影響PLC控制系統(tǒng)的干擾源于一般影響工業(yè)控制設(shè)備的干擾源一樣，大都產(chǎn)生在電流或電壓劇烈變化的部位，這些電荷劇烈移動的部位就是噪聲源，即干擾源。
干擾類型通常按干擾產(chǎn)生的原因、噪聲的干擾模式和噪聲的波形性質(zhì)的不同劃分。其中：按噪聲產(chǎn)生的原因不同，分為放電噪聲、偶發(fā)噪聲等：按聲音干擾模式不同，分為共模干擾和差模干擾是一種比較常用的分類方法。共模干擾是信號對地面的電位差，主要是由電網(wǎng)串入，、地電位差及空間電磁輻射在信號線上感應(yīng)的共態(tài)電壓所加形成。共模電壓有時較大，特別是采用隔離性能差的電器供電室，變送器輸出信號的共模電壓普遍較高，有的可高達(dá)130V以上。共模電壓通過不對稱電路可轉(zhuǎn)換成共模電壓，直接影響測控信號，造成元器件壞，這種共模干擾可為直流、亦可謂交流。共模干擾是指用于信號兩級間得干擾電壓，主要由空間電磁場在信號間耦合感應(yīng)及由不平衡電路轉(zhuǎn)換共模干擾所形成的電壓，這種讓直接疊加在信號上，直接影響測量與控制精度。?
PL Quadrature Counter Card Board, # 117040-002, Used, W...
Conair 4-unit (Relay) Sensor Circuit Board, 108-518-4,...
Cincinnati Milacron Output Board, # 3 531 3564A, Used, ...
Cincinnati Milacron Output Board, # 3 531 3563A, Used, ...
Okuma Relay Card 1-3, E4809-770-035, Used, WARRANTY
Hallicrafters Conta Clip Circuit Board Card, 50 pin D-S...
Sundstrand PC Board, 65000025, Used, WARRANTY
Sundstrand PC Board, 65000679 (1-*), Used, WARRANTY
Samsomatic Analog Mounting Rack Board, # PWA 27-1027,Us...
SCI / Van Dorn Gate Expander Module, # 180-2355, 080-23...
Fanuc Memory Module, # A16B-1211-0860 / 04A, Used, WARR...
Allen Bradley PC Control Board, # 8000-GDB, 900018, Rev...
KITAMURA MYCENTER 1 CIRCUIT BOARD, KITAMURA 401B, Used,...
Fujitsu Limited IDE Hard Drive, # MPE3084AE-AL, Used, W...
Deemstop Contact Board, # PCB 6290, Used, WARRANTY
NEW Mini Control Relay Board w/ Cordset, # 493145, 1118...
Gordos Crouzet Relay Mounting Board, CPX-7D, PB-24, USE...
SCI / Van Dorn System Board, # 081-2306, Revision D, 18...
Phoenix Contact Board, # UM45-SEFE, 2962816 WARRANTY
Gordos Crouzet Relay Mounting Board, # PB-16, w/o Relay...
Fanuc RH Path CPU Board, # A16B-1211-0030/?02A, Used, WA...
Fanuc RH Path CPU Board, # A16B-1211-0030/?03A, Used, WA...
Fanuc PC Circuit Board, # A16B-1211-0170/?11E, Used, WA...
Fanuc RH Path CPU Board, # A16B-1211-0030 / 04A, Used, ...
SCI / Van Dorn Circuit Board, # 080-2310-4, 180-2310-4,...
Hurco / MGV 16 MB Memory Board, G1604326/7, 16MB 4X32, ...
Fanuc PCB Circuit Board, # A20B-0007-0070 / 06B, * * US...
SCI / Van Dorn Circuit Board, # 080-2310-4, 180-2310-4,...
Gettys Circuit Board, 14-0024-05, Rev. A, WARRANTY
Fanuc PC Control Board, # A20B-0007-0070 / 05B,?
Allen Bradley Error Correcting Memory Board, 1775-MEA, ...
Western Reserve Controls Discrete I/O Module 1781-A16T,...
Elox / Colt Industries Thumbwheel Assy, 320063-002, Use...
Viking Components 16 MB Memory Board, # 9636414, 12 Chi...
Viking Components 32 MB Printer Memory Board, # 9528261...
Fanuc F6T/M Rom Memory Board, # A16B-1200-0150, WARRANT...
American Hofmann Circuit Board, # A800.058, Used, WARRA...
American Hofmann Keyboard Interface Board, # A800.021, ...
Opto 22 Machine Process Controller Brain Board B4, 0017...
Opto 22 Machine Process Controller Brain Board B4, 0017...
Opto 22 Machine Process Controller Brain Board B4, 0017...
Air Gage Company Motion Controller Interface Card, 0267...
Gettys Circuit Board 11-0090-00, WARRANTY
Fanuc PCB Circuit Board, # A20B-0007-0750 / 03B, A13B-0...
Balluff BIS-C-440-U2-BI?N ID System Processor, BIS-C-440...
SCI / Van Dorn Circuit Board, # 080-2354, Revision D, 1...
Monarch Machine Tool PC Board, # 50304, Used, WARRANTY
Gettys Circuit Board, # 11-0116-00, Revision A, WARRANT...
OPTO 22 I/O Mounting Rack Board, Model# PB32HQ, Used, W...
TEAC FD-235HF 1.44MB 3.5” Floppy Drive, P/N 193077A4-29...
Gettys Power Regulator Board, # 55-0055-00, WARRANTY
Creative Labs Modem Blaster Card, # DI3635-1, WARRANTY
Kyocera Circuit Board, # TK-2C803/865-2J?-D02, Used, WA...
Netgear Ethernet Network Card, EA201 D2, 8EA201...1D2, ...
AEG / Modicon AS-S908-110, Processor Module, Used, WAR...
Curtis Industries Inc. Power Relay Board, Model LHS W...
Sundstrand Relay Board, PA-G1, USED, WARRANTY
Nemic-Lambda Power Supply Board, # SBC035C, Used, Warr...
NEW Mini Control Relay Board, 493145, 111896, Revision ...
Bridgeport Controls Circuit Board, # 028843 SMS,
Schneider Modicon AS-B872-002 I/O Analog Input Module, ...
Show N Tell PC Circuit Board, # CSD-16L120AM2, Used, W...
FANUC PC BOARD A20B-2900-0450/?03B, Used, WARRANTY
Allen Bradley PCB Circuit Board, # 634275, Revision 6, ...
Landis Binary Rate Multiplier Board, # A-81031, Used, W...
Fanuc Circuit Board/Tape Read Board, A20B-0007-0750 / 0...
Gettys Firing Transformer, 415-001-0016, Used, WARRANT...
Fanuc Circuit Board/Tape Reader Board, A20B-0007-0750 /...
Fanuc Tape Reader Board, # A20B-0007-0750 / 07B, Used, ...
Fanuc Circuit Board/Tape Read Board, A20B-0007-0750 / 0...
Actiontec Modem Card, # 37-0103-0020, WARRANTY
Curtis Industries Inc. Power Relay Board, Model LHS W...
Allen Bradley Drive Control Board, # 74102-343-51, WAR...
Opto 22 Term 1 Bus Termination Card, Used, WARRANTY
Adaptec SCSI Raid Controller Card, ASR-2200S/64 MB, Use...
NEW Titchener Wire-Grip Circuit Board Puller, # 1731, ...
Gettys Power Regulator Board, # 55-0050-00, WARRANTY
Allen-Bradley 74102-405 System Slider Module, Used, WAR...
3Com Module Fast Etherlink Card, # 3C905B-TX,?
ABB Robotics Servo Motor, # 1 FT3078-5AZ21-9-?Z-N, Used,...
ABB ACS550 23 Amp Drive # ACS550-U1-023A-?4, Used, WARRA...
ABB 15 HP Motor Controller, P/N G02400A00, Mod# G024, U...
ABB Operator Interface Panel, # S3PC, Used, WARRANTY
ABB AXEM Servo Motor, # MC19S R0025, 3000 RPM, 1.6 kW *...
ABB DSQC 249B DSQC249B Robotic Servo Amplifier Board, U...
ABB 3 Phase Servo Drive, # ACS401600532, Used, WARRANTY
ABB DSQC 254 DSQC254 BackPlane Robot Control PC Board, ...
ABB Capacitor, 7.5 KVAR, # C484G7.5-3LE, Used, WARRANT...
ABB Capacitor, 10KVAR, # C484G10-3LE, 3 PH 480 VAC Use...
ABB Robotics Servo Motor, # 1 FT3101-5AZ21-9-?Z, Used, ...
ABB Capacitor 12.5 KVAR, C484G12.5-3LE, 3 PH 480 VAC, U...
ABB GME 3HAA3563-ARA, 92013-313, Robotic Servo 8-Slot B...
ABB Welding Isolation Contactor, EHW 160, USED, WARRANT...
ABB / ASEA Heavy Duty Contactor, EFLG 40-3P, 302AN30P
ABB Welding Isolation Contactor EHW 250C 2P-*L SizeW5
ABB Stromberg Disconnect Switch, OETL-NF30T, 40 Amp, Us...
ABB / Radisys Corp Processor Board, EPC-22, Used, Warra...
ABB / Grayhill 69YY16004 32 Relay Breakout Board, DC: 9...
ABB / Grayhill 69YY16004 32 Relay Breakout Board, DC: 9...
ABB / Grayhill 69YY16004 32 Relay Breakout Board, DC: 9...
ABB / ASEA PC Board, 2668 180-10, WARRANTY
ABB Contactor 302AM30P Heavy Duty Contactor, EFLG 30 RP
Radisys Corp Power Supply, EMC-PS50, Used, Warranty
ABB Contactor BC25-40-00 24VDC Coil, 20HP @ 460V, Used,...
ABB / Vellinge Circuit Board DSQC 223, P/N 56 01-03, Re...
ABB Contactor Relay, K40E, 120VAC Coil, 10A, 600V, Used...
ABB Contactor BC25-30-10 24VDC Coil, 20HP @ 460V, Used,...
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ABB B30C-* Contactor, 45A, 3PH. 20HP @ 460V, 120V Coil
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