PLC是以微处理器为基础，综合了计算机技术、自动控制技术和通信技术，用面向控制过程面向用户的“自然语言”编程，适应工业环境，简单易懂、操作方便、可靠性高的新一代通用工业控制装置。PLC是在继电器顺序控制基础上发展起来的以微处理器为核心的通用自动控制装置。

可编程序控制器是一种数字运算操作电子系统，专为在工业环境下应用而设计。它采用了可编程序的存储器，用来在其内部存储执行逻辑运算、顺序控制、定时、计数和算术运算等操作指令，并通过数字的、模拟的输入和输出，控制各种类型的机械或生产过程。可编程序控制器及其有关的外围设备，都应按易于与工业控制系统形成一个整体、易于扩充其功能的原则设计。

PLC产品种类繁多，其规格和性能也各不相同。对于PLC，通常根据其结构形式的不同、功能的差异和I/O点数的多少等进行大致分类。

按结构形式分类

根据PLC的结构形式，可将PLC分为整体式和模块式两类。

整体式PLC

整体式PLC是将电源、CPU、I/O接口等部件都集中装在一个机箱内，如图所示。具有结构紧凑、体积小、价格低的特点。小型PLC一般采用这种整体式结构。整体式PLC由不同I/O点数的基本单元（又称主机）和扩展单元组成，基本单元内有CPU、I/O接口、与I/O扩展单元相连的扩展口以及与编程器或EPROM写入器相连的接口等；扩展单元内只有I/O和电源等，而没有CPU。基本单元和扩展单元之间一般用扁平电缆连接。整体式PLC一般还可配备特殊功能单元，如模拟量单元、位置控制单元等，使其功能得以扩展。

2）模块式PLC

模块式PLC将PLC的各组成部分分别做成若干个单独的模块，如CPU模块、I/O模块、电源模块（有的含在CPU模块中）以及各种功能模块。模块式PLC由框架或基板和各种模块组成，模块装在框架或基板的插座上，如图所示。这种模块式PLC的特点是配置灵活，可根据需要选配不同规模的系统，而且装配方便，便于扩展和维修。大、中型PLC一般采用模块式结构。

还有一些PLC将整体式和模块式的特点结合起来，构成所谓的叠装式PLC。叠装式PLC的CPU、电源、I/O接口等也是各自独立的模块，但它们之间是靠电缆进行连接的，并且各模块可以一层层地叠装。这样，不但系统可以灵活配置，还可做得体积小巧。

2.2.按功能分类

根据PLC的功能不同，可将PLC分为低档、中档、。

（1）低档PLC

低档PLC具有逻辑运算、定时、计数、移位以及自诊断、监控等基本功能，还可有少量模拟量输入/输出、算术运算、数据传送和比较及通信等功能，主要用于逻辑控制、顺序控制或少量模拟量控制的单机控制系统。

WAGOKLEMMEN WAGO DOSE DOSENKLEMMEN wählbar: 2273 / 222 / 224 / 273 - NEU
Wagoklemmen Wago Compact Klemmen Dosenklemmen 5 X 0,5(1,0/1,5/2,5mm² 100 Stück
Wagoklemmen Set in Box 100 Stück
WAGO-Klemmen 243-208 50Stck.
Wagoklemmen 2273-203 Verbindungsklemmen von 0,5 - 2,5mm² 100'er Packung - neu
Wagoklemmen 2273- Serie von 0,5 - 2,5mm² Verbindungsklemme Dosenklemme Wagos neu
WAGO-Klemmen 222-415 40 Stck.
WAGO-Klemmen 222-415 40 Stck.
Wagoklemmen 221-415 Verbindungsklemmen 25 Stück für flexible und starre Leitung
Wagoklemmen 221-413 Verbindungsklemmen 50 Stück für flexible und starre Leitung
Wagoklemmen 221-412 Verbindungsklemmen 100 Stück für flexible und starre Leitung
Wagoklemmen 221-412 221-413 221-415 frei wählbar Klemmen Wago Dosen
Wagoklemmen 221- Serie von 0,2 - 4,0mm² Verbindungsklemme Dosenklemme Wagos neu
WAGO-Klemme 750-501 digitale Ausgangsklemme 2-Kanal 24V DC
WAGO-Klemme 750-400 digitale Eingangsklemme DI digital b 2-Kanal 24V DC
WAGO-I/O-SYSTEM 750-306/000-005
WAGO-I/0-SYSTEM 750-602 Bus Power Feed
WAGOBOX Wago Box , Junction
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