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(1)來自空間的輻射干擾
空間的輻射電磁場（EMI）主要是由電力網(wǎng)絡、電氣設備的暫態(tài)過程、雷電、無線電廣播、電視、雷達、高頻感應加熱設備等產(chǎn)生的，通常稱為輻射干擾，其分布極為復雜。若PLC系統(tǒng)置于所射頻場內，就回收到輻射干擾，其影響主要通過兩條路徑；一是直接對PLC內部的輻射，由電路感應產(chǎn)生干擾；而是對PLC通信內網(wǎng)絡的輻射，由通信線路的感應引入干擾。輻射干擾與現(xiàn)場設備布置及設備所產(chǎn)生的電磁場大小，特別是頻率有關，一般通過設置屏蔽電纜和PLC局部屏蔽及高壓泄放元件進行保護。
(2)來自系統(tǒng)外引線的干擾
主要通過電源和信號線引入，通常稱為傳導干擾。這種干擾在我國工業(yè)現(xiàn)場較嚴重。
(3)來自電源的干擾
實踐證明，因電源引入的干擾造成PLC控制系統(tǒng)故障的情況很多，筆者在某工程調試中遇到過，后更換隔離性能更高的PLC電源，問題才得到解決。
FENNER 3/4 / 5/8 IN. SHAFT HYDRAULIC PUMP 2S30AAC
CRANE DEMING SIZE 6X4X12 CENTRIFUGAL PUMP 4066 4266
REXROTH HYDRAULIC GEAR PUMP S16S4AH16R
BELL & GOSSETT 3" X 4" CENTRIFUGAL PUMP SIZE 185014
Newly listedBELL & GOSSETT 3" X 4" CENTRIFUGAL PUMP SIZE 185016
SIEMENS SIMATIC S5 6ES5 701-1LA12
INGERSOLL-RAND Y325-214 1/8" X 1-1/4" O.D. REPLACEMENT O-RING, NEW IN BAG SEALED
GOULD 5-VANE 25" PUMP IMPELLER A744 68136 03 CF8M
LUBRIQUIP 1/4" & 3/8" NPT, REMOTE PUMP MANIFOLD KIT 521-001-780 *NEW*
HPI 1/4"NPT 2 PORTS 6000RPM 150 BAR PUMP C5080409 *NEW*
BELL & GOSSETT 6" X 8" CENTRIFUGAL PUMP, NO LABEL
PARKER 3/4" & 3/8" THREADS GEAR PUMP HD25AA2A17B
GOULDS ITT G&L SERIES STAINLESS STEEL VERTICAL MULTI-STAGE PUMP 1SVB1H5J6 *MTR*
WILDEN 2" DOUBLE DIAPHRAGM PUMP M8
DETROIT DIESEL 1/4" NPT FULL PUMP R5199560
FLUID POWER 1/2"NPT, GLOBE VANE AIR MOTOR VA4JXXX10
BELL & GOSSETT 3" X 4" CENTRIFUGAL PUMP SIZE 185014, L48
HYVAIR PISTON PUMP PCP4-3K-2AK-3
AURORA PUMPS 1&3/4 X 2&1/2 CENTRIFUGAL PUMP
VICKERS CHECK VALVE DT8P1-05-3C-11 NEW
VICKERS 3/4" NPT OUTLET 2-BOLT FLANGE HYDRAULIC VANE PUMP, V20-1R6P-22D11R
GOULDS PUMPS, INC. 3196 PUMP POWER END, 2 X 3 - 13
KLINGER 280°C SIZE 3/8" MULTISERVICE PACKING, STYLE 49 *NEW*
GRACO LEATHER THROAT PACKING REPAIR KIT FOR HIGH-FLOW PUMPS 218-734 *NEW SEALED*
GORMAN RUPP ROTARY GEAR PUMP GHS1DC3-B0005
AHLSTROM 121FT 918GPM 1800RPM 4" X 6" CENTRIFUGAL PUMP TYPE THP-10
GOULD 4X6-13 CENTRIFUGAL PUMP MODEL 3196
Newly listedAHLSTROM 110FT 551GPM 1780RPM 4" X 6" CENTRIFUGAL PUMP TYPE THN-10
NORDSON TRANSFER PUMP 281265 *NEW*
CENTRO-MATIC 1000 PSIG 20:1 RATIO 1/4" NPTF AIR-OPERATED OIL PUMP, 83667 SER. F
TEEL DRUM PUMP KIT, 1N427 *NEW NO BOX*
BINGHAM 1-STAGE 3560RPM 1220GPM 550 HEAD CENTRIFUGAL PUMP 4X6X14B ES CAP
VERSA ELIMA-MATIC PUMP 1/2" AIR POWERED DIAPHRAM LIQUID PUMP
GOULDS 230FT 275GPM 3600RPM 3X4-10 DI MTX PUMP 3196 W/ 10HP TOSHIBA MOTOR
VERSA-MATIC 3" PUMP DIAPHRAGM PUMP E3CA6X660
PARKER THREADS GEAR PUMP HD25AA2A17D
WARREN RUPP 100PSI 7-BAR SANDPIPER DIAPHRAGM PUMP S15B1ABWANS000
CRANE 3/4"NPT 150 S 300CWP BRONZE BALL VALVE 7 TF
LMI MILTON ROY 1/8"NPT PUMP REPLACEMENT DIAPHRAGM MBM 99.9-1
GUSHER 150GPM CENTRIFUGAL PUMP CL2X3-13SEL-CDM?-AP
JOHN BARNES APPROX. 3/4" SHAFT DIA. HYDRAULIC PUMP 735591-R *NEW*
3-VANE PUMP IMPELLER THL10A260P / T324
NACHI VARIABLE VANE PUMP VDR-1A-1A3-Q11-?6124A *NEW*
Newly listedBELL & GOSSETT CENTRIFUGAL PUMP, 3" X 2"
GORMAN-RUPP 10 SERIES SELF-PRIMING CENTRIFUGAL PUMP 11 1/2A52-E2 3P/S1 W/ MOTOR
SANDPIPER 100PSI/7BAR AIR-OPERATED DOUBLE DIAPHRAM PUMP PB 1/4 TT3PP
GLOBE VS4C VANE AIR MOTOR, NEW
SANDPIPER 100PSI/7BAR AIR-OPERATED DOUBLE DIAPHRAM PUMP PB 1/4 TT3PP
GLOBE VS4C VANE AIR MOTOR, NEW
LINCOLN MODEL 989 HIGH PRESSURE PORTABLE HEAVY DUTY GREASE PUMP, NEW
EATON /VICKERS HYDRAULIC PUMP V10 1S7S 11C20 100858
GUSHER 150GPM CENTRIFUGAL PUMP CL2X3-13SEL-CDM?-AP
AHLSTROM 36FT 1532GRPM 1170RPM 6" X 8" STAINLESS STEEL CENTRIFUGAL PUMP TLN-15
TEEL PISTON DRUM PUMP KIT, 1N427 *NEW*
WARREN PUMPS, INC. 22-1/2" IMP. 8000GPM 1175RPM SPLIT CASE PUMP SIZE 14-DLB-20H
ROTO-JET SIZE S-375 PUMP ROHA III 3X2 DI / 1.7805 GEAR REDUCER W/ 250HP MOTOR, B
GOULDS LF3196 30GPM 3600RPM 316SS CENTRIFUGAL PUMP SIZE 1 X 1.50 - 8
REXROTH HYDRAULIC PUMP 1PV2 V3-43/25 RW12MC63A1/5
VICKERS DISPLACEMENT PUMP PVQ10 A2R SE1S 20 99387
NASH ELMO 20HP VACUUM PUMP TYPE SC4 / 7
BSM PUMP CO 1/2" HYDRAULIC PUMP BS NO 2
NIPPON 1-1/4"NPT, 52CM3/REV, 3.0MPA MAX, TROCHOID PUMP TOP-N340H *NEW*
JOHN CRANE INTERNATIONAL 1-3/4" MECHANICAL CARTRIDGE SEAL A27346
UNKNOWN MFG * STEEL 3/4" SEAL-TIGHT 90 DEGREE ELBOW * UNKNOWN
CRANE DEMING SIZE 6X4X12 CENTRIFUGAL PUMP 4066 00001221
VICKERS EATON VARIABLE DISPLACEMENT PISTON PUMP PVH57CRSF1S10C2?5V31
INGERSOLL-RAND SERVICE REPAIR KIT, ARO 637291-P43 *NEW*
VICKERS HYDRAULIC PUMP V10 1S7S 11A20 100628
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