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(nèi)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。可編程序控制器及其有關的外圍設備，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(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。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、。
Fanuc A06B-6078-H222 #H500 Spindle Amp Module,Ser A, , WARRANTY
Fanuc A06B-3071-K203 A06B3071K203 Connector 3P CX1A CX4 K3 K6 K7
Fanuc A06B-3071-K203 A06B3071K203 Connector 3P CX1A CX4 K3 K6 K7
FANUC A06B-0652-B002 SERVO MOTOR DC 20M 4X RESOLVER **repair evaluation**
FANUC A06B-0652-B002 SERVO MOTOR DC 20M 4X RESOLVER **repair evaluation**
FANUC A06B-0601-B031 A06B0601B031
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Fanuc A06B-0116-B804 servo motor
Fanuc A05B-2301-C300 Teach Pendant, WIN-10484-SH, , Warranty
Fanuc A02B-0319-C243 Operator's Panel Interface, , WARRANTY
FANUC A02B-0236-K313 A02B0236K313 CONNECTOR 20PIN CM68 CM69
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Fanuc 9" O-M HI-FI MDI/CRT Operator's Panel, A02B-0092-C052, , WARRANTY
Fanuc 7.5 kVA Transformer, A80L-0026-0002 #A-01, , WARRANTY
Fanuc 6M MDI/CRT Display Unit, A02B-0060-C034, With Monitor, , WARRANTY
Fanuc 6 Axis Servo Amplifier Module, A06B-6076-H101, Ser A, , WARRANTY
Fanuc 5/6 Axis Control Circuit Board, A16B-2200-0800 / 08B, , WARRANTY
FANUC 4003-T234 CONNECTOR CABLE
Fanuc 3S/12000 AC Spindle Motor, # A06B-0753-B394 #3000, , CRACKED PLASTIC
Fanuc 30M DC Servo Motor, A06B-0653-B011 (2000M), , WARRANTY
Fanuc 21-T CRT Unit, # A02B-0210-C111, , WARRANTY
Fanuc 21-M CRT Unit, # A02B-0210-C111, , WARRANTY
Fanuc 2-0S A06B-0310-B351 AC 3 Phase 8 Pole Servo Motor w A290-0521-V581 Encoder
Fanuc 20M DC Servo Motor, A06B-0652-B212 (2500M), , WARRANTY
FANUC 2.830" INNER DIAMETER, GEAR J12 A290-7216-X212 * *
Fanuc 18-TC 6 Slot Rack, A02B-0228-B503, , WARRANTY
Fanuc 15-M CRT/MDI Control Panel Display Unit, A02B-0094-C021, , WARRANTY(3)
Fanuc 15-M CRT/MDI Control Panel Display Unit, A02B-0094-C021, , WARRANTY(2)
Fanuc 1-4 Axes Circuit Board, A16B-2200-0390 / 11B, , WARRANTY
Fanuc 11 Series ROM/RAM PC Board, A16B-1211-0291 / 03A, , WARRANTY
Fanuc 10M DC Servo Motor, A06B-0651-B211 (2000M), , Warranty
Fanuc 10M DC Servo Motor, A06B-0651-B011 (2000M), Date: 04.09, , WARRANTY
Fanuc 10.5" Mono 160iM Controller, 16iM-MCU20648-001R00, , WARRANTY
Fanuc 1 / 2 Axis PC Board, # A16B-1212-0501 / 01, , WARRANTY
Fanuc 0-Mate T MDI/CRT Unit, # A02B-0096-C043, O-Mate T, , WARRANTY
Fanuc / General Numeric #2 AC Spindle Motor, # A06B-1002-B600 #2000,
Fanuc .20 Upper Wire EDM Diamond Guide, A290-8021-X765
Fanuc .20 Lower Wire EDM Diamond Guide, A290-8021-X775
Fanuc .20 Lower Wire EDM Diamond Guide, A290-8021-X775
Fanuc #a22/3000 AC Sservo Motor, # A06B-0148-B188, , WARRANTY
Fanuc #a22/2000 AC Servo Motor, # A06B-0147-B176, , WARRANTY
Fanuc #a22/2000 AC Servo Motor, # A06B-0147-B176, 2000 RPM, , Warranty
Fanuc #a22/2000 AC Servo Motor, # A06B-0147-B176 #7000, , WARRANTY, Plastic
Fanuc #8 AC Spindle Motor, # A06B-1008-B102, 7.5/11 kW, , WARRANTY
Fanuc #8 AC Spindle Motor, # A06B-1008-B100, , WARRANTY
Fanuc #8 AC Spindle Motor, # A06B-1008-B100, Flange Mount, , WARRANTY
Fanuc #2 AC Spindle Motor, # A06B-1002-B100, Flange Mount, , Warranty
Fanuc #2 AC Spindle Motor, # A06B-1002-B100, Flange Mount, (2) , Warranty
Fanuc # A6/2000 AC Servo Motor, # A06B-0127-B076, , WARRANTY
Fanuc # A6/2000 AC Servo Motor, # A06B-0127-B076 #7000, , WARRANTY
Fanuc # A12/2000 AC Servo Motor, # A06B-0142-B075-R, , WARRANTY
Fanuc # A12/2000 AC Servo Motor, # A06B-0142-B075, , WARRANTY
Fanuc # 8 / 8000 AC Spindle Motor, # A06B-0855-B102 / 3000-R, (2) , AS IS
Fanuc # 8 / 8000 AC Spindle Motor, # A06B-0855-B102 #3000, , WARRANTY
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Fanuc # 3 AC Spindle Motor, # A06B-1003-B100, 1500/6000 RPM, (8) , WARRANTY
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Fanuc # 0S AC Servo Motor, # A06B-0313-B002 #7000, 2000 RPM, Mfg'd: 11.12,
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Etamic Opticline Optical Shaft Measuring Base, # CSZ SP, E401331, , WARRANTY
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ESA NSK Servo Driver Unit, ESA-J1003A25-21, , WARRANTY
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Emerson Brushless AC Servo Drive, # LX-700, 180031-01, , WARRANTY
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