国际电工委员会(IEC)在1985年的PLC标准草案第3稿中，对PLC作了如下定义：“可编程序控制器是一种数字运算操作的电子系统，专为在工业环境下应用而设计。它采用可编程序的存储器，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的指令，并通过数字式、模拟式的输入和输出，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设备，都应按易于使工业控制系统形成一个整体，易于扩充其功能的原则设计。”从上述定义可以看出，PLC是一种用程序来改变控制功能的工业控制计算机，除了能完成各种各样的控制功能外，还有与其他计算机通信联网的功能。
PLC的推广应用在我国得到了迅猛的发展，它已经大量地应用在各种机械设备和生产过程的电气控制装置中，各行各业也涌现出了大批应用PLC改造设备的成果。了解PLC的工作原理，具备设计、调试和维护PLC控制系统的能力，已经成为现代工业对电气技术人员和工科学生的基本要求。
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FAG 63112ZG3 DEEP GROOVE BALL BEARING SINGLE ROW DOUBLE SHIELDED
FAG NU214E.TVP2 ROLLER BEARING FAG NU214-E-TVP2 BEARING
FAG NU308ETVP2 CYLINDRICAL ROLLER BEARING
FAG SINGLE ROW DOUBLE SHIELDED BALL BEARING 12mm IDX32mmODX10mm 6201.2ZR
FAG SNV 062 PILLOW BLOCK HOUSING TWO BOLT FLANGE SPLIT PILLOW BLOCK
FAIRCHILD 1/4" VOLUME BOOSTER 1-5 UNITS 250 PSIG SUPPLY 150 SIGNAL 20882
FAIRCHILD 207102 VOLUME BOOSTER 1/8" NPT 250 PSIG SUPPLY MODEL 20
FAIRCHILD 207102 VOLUME BOOSTER 1/8" NPT 250 PSIG SUPPLY MODEL 20
FALCON 208-240 VOLT OUTPUT UPS BATTERY BACKUP SG1KRM-2TU 1000VA/700W
FALK 0704609 GRID COUPLING HUB SIZE 1040 1-1/2" BORE 3/8 X 3/16 KW
FALK 0744992 EXPOSED BOLT FLANGED COUPLING SLEEVE SIZE 1020G 7" OD
FALK 0758299 STEELFLEX COVER GRID ASSEMBLY FOR 60 & 1060T20 COUPLINGS
FALK 0769158 TAPERED BUSHING SPEED REDUCER
FALK 0769158 TAPERED BUSHING SPEED REDUCER
FALK 1030T31/35 SPACER HUB CL=2.375 FALK 0744087
FALK 1040G 51 SLEEVE COUPLING HUB 3.9975 BORE 9J1669 14 BOLT FALK 1203656
FALK 20:1 WORM GEAR SPEED REDUCER 1175WOM3A .14 HP FRAME AB
FALK 20:1 WORM GEAR SPEED REDUCER 1175WOM3A .14 HP FRAME AB
FALK 20:1 WORM GEAR SPEED REDUCER 1175WOM3A .14 HP FRAME AB
FALK 25.03:1 RATIO ENCLOSED HORIZONTAL GEAR DRIVE MODEL 4115J 25
FALK 4.434 COULING HUB 1110T 1X1/2 KW 0744041
FALK 40G10/51 DOUBLE ENGAGEMENT GEAR COUPLING B/M 711132
FALK 704637 FLEX HUB SIZE 1070T 1-3/8" BORE
FALK 706393 GRID COUPLING GRID SIZE 10
FALK GRID COUPLING HUB SIZE 1070T STANDARD GRIP TAPER HUB FOR 70 & 1070T RSB
FALK GRID COUPLING HUB SIZE 1070T STANDARD GRIP TAPER HUB FOR 70 & 1070T RSB
FANUC A14B LASER POWER SUPPLY MODEL A14B-0082-B105-03
FANUC A14B-0082-B003-01 POWER SUPPLY UNIT
FANUC A16B-3200-0040/06D MAIN CPU PCB PROCESSOR CPU CIRCUIT BOARD
FANUC AC SERVO MOTOR A06B-0353-B831
FANUC AC SERVO MOTOR TYPE A06B-0502-B754 MODEL 20S
FANUC AC SERVO MOTOR TYPE A06B-0502-B754 MODEL 20S
FANUC ANALOG INPUT MODULE A03B-0807-C104
FANUC ANALOG INPUT MODULE A03B-0807-C154
FANUC BRAND-REX ROBOT PULSE CABLE EE-3285-121-003
FANUC CIRCUIT BOARD MEMORY MODULE A350-2902-T376/02
FARR TENKAY AIR FILTER ELEMENT 72518-001
FARRIS 1-1/2" X 2" PRESSURE RELEIF VALVE WCB CARBON STEEL 26FA13-120
FARRIS 1-1/2" X 3" -H PILOT OPERATED PRESSURE RELEIF VALVE 38HC12-125
FASCO 1/10 HP SHADED POLE ELECTRIC MOTOR 7162-1634 VAC U62
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FASCO IRON UNIT BEARING MOTOR 230 VAC 50 WATT 1550 RPM MODEL D580
FAST HEAT BM031113 BAND HEATER AS-BM-1186 840 W 230 V 1" WIDE X 7"
FAST HEAT BM031113 BAND HEATER AS-BM-1186 840 W 230 V 1" WIDE X 7"
FAST HEAT BM22461 BAND HEATER 300 WATT 240 V 3/4" WIDE X 4" INNER DIA
FAST HEAT BM22461 BAND HEATER 300 WATT 240 V 3/4" WIDE X 4" INNER DIA
FAST HEAT BMX 19207 BAND HEATER 375 WATT 240 VOLT 1-1/2" WIDE X 3-1/2"
FAST HEAT H6 180G 4 79 CARTRIDGE HEATER 1450 WATT 240 VAC
FAST HEAT STAINLESS STEEL HEATING ELEMENT 6" PROBE SH 2521 4 85
FATA SQUARE D 2 UNIT PUSHBUTTON ENCLOSURE START-STOP E-STOP
FEDERAL MOGUL BCA A-38 WHEEL BEARING AND RACE SET
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FEDERAL MOGUL BCA MODEL 752 TAPERED BEARING
FEDERAL PACIFIC CA206M COIL 208/220V 60CY FOR SIZE 2 STARTERS AND CONTACTORS
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FEDERAL SIGNAL ELECTRAFLASH 141 AMBER LIGHT 36 VDC 33 WATTS MODEL No. 141
FEDERAL SIGNAL K149123A INCANDESCENT LAMP 120 VAC
FEDERAL SIGNAL K149123A INCANDESCENT LAMP 120 VAC
FEDERAL SIGNAL LSL-120C CLEAR LITESTAK 120 VAC
FEDERAL SIGNAL SELECTONE 300GC 120 V WITH HORN & YELP TONE MODULE TM2
FENWAL 22-100000-497 SPARK IGNITOR 46-3270 IGNITOR
FENWAL 27120-0 DETECT A FIRE HEAT DETECTOR
FENWAL 27120-0 DETECT A FIRE HEAT DETECTOR
FENWAL 80016-4 EXPLOSION PROOF THERMOSWITCH CONTROL 115/230 VAC 10/5 AMP
FENWAL THERMOSWITCH TEMPERATURE CONTROLLER 120/240 VAC 18021-0
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FERRAZ SEMICONDUTOR PROTISTOR FUSE 300 AMP 700 VOLT A070F300
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FESTO ADVUL-16-25-P-A COMPACT CYLINDER 156855 1.2 BAR-10 BAR 1" STROKE
FESTO COMPACT PNEUMATIC CYLINDER 3-5/8" STROKE 1/8" PORT ADVU-80-90-A-P-A
FESTO COMPACT PNEUMATIC CYLINDER 3-5/8" STROKE 1/8" PORT ADVU-80-90-A-P-A
FESTO DGPL-1"-6-PPV-A-GF-B RODLESS LINEAR ACTUATOR W/GUIDE 25MM TRAVEL
FESTO DGPL-1"-6-PPV-A-GF-B RODLESS LINEAR ACTUATOR W/GUIDE 25MM TRAVEL
FESTO ENCODER CABLE NEBM-M12G8-E-5-S1G9
FESTO GR-3/8B ONE WAY FLOW CONTROL VALVE 3/8" NPT SERIES B
FESTO GR-3/8B ONE WAY FLOW CONTROL VALVE 3/8" NPT SERIES B
FESTO GRLA-1/8-B CONTROL VALVE
FESTO GRLA-1/8-B CONTROL VALVE
