-401,TERMINAL BLOCK, PCB
WAGO,256-100,END COVER
WAGO,255-746,TERMINAL BLOCK, PCB
WAGO,255-743,TERMINAL BLOCK, PCB
WAGO,255-401,TERMINAL BLOCK, 5MM
WAGO,254-451,TERMINAL BLOCK, PCB, GREY
WAGO,254-100,END COVER
WAGO,250-212.,TERMINAL BLOCK, PCB, 3.5MM, 12WAY
WAGO,250-206.,TERMINAL BLOCK, PCB, 3.5MM, 6WAY
WAGO,250-205.,TERMINAL BLOCK, PCB, 3.5MM, 5WAY
WAGO,250-203.,TERMINAL BLOCK, PCB, 3.5MM, 3WAY
WAGO,249-117,END STOP, FOR TS35