电磁干扰源及对系统的干扰
2.1干扰源及干扰一般分类
影响PLC控制系统的干扰源与一般影响工业控制设备的干扰源一样，大都产生在电流或电压剧烈变化的部位，这些电荷剧烈移动的部位就是噪声源，即干扰源。
干扰类型通常按干扰产生的原因、噪声干扰模式和噪声的波形性质的不同划分。其中：按噪声产生的原因不同，分为放电噪声、浪涌噪声、高频振荡噪声等；按噪声的波形、性质不同，分为持续噪声、偶发噪声等；按噪声干扰模式不同，分为共模干扰和差模干扰。共模干扰和差模干扰是一种比较常用的分类方法。共模干扰是信号对地的电位差，主要由电网串入、地电位差及空间电磁辐射在信号线上感应的共态（同方向）电压迭加所形成。共模电压有时较大，特别是采用隔离性能差的配电器供电室，变送器输出信号的共模电压普遍较高，有的可高达130V以上。共模电压通过不对称电路可转换成差模电压，直接影响测控信号，造成元器件损坏（这就是一些系统I/O模件损坏率较高的主要原因），这种共模干扰可为直流、亦可为交流。差模干扰是指作用于信号两极间的干扰电压，主要由空间电磁场在信号间耦合感应及由不平衡电路转换共模干扰所形成的电压，这种让直接叠加在信号上，直接影响测量与控制精度。
2.2 PLC控制系统中电磁干扰的主要来源
GE Fanuc IC660BBA105K Analog Current Source Module
GE Fanuc A06B-0314-B002#7000 AC Servo Motor
GE FANUC 44A399771-G07 USPP 44A399771G07
GE FANUC IC3603A177-AH2 USPP IC3603A177AH2
GE FANUC SERIES SIX PLUS I/O PLC IC600YR560L 115/230 V
GE Fanuc IC660BBD025/IC660BBD025V/IC-660-BBD-025 NEW!!
One-day shipping available
GE Fanuc 90-70 PLC 10 Slot Rack IC697CPU731 9070 90/70
GE Fanuc A06B-0147-B075 AC Servo Motor 395148 Tested
One-day shipping available
GE FANUC IC600CB536 USPP IC600CB536
GE Fanuc Teach Pendant A05B-2518-C370 A05B2518C370
One-day shipping available
GE FANUC 44A398723-G01 USPP 44A398723G01
GE FANUC IC3600QOXA2 USPP IC3600QOXA2
GE FANUC 531X175SSBASM2 NSPP 531X175SSBASM2
GE FANUC IC3600AOAL1B USPP IC3600AOAL1B
GE FANUC IC3600AOAL1C USPP IC3600AOAL1C
GE FANUC IC693CPU352 IC693CPU352-BB CPU MODULE 90-30
GE Fanuc IC655MDL581A Output Module NEW Free Ship
GE Fanuc 90-70 IC697CPU771J IC697CPU771 CPU /w MEM717B
GE FANUC IC3600SVFA1 USPP IC3600SVFA1
GE FANUC SERIES SIX PLC I/O SYSTEM COMPLETE
GE FANUC A06B-0502-B074#7008 SERVO
GE FANUC A20B-1000-0940 CONNECTION UNIT *NEW*
GE FANUC ANALOG INPUT IC600YB843A 1-5VDC/4-20MA
GE Fanuc IC600LR648K Logic Memory IC600LR648-K
GE Fanuc IC600RM715K Data Storage IC600RM715-K
GE FANUC CONTROL PANEL MONITOR/KEYBOARD/TAPE READER
GE FANUC A06B-0502-B005#7008 SERVO
GE Fanuc IC600BF948P Comm Control Rev P Used & Repaired
One-day shipping available
GE Fanuc IC697MEM732 MODULE
GE Fanuc A02B-0118-B006 POWERMATE
GE FANUC AC SERVO MOTOR A06B-0142-B075# 7008
Enlarge
GE FANUC AC SERVO MOTOR A06B-0142-B175
Enlarge
IC300OCS351H-07 GE FANUC OPERATOR CONTROL STATION – NIB
One-day shipping available
GE FANUC SERVO MOTOR A06B-0147-B176 #7075 22/2000
GE Fanuc IC660BBA105K Analog Current Source Module
GE Fanuc A06B-6066-H008 SERVO AMPLIFIER
GE FANUC A06B-0128-B175#7000 SERVO
Ge FANUC A05B-2452-C473 A20B-1007-0800 NEW
Ge FANUC A05B-2401-C412 A20B-1007-0490 NEW
NEW ? GE FANUC SERVO AMPLIFIER A06B 6058 H323 AMP CNC
Expedited shipping available
GE FANUC DRIVE 90-70 DLAN INTERFACE IC697BEM763F MODULE
GE FANUC QUICKPANEL QPICGAE0000-A 10.4″ QPICGAE-0000
GE Fanuc AC Servo Motor 10L A06B-0572-B061-R
GE FANUC A06B0315B002 #7000RS SERVO MOTOR
GE FANUC AC SERVO MOTOR 5S, A06B-0134-B504 #7076
GE FANUC QUICKPANEL QPICGDE0000-A 10.5″ INTERFACE PANEL
One-day shipping available
GE Fanuc IC610MSC105A Ser. One Plus Demonstration Unit
GE FANUC IC600BF944 NSPP IC600BF944
GE FANUC IC600CB526 USPP IC600CB526
GE Fanuc EBERLE BC42-P PV-MC2-701 IND TERM NEW
GE Fanuc α22/2000 A06B-0147-B075 #7008 SERVO MOTOR
GE FANUC HORNER HE693STP111D HE693STP111 NEW
GE Fanuc A06B-0115-B075 #0008 AC MOTOR NEW 5/4000
GE Fanuc IC695CPU310-EM RX3i 300 MHz CPU with 2 ports
GE FANUC IC752VCS006B IC752VCS TOUCH SCREEN VIEWSTATION
GE Fanuc A20B-1003-0180/01A A20B-1003-0180 ISB NEW
GE FANUC EE-3505-710-001 EE-3505-710 PURGE UNIT
GE Fanuc 531X300CCHACM1 531X300 CONTROL PCB
GE FANUC A20B-1000-0662/01A A20B-1000-0662 NEW
GE Fanuc FIVE IC655CPU500E IC655CPU500 IC655CPU500G B
GE Fanuc BOARD A20B-0006-0871/03A A20B-0006-0871
GE Fanuc IC655CPU500 IC655CPU500J
GE FANUC A20B-8001-0870/01A .A20B-8001-0870 NEW
GE Fanuc A06B-6079-H304 AC SERVO AMP
GE Fanuc IC800SLA0752A IC800SLA0752 AMPLIFIER
GE Fanuc IC697CPU771 J 9070 CPU 12MHz 2k IO IC697MEM715
GE FANUC BIU CARD 531X175SSBASM2 531X175SSBA 531X
GE FANUC PLC “REPAIR”, OBSOLETE IC693CPU364
Enlarge
GE FANUC A06B-6124-H103 HV SERVO DRIVE REMAN
One-day shipping available
GE FANUC A06B-6079-H206 SERVO DRIVE REMAN
One-day shipping available
GE FANUC A06B-6058-H222 SERVO DRIVE AMP AO6B
One-day shipping available
GE FANUC A06B-6096-H106 SERVO DRIVE REMAN
One-day shipping available
GE-Fanuc B-Series Amplifiers Pt # A106B-6093-H101
NEW GE FANUC A06B-6089-H105 A06B6089H105 Servo Amp
One-day shipping available
Ge FANUC IC693CPU364-CJ IC693CPU364
GE FANUC IC600LR616 NSPP IC600LR616
GE FANUC TGT-AI0V-8-0-BC USPP TGTAI0V80BC
GE Fanuc AC Servo Motor No. C955A4273
GE Fanuc AC Servo Motor Type A06B-0502-B067 Item #7076
GE FANUC A06B-6114-H205 Servo Amplifier A06B6114H205
One-day shipping available
GE FANUC IC600CP310 USPP IC600CP310
VMIC GE Fanuc VMIVME-3114 VMIVME3114 Analog I/O Board
One-day shipping available
