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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?；締卧蛿U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、。

WITTENSTEIN GEARBOX ALPHA V-DRV 063 40:1, VDH063-MF1-40-041-OG1MPLB4530K
Wittenstein Alpha VDS 050-MF1-7 -931-0F Servo Worm Gearhead Ratio 7
Wittenstein Alpha TP-050S-MF1-10 Planetary Gear Reducer 10:1 Ratio TP050SMF110
Wittenstein Alpha SPK-075-MF2-5-131-000 Gear Box SPK075MF25131000 1326AB-B430
WITTENSTEIN ALPHA SP-100S-MF2-16-0E1-2S 16:1 PLANETARY GEAR REDUCER B422173
Wittenstein Alpha SP-075S-MF1-7-OE1-2S Multi-Stage Gearhead Ratio i=7
WITTENSTEIN ALPHA SP075S-MC2-16 -1C1-2K-PS1
Wittenstein Alpha SP-075-MF1-2-131-000 Right Angle GearHead SP075MF12131000 
Wittenstein Alpha SP-060S-MF1-10-0C1-2S Gear Reducer 10:1 SP060SMF1100C12S 
WITTENSTEIN ALPHA SP 140S-MC1-5-1K1-2K-PS1
WITTENSTEIN ALPHA SP 140S-MC1-3 -1K1-2K PS1
WITTENSTEIN ALPHA SP 100X-MC1-7-0G1-2K-KF 7:1 GEAR REDUCER D287303
WITTENSTEIN ALPHA SP 100S-MF2-28-1E1-2S 24MM 32MM 28:1 GEARHEAD REDUCER B464293
WITTENSTEIN ALPHA SP 100S-MC1-3 - 0K0-2K Getriebe Planetengetriebe NEU
Wittenstein Alpha SP 075S-MF1-3-1E1-2S Gearhead 3:1 Ratio 103mm Frame Size
Wittenstein Alpha SP 060S-MF1-5-1B1-2S Gearhead 5:1 Ratio 70mm Frame Size
Wittenstein Alpha SP 060S-MF1-3-1C1-2S Gearhead 3:1 Ratio 70mm Frame
Wittenstein Alpha SP 060S-MF1-3-1B1-2S Gearhead 3:1 Ratio 70mm Frame Size
Wittenstein Alpha SP 060S-MF1-10-181-125 Gearhead 10:1 Ratio 70mm Frame
Wittenstein Alpha SK+100S-MF2-50 Right Angle Gear Head Reducer
WITTENSTEIN ALPHA SK+ 140S-MF1-7 -1K1-P&G
Wittenstein Alpha SK+ 100S-MF1-5 -2H1-1K Getriebe Winkelgetriebe Umlenkgetriebe
Wittenstein Alpha Right-Angle Gear Reducer, 40:1 Ratio
WITTENSTEIN ALPHA RIGHT ANGLE 42 PLANETARY GEAR REDUCER TPK 025-MF3-42-031-000
WITTENSTEIN ALPHA RATIO 7 PLANETARY GEARHEAD SP 140-MF1-7 -421-000
WITTENSTEIN ALPHA RATIO 5 PLANETARY GEARHEAD SP 140-MF1-5 -421-000
Wittenstein Alpha Planetengetriebe TP 010-MF2-91-031-000 -  -
Wittenstein alpha Planetengetriebe SP075S-MC2-70-0C1-2K Getriebe #7484
Wittenstein alpha Planetengetriebe SP 060S-MF2-16-0B1-2S Getriebe #7830
Wittenstein Alpha LPK070-M03-25 Servo Planetary Gearhead 25:1 Ratio - 
Wittenstein Alpha LPK 090-M02-3-111 Right-Angled Gearhead 3:1 Ratio
Wittenstein Alpha LPK 070-M03-25-111 Right Angle Gear Reducer 25:1 Ratio
Wittenstein Alpha LP-050S-MF1-10-1B1-3S Gearhead LP050SMF1101B13S 
WITTENSTEIN alpha LP 155-MO2-50-111-000
Wittenstein Alpha LP 120-M02-16-111-000 Servo Gear Head Reducer
WITTENSTEIN ALPHA LP 090-M01-3-111-001 GEAR REDUCER, 
WITTENSTEIN ALPHA LP 070-M02-15-111-000  GEAR HEAD LP070M0215111000
Wittenstein Alpha LP 070-M01-7-111-000 Gearhead 7:1 Ratio 70mm Frame Size
WITTENSTEIN ALPHA LP 070-M01-10-111-000 10:1 GEAR REDUCER POWER TRANSMISSION
Wittenstein Alpha HG+ 100S-MF1-10-6H1-1K00 Right Angle Planetary Gear Reducer
Wittenstein Alpha Gmbh LP070-M01-7-111-000 Gearhead LP070M017111000 
Wittenstein Alpha Getriebe TP 050S-MF2-16 OK1-25 --
Wittenstein alpha getriebe SP 140S-MF1-10 -011-25
Wittenstein Alpha Getriebe Kegelradgetriebe SK 060S-MF2-20-1B1-1S10 mit Motor
Wittenstein ALPHA Getriebe alpheno 040-1 i=4 --
WITTENSTEIN alpha Getribe SK.140S-MF 1-3 - 1K1
WITTENSTEIN ALPHA GEARHEAD SP 140S-MF1-7 NNB
WITTENSTEIN ALPHA GEARBOX SP 140S-MF2-16 -1K0-2S
WITTENSTEIN ALPHA GEARBOX SK-1405-MF1-4-0K-1K00 **
Wittenstein Alpha Gearbox
Wittenstein Alpha Gearbox
Wittenstein Alpha Gear Head with shaft. LP 050S-MF1-10-1B1-3S (4 units)
Wittenstein Alpha Gear Box Reducer LPK-090-M02-3-111 Ratio 3:1 Right Angle
WITTENSTEIN ALPHA 7:1 RATIO PLANETARY GEAR REDUCER SP 140S-MF1-7-0K1-2S
Wittenstein alpha 1000mm Mod 2 perbance class rack
WITTENSTEIN ALPHA 10:1 RATIO PLANETARY GEAR REDUCER SP 060S-MF1-10-0B1-2S
WITTENSTEIN ALPHA 090-MO1-10-111-000 RATIO:10 10000967 GEAR REDUCER
Wittenstein Alpha -- SP 060S-MF1-5-1B1-2S -- High Speed Gear Reducer ()
Wittenstein Alpha -- SP 060S-MF1-5-1B1-2S -- High Speed Gear Reducer ()
WITTENSTEIN alpha - Planetengetriebe SP MF-Version i=4 - SP 140S-MF1-4 -4K1-2S
Wittenstein / alpha Planetengetriebe SP075S-MF1-5-1G0-2S OVP
Wittenstein / alpha Planetengetriebe SP 075S-MF1-10-0E0-2S OVP
Wittenstein / alpha Planetengetriebe SP 075S-MF1-10-0E0-2S NOV
Wittenstein / alpha Planetengetriebe SP 075S-MF1-10-0E0-2S GEB
Wittenstein / alpha Getriebe HG+ 075S-MF2-20-6C1-1S10 20034772 OVP
WIREMASTER FIT-221-1/8 TUBING, HEATSHRINK,IN=RL, 45 FT ALPHA WIRE
WIRE, YEL, 32AWG, 7/40AWG, 30.5M MPN: 2840/7 YL005 ALPHA WIRE
WIRE, YEL, 28AWG, 7/36AWG, 30.5M MPN: 3048 YL005 ALPHA WIRE
WIRE, YEL, 28AWG, 19/40AWG, 30.5M MPN: 2842/19 YL005 ALPHA WIRE
WIRE, YEL, 26AWG, 7/34AWG, 30.5M MPN: 5853 YL005 ALPHA WIRE
WIRE, YEL, 24AWG, 7/32AWG, 30.5M MPN: 3050 YL005 ALPHA WIRE
WIRE, YEL, 22AWG, 7/30AWG, 30.5M MPN: 3251 YL005 ALPHA WIRE
WIRE, YEL, 22AWG, 19/34AWG, 30.5M MPN: 5855 YL005 ALPHA WIRE
WIRE, YEL, 20AWG, 10/30AWG, 30.5M MPN: 3053 YL005 ALPHA WIRE
WIRE, YEL, 18AWG, 16/30AWG, 30.5M MPN: 1555 YL005 ALPHA WIRE
WIRE, YEL, 16AWG, 19/29AWG, 30.5M MPN: 5858 YL005 ALPHA WIRE
WIRE, WHT, 32AWG, 7/40AWG, 30.5M MPN: 2840/7 WH005 ALPHA WIRE
WIRE, WHT, 30AWG, 7/38AWG, 30.5M MPN: 1851 WH005 ALPHA WIRE
WIRE, WHT, 28AWG, 7/36AWG, 30.5M MPN: 3048 WH005 ALPHA WIRE
WIRE, WHT, 28AWG, 7/36AWG, 30.5M MPN: 2842/7 WH005 ALPHA WIRE
WIRE, WHT, 28AWG, 7/36AWG, 30.5M MPN: 1852 WH005 ALPHA WIRE
WIRE, WHT, 28AWG, 19/40AWG, 30.5M MPN: 2842/19 WH005 ALPHA WIRE
WIRE, WHT, 26AWG, 7/34AWG, 30.5M MPN: 1853 WH005 ALPHA WIRE
WIRE, WHT, 26AWG, 19/38AWG, 30.5M MPN: 2843/19 WH005 ALPHA WIRE
WIRE, WHT, 24AWG, 7/32AWG, 30.5M MPN: 1550 WH005 ALPHA WIRE
WIRE, WHT, 22AWG, 7/30AWG, 30.5M MPN: 5855/7 WH005 ALPHA WIRE
WIRE, WHT, 22AWG, 1/22AWG, 30.5M MPN: 1561 WH005 ALPHA WIRE
WIRE, WHT, 20AWG, 10/30AWG, 30.5M MPN: 3053 WH005 ALPHA WIRE
WIRE, WHT, 20AWG, 1/20AWG, 30.5M MPN: 2856/1 WH005 ALPHA WIRE
WIRE, WHT, 18AWG, 16/30AWG, 30.5M MPN: 3055 WH005 ALPHA WIRE
WIRE, WHT, 12AWG, 19/25AWG, 30.5M MPN: 5859/12 WH005 ALPHA WIRE
WIRE, WHT, 10AWG, 105/30AWG, 30.5M MPN: 3081 WH005 ALPHA WIRE
WIRE, VLT, 28AWG, 7/36AWG, 30.5M MPN: 2842/7 VI005 ALPHA WIRE
WIRE, VLT, 20AWG, 10/30AWG, 30.5M MPN: 3053 VI005 ALPHA WIRE
WIRE, UL1429, 26AWG, BLUE, 304.8M MPN: 7053 BL001 ALPHA WIRE
WIRE, UL1213, 30AWG, ORANGE, 30.5M MPN: 5851 OR005 ALPHA WIRE
WIRE, UL1213, 26AWG, WHITE, 304.8M MPN: 5853 WH001 ALPHA WIRE
WIRE, UL1213, 24AWG, WHITE, 304.8M MPN: 5854/7 WH001 ALPHA WIRE
WIRE, UL1213, 20AWG, RED, 304.8M MPN: 5856 RD001 ALPHA WIRE
WIRE, UL1061, 24AWG, YELLOW, 305M MPN: 3250 YL001 ALPHA WIRE
WIRE, UL1061, 20AWG, BLACK, 305M MPN: 3252 BK001 ALPHA WIRE
WIRE, UL1015, 24AWG, ORANGE, 305M MPN: 3070 OR001 ALPHA WIRE
WIRE, UL1015, 24AWG, BLACK, 305M MPN: 3070 BK001 ALPHA WIRE
WIRE, UL1015, 22AWG, YELLOW, 305M MPN: 3071 YL001 ALPHA WIRE
WIRE, UL1015, 20AWG, RED, 305M MPN: 3073 RD001 ALPHA WIRE
WIRE, UL1015, 20AWG, BROWN, 305M MPN: 3073 BR001 ALPHA WIRE
WIRE, UL1015, 18AWG, BLACK, 305M MPN: 3075 BK001 ALPHA WIRE
WIRE, UL1015, 16AWG, GRN/YEL, 305M MPN: 3077 GY001 ALPHA WIRE
WIRE, UL1007, 28AWG, GREEN, 305M MPN: 3048 GR001 ALPHA WIRE
WIRE, UL1007, 20AWG, GREY, 305M MPN: 3053 SL001 ALPHA WIRE
WIRE, UL1007, 20AWG, BROWN, 305M MPN: 3053 BR001 ALPHA WIRE