BAUMULLER BUR622-16-2

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销售专员  林惠燕

   PLC采用循环扫描的工作方式，在PLC中用户程序按先后顺序存放

，CPU从条指令开始执行程序，直到遇到结束符后又返回条

，如此周而复始不断循环。PLC的扫描过程分为内部处理、通信操作

、程序输入处理、程序执行、程序输出几个阶段。全过程扫描一次

所需的时间称为扫描周期。当PLC处于停状态时，只进行内部处理和

通信操作服务等内容。在PLC处于运行状态时，从内部处理、通信操

作、程序输入、程序执行、程序输出，一直循环扫描工作。

      1．输入处理

      输入处理也叫输入采样。在此阶段，顺序读入所有输入端子

的通端状态，并将读入的信息存入内存中所对应的映象寄存器。在

此输入映象寄存器被刷新。接着进入程序执行阶段。在程序执行时

，输入映象寄存器与外界隔离，即使输入信号发生变化，其映象寄

存器的内容也不会发生变化，只有在下一个扫描周期的输入处理阶

段才能被读入信息。 

 9/16-12 UNC HS SPLIT ROUND DIE D542363

WIDELL 633285 HSS M20X2.5 DIE D542360

TAYLOR M31X3.5 HSS DIE D542355

DORMER UNC HSS 1-1/8 IN DIE D542350

WILLIAMS C-72 ROUND NOSE CHISEL TOOL 1/4IN D594250

DORMER UNF HSS 1-1/8 IN DIE D543145

STANLEY 14-120 GLASS CUTTER D594509

CROSBY G-450 1010211 WIRE ROPE STEEL CLIP 7/8 IN CLAMP D557029

STEEL U-BOLT CLIP 7/8 IN WIRE ROPE CLAMP D557027

CROSBY G-450 1010195 RED-U-BOLT CLIP 3/4 IN WIRE ROPE CLAMP D557037

CROSBY G-450 1010051 RED-U-BOLT CLIP 1/4 IN WIRE ROPE CLAMP D557042

CROSBY RED-U-BOLT G-450 1010275 STEEL CLIP 1-1/4 IN WIRE ROPE CLAMP D557052

SOLID SQUARE 1NC8 DIE 1IN D546139

BERGMAN 100 GEARENCH GREEN SPANNER 8IN WRENCH D570021

EL-MAC SIZE 0C DOUBLE ENDED SPANNER 8IN WRENCH D570008

TITAN SIZE 0 DOUBLE ENDED STEEL 8IN SPANNER WRENCH D570014

EL-MAC NO 10 RED SPANNER 10IN WRENCH D569771

EL-MAC NO 3 SURE-GRIP 9IN VALVE HAND WHEEL WRENCH D569775

RIDGE TOOL 12-R RIDGID 1/8 IN NPT DIE D543179

EL-MAC NO 11 SURE-GRIP SPANNER WRENCH 11 IN D570022

RIDGID 35815 1/8IN NPT PIPE TAP D590138

BERGMAN NO 102 SAFETY SPANNER WRENCH D567914

BERGMAN NO 100 SAFETY SPANNER WRENCH 8IN D567920

EL-MAC NO 10 SPANNER WRENCH 10IN D567929

EL-MAC NO 9 SURE-GRIP SPANNER WRENCH 9IN D567927

CS OSBORNE LEATHER/GASKET MATERIAL 1-3/8 IN STEEL PUNCH D560911

CS OSBORNE LEATHER/GASKET MATERIAL 1-5/16 IN STEEL PUNCH D560922

CROSBY G-450 1010211 WIRE ROPE STEEL CLIP 7/8 IN CLAMP D580723

CS OSBORNE HOLE 15/16 IN PUNCH D561764

CS OSBORNE HOLE 7/8 IN PUNCH D561765

SPEARHEAD HOLE 1-1/16 IN PUNCH D561771

GENERAL HOLE 7/8 IN PUNCH D561767

CS OSBORNE ARCH PUNCH 1 IN PUNCH D561768

GENERAL HOLE 5/16 IN PUNCH D561755

OSBORN HOLE 11/16 IN PUNCH D561762

GENERAL HOLE 3/4 IN PUNCH D561778

CS OSBORNE ARCH PUNCH 13/16 IN PUNCH D561748

CS OSBORNE 1-3/16 IN PUNCH D561725

SPEARHEAD LEATHER/GASKET MATERIAL STEEL 1-5/16 IN PUNCH D561733

CS OSBORNE LEATHER/GASKET MATERIAL 1-1/8 IN STEEL PUNCH D561732

KENNAMETAL 4 3/8-24NF H3 3FLT SS SPI PT TAP D572106

BERGMAN NO 102 SAFETY SPANNER WRENCH D568606

BERGMAN NO 102 SAFETY SPANNER WRENCH RED D568608

BERGMAN NO 102 SAFETY SPANNER WRENCH D592100

INGERSOLL RAND 22473151 STAINLESS AIR COOLER UNIT D542569

TRANTER PHE UX-296-HP-87 SUPERCHANGER 115PSI @ 200F PLATE HEAT EXCHANGER D540228

HITACHI F-332C-83V-4Z-MO-A-W VX DIFFUSION FURNACE HEATER ELEMENT D586423

ATLAS COPCO 2900 0267 00 AFTERCOOLER CORE D560946

CARLYLE 06NW2174T6NA-A00 296M3/HR SCREW COMPRESSOR 575V-AC 37KW D517876

AEROFIN TYPE R SPIRAL FIN WATER COIL 28-1/2X25X12-1/4IN 2IN NPT D550698

MCLEAN HB11-0216-G306 AIR CONDITIONER 2200BTU 645W 115V-AC D589368

ZERO MCLEAN MIDWEST CR43-0626-002 PROAIR AIR CONDITIONER 230V 6000BTU/HR D517264

DAIKIN AKZ328 INVERTER OIL COOLING UNIT 1.75KVA 220V-AC D596680

CHROMALOX UB-4002 3PH FORCED AIR UNIT HEATER 480V-AC 40KW D545155

PENTAIR CR230216G002 AIR CONDITIONER 115V-AC 410/469W 1400/1600BTU D580856

HOFFMAN M330446G0 BTU AIR CONDITIONER 460V-AC 1084/1172W D550699

MCLEAN CR29-0426-G017H PROAIR STAINLESS AIR CONDITIONER 230V 4000BTU/HR D562553

SKF TIH 050 INDUCTION HEATER 460V-AC 5KVA D560138

CHROMALOX UB-1502E 3PH FORCED AIR HEATER 1330CFM 15KW 115/480V-AC D593495

MCLEAN M280646G400 AIR CONDITIONER ASSEMBLY 460V-AC 5400/6000BTU/HR D534042

WATLOW 6-1-17-27ML IMMERSION HEATER 575V-AC 51660W D561299

ICE QUBE IQ5000VXS SPECIAL PURPOSE AIR CONDITIONER 90-320PSI 230V-AC D593359

PENNBARRY ZC10 POWER VENTILATOR 3PH 1.5HP 460V-AC D593433

WATLOW FPNA40G5S FLANGE IMMERSION HEATER 30KW 480V-AC 6IN 150 D593111

EXAIR 4730SS NEMA 4X CABINET COOLER SYSTEM KIT 2000 BTU/HR D591937

COPELAND 6RP2-3500-TSK COPELAMETIC AIR CONDITIONER COMPRESSOR UNIT D517742

DUNHAM BUSH 204PHFCFRMFAR60 COMPRESSOR 460V-AC 3PH 22/502REFRIG 142LRA D515415

TRANE UHSB1323EAA20000000 2000CFM STEAM/HOT WATER UNIT HEATER 115V D543426

EXAIR 4730SS NEMA 4X CABINET COOLER SYSTEM KIT 2000BTU/HR D591891

TRANE UHSB1323EAA20100000 2000CFM STEAM/HOT WATER UNIT HEATER 115V D542957

WATLOW FONA18A5 FLANGE IMMERSIBLE HEATING ELEMENT 6KW 4IN 480V-AC D591707

WATLOW FONA18A13W FLANGE IMMERSIBLE HEATING ELEMENT 2KW 4IN 480V-AC D591709

CHROMALOX LUH-D-15-83-34-00 HORIZONTAL UNIT HEATER 208V-AC 15KW D535944

QMARK MUH-10-4 UNIT HEATER 650CFM 10000W 480V-AC D593579

QMARK MUH05-21 ELECTRIC UNIT HEATER 3PH 350CFM 5KW 208/240V-AC D593669

CHROMALOX EUL25B83C EU SERIES UNIT HEATER 25KW 600V-AC D585756

WELLMAN K YN29NA8K130 PA IMMERSION HEATER 30KW 480V-AC 3PH D591840

CHROMALOX EMTI-3075E4 40-1/2IN IMMERSION HEATER 3PH 7500W 480V-AC D591835

DAYTON 2YU41 CONVECTION CEILING HEATER 18.1A 5000W 277V-AC D587365

DAYTON 2YU41 CONVECTION CEILING HEATER 18.1A 5000W 277V-AC D587362

TRENT FO/SP 910-746 ELECTRIC HEATING APPLIANCE 480V-AC 16KW D559038

COPELAND CRM3-0400-PFV-270 208-230V-AC REFRIGERATION COMPRESSOR D562837

COPELAND CRH3-0275-PFV-270 COMPRESSOR 208-230V-AC D563241

ABB 7268-01 THERMAL TRANSFER 2 PASS WATER COOLED HEAT EXCHANGER D518613

NYB 2017-04057-01 SIZE 155 INDUSTRIAL UNIT HEATER 460V-AC 0.5HP D578921

EMERSON ARMTO-2205E2T2 CHROMALOX IMMERSION HEATER 60-250F 17-3/4IN D588875

XCHANGER C-150 37318 STEEL HEAT EXCHANGER 4IN AIR 1IN LIQUID FITTINGS D550194

ITT 5- HCFB HEAT EXCHANGER 2X3 IN NPT 300PSI @ 300F D546079

TRANE UHSB0961TAA101A HORIZONTAL HEATER UNIT 115V-AC D543539

TRANE UHSB0961TAA101B HORIZONTAL HEATER UNIT 115V-AC D544057

ITT HCF HEAT EXCHANGER 300PSI SHELL 150PSI TUBE D586030

ITT 5-260-06-036-001 HEAT EXCHANGER 150PSI @ 375F 2 IN NPT D546001

TECUMSEH AJA4492YXD R-134A REFRIGERATION RECIPROCATING COMPRESSOR 230V D582559

3M W-2862 VORTEX AIR COOLER COOLING ASSEMBLY D592983

MULTI-WING 5ZL 6-BLADE Z-SERIES AXIAL FAN 36IN D595396

AMERICAN INDUSTRIAL UCS-1224-120275 1211 SHELL 300PSI TUBES 150PSI D511972

CARLYLE 06DM8246AC0600B AIR CONDITIONING COMPRESSOR 1800RPM 460V-AC D524432

HIGH-Q HQ2011 DURATHERM LARGE EQUIPMENT HEATER 600V-AC 1000W D577804

TRENTON FO/SP 923-214 HEATING APPLIANCE 480V-AC 6KW D514537

45IN ALL ANGLE HEATER 6KW 208/240V-AC D560024

CHROMALOX ARMTO-2155T1 OIL IMMERSION HEATER 0-100F 1500W 120V-AC D595689

POWER HOUSE TOOLS HDH1.165X39.4B-3 SPEED HEATER 240V-AC D569199

POWER HOUSE TOOLS HDH1.165X35.5B-3 SPEED HEATER 240V-AC D569200

POWER HOUSE TOOLS HDH1.165X29.6B-3 SPEED HEATER 240V-AC D569210

MCLEAN 52-0526-001 AIR CONDITIONER ASSEMBLY 230V-AC 5000BTU/HR D526925

SWEP B35X30 STAINLESS INDUSTRIAL HEAT EXCHANGER D575828

SWEP B35-030 STAINLESS INDUSTRIAL HEAT EXCHANGER D575827

POWER HOUSE TOOLS HDH1.165X43.5B-3 SPEED HEATER 240V-AC D569188

AMERICAN INDUSTRIAL STS-1202-A4-FP 1-1/2 X 2 IN NPT HEAT EXCHANGER 300F D551764

CHROMALOX 196 032951 003 IMMERSION HEATING ELEMENT 480V-AC 2700W D537116

AMERICAN INDUSTRIAL STS-1202-A4-FP 1-1/2 X 2 IN NPT HEAT EXCHANGER 300F D550744

AMERICAN INDUSTRIAL STS-1202-A4-FP 1-1/2 X 2 IN NPT HEAT EXCHANGER 300F D550745

ITT B300S-4 5-260-04-036-012 HEAT EXCHANGER SHELL 1X1-1/4 IN NPT D539976

AMERICAN INDUSTRIAL STS-1202-A4-FP 1-1/2 X 2 IN NPT HEAT EXCHANGER 400F D550109

AMERICAN INDUSTRIAL STS-1202-A4-FP 1-1/2 X 2 IN NPT HEAT EXCHANGER 400F D550108

WATLOW 125BC158AX-2913 FISHER 104341-00 HEATER COIL 240V-AC 600W 5FT D558521

GALTEK PUREBOND HEATER KIT WITH CASE D577322

THERMO SCIENTIFIC 103860-04 TEMPCO HEATER ELEMENT 60W 120V-AC D593354

THERMO SCIENTIFIC 103860-02 TEMPCO HEATER 130W 120V-AC D593393

LAIRD TECHNOLOGIES AA- SUPERCOOL THERMOELECTRIC ASSEMBLY D594777

POWER HOUSE TOOLS HDH1.165X25.6B-3 SPEED HEATER 240V-AC D569197

ITT BCF SN503003014001 HEAT EXCHANGER 1IN X 1-1/2IN NPT D595294

THERM-COIL EA-5053 13IN IMMERSION HEATING ELEMENT 5KW 480V-AC D592474

COPELAND M4PH-0025-IAA-141 ASE19C3E-IAA-103 CONDENSING UNIT 115V-AC D596635

TECUMSEH AE220AT-401 1PH HERMETIC COMPRESSOR 115V-AC D562886

JEVI 21617094 TYPE EFRS DUCT HEATER 3X480V 10.2HP 8IN D592324

OGDEN KE-1T1-0011-M1-E PIPE PLUG IMMERSION HEATER 850W 120V-AC D588418

HIGH-Q HQ HOPPER HEAT ELEMENT 1/2IN NPT 24X12IN 480V-AC 1500W D567085

BOWMAN 20-29 IN-LINE HEAT EXCHANGER 3/4 X 1 IN D577248

TECUMSEH AZ0387YS AZ430-US-249 R134A REFRIGERATION COMPRESSOR D582993

ITT BCF SN503003014003 HEAT EXCHANGER 1IN NPT D563414

HEIDELBERG 99603488 ISOPAD FLEXIBLE HEATING HOSE 480V-AC 416W 10FT D589508

AMERICAN INDUSTRIAL BM-202-S 0803 AIR COOLED LIQUID COOLER 300PSI 400F D587851

HOFFMAN DAH101TS TOUCH SAFE HEATER 120V-AC 10W D578326

CHROMALOX MTO-220A IMMERSION HEATER 2000W 120V-AC D584077

HEIDELBERG 99603685 ISOPAD FLEXIBLE HEATING HOSE 480V-AC 6FT D589507

WESTINGHOUSE ECDO72A1Q R22 COMPRESSOR UNIT 480V-AC D564358

CALORITECH PXFT200 PANEL HEATER 1 PHASE 200W 120V-AC D594728

AMERICAN INDUSTRIAL STS-702-A4-FP 3/4 X 1 IN NPT HEAT EXCHANGER 300F D549977

AMERICAN INDUSTRIAL STS-702-A4-FP 3/4 X 1 IN NPT HEAT EXCHANGER 300F D550107