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來自接地系統混亂時的干擾：接地是提高電子設備電磁兼容性(EMC)的有效手段之一。正確的接地，既能抑制電磁干擾的影響，又能抑制設備向外發出干擾；而錯誤的接地，反而會引入嚴重的干擾信號，使PLC系統將無法正常工作。

來自PLC系統內部的干擾：主要由系統內部元器件及電路間的相互電磁輻射產生，如邏輯電路

邏輯電路是包含邏輯關系的數字電路， 以二進制為原理、實現數字離散信號的傳遞，邏輯運算和操作的電路。基本的邏輯電路是常見的門電路，而簡單的門電路為與電路、或電路和非電路。相互輻射及其對模擬電路的影響，模擬地與邏輯地的相互影響及元器件間的相互不匹配使用等。

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ALLEN BRADLEY SURGE SUPPRESSOR LOT OF 5 700-HSMD SERIES A
 
OKAYA SURGE PROTECTOR 781BXZ-2A
 
ALLEN BRADLEY 12-250VDC SURGE SUPPRESSOR SER.A LOT OF 2 100-FSD250 99624
 
ALLEN BRADLEY 110-280VAC SURGE SUPPRESSOR SER.A LOT OF 5 100-FSC280 99616
 
RELIANCE ELECTRIC 5A 240VDC SURGE SUPPRESSOR NIB 600686-25RR 48F
 
SOLA 120V 400VPK 0-135VRMS SURGE SUPRESSOR STV25K-10SDIN
 
COOPER VARISTAR SURGE ARRESTER 20853025640 08 UTO1008085BC11
 
ALLEN BRADLEY SURGE SUPPRESSOR 136VAC 180VDC 100-FSV136 SER A

GENERAL ELECTRIC 3POLE MW60 MOD 2 SWITCH THMC32
 
HONEYWELL LIMIT SWITCH 250V NIB 914CE1-3
 
ALLEN BRADLEY GUARDMASTER CADET SAFETY SWITCH IEC 947-5-1
 
HONEYWELL MICRO LIMIT SWITCH 15A 125/250/480VAC BZE6-2RQ
 
TURCK 10-65VDC 200MA 20MM PROXIMITY LIMIT SWITCH NI20-CK40-VP4X2?-H1141
 
GENERAL ELECTRIC 3 POLE LIMIT SWITCH THMC33
 
HONEYWELL 600VAC 10A MICRO SWITCH LSYAB1A
 
UNIMAX LIMIT SWITCH NNB 2HB-5
 
TELEMACANIQUE LIMIT SWITCH OPERATING HEAD NIB ZC2JEO9H5
 
CUTLER HAMMER GRAVITY RETURN LIMIT SWITCH E50DG1 SER A1
 
MICRO SWITCH 600VAC 10A LIMIT SWITCH LSV6B 102687
 
ALLEN BRADLEY SAFETY LIMIT SWITCH 230V 3A IEC 947-5-1 CM BS5304 IP66
 
ALLEN BRADLEY LIMIT SWITCH 802M-AZJ5LF SER. A
 
GE 10A 600VAC LIMIT SWITCH CR115G 219 102823
 
ALLEN BRADLEY LIMIT SWITCH OPERATOR HEAD 40146-013-60
 
BALLUFF SAFETY POSITION LIMIT SWITCH NIB BNS813-X606B06L?12-61A2206 100597
 
BALLUFF LIMIT SWITCH NIB BNS813-B02-L12-?61-A2202D0 100636
 
BALLUFF SAFETY LIMIT SWITCH BNS-813-B02-L12?- 61-A-22-02-D016 100532
 
CUTLER HAMMER SWITCH 10316H89A
 
SQUARE D LIMIT SWITCH 9007C54FP10Y190?21
 
TELEMECANIQUE 110/240V LIMIT SWITCH XCS-L
 
BALLUFF LIMIT SWITCH BNS 813-802 / L12-61-A-22 100510
 
SQUARE D A600 Q600 LIMIT SWITCH 8905
 
TREGASKISS SPINDLE LIMIT SWITCH NIB TT-2322
 
CUTLER HAMMER 600VAC PILOT DUTY LIMIT SWITCH 10316H1219C 102097
 
TELEMECANIQUE SAFETY LIMIT INTERLOCK SWITCH NIB XCS B503 / 018501 101883
 
TELEMECANIQUE SAFETY LIMIT SWITCH NIB XCS B503 / 018501 101854
 
SQUARE D LIMIT SWITCH SER A 9007C52D


TRANSFORMER TR-13195 417153-2S
 
RELIANCE ELECTRIC 1-POLE 110A SIZE 3 CONTACT KIT, K-258 *NEW*
 
HOFFMAN PANELS FOR JUNCTION BOXES, A12P10 *NEW LOT OF 2*
 
BRAD HARRISON 4-POLE 18/4AWG 10M MICRO-CHANGE CORDSET, 884032K03M100 *NEW*
 
POTTER & BRUMFIELD KUP-5D55-12 ENCLOSED RELAY, NIB
 
MONITOR TECHNOLOGIES KAX ROTARY PADDLE BIN LEVEL INDICATOR 1-8401-1-805
 
TURCK CORDSET, VB2-FSM 4.4/2WKC 4T-0.3/0.3/S622 *NEW*
 
BIELOMATIK WWAKRT4P2-3, 5-SSM3/S74 NIB
 
TELEMECANIQUE LIMIT SWITCH XCS IEC 947-5-1
 
FESTO 24VDC 4A 5-PIN ELECTRICAL ADAPTER, FBA-2-M12-5POL-?RK NEW SEALED
 
REES INC. 2-1/4" HEAVY DUTY MUSHROOM PLUNGER SWITCH, 00662-003 *NEW*
 
LUBE DEVICES APPROX 3/4" NPT OIL GAUGE, LOT OF 3, NEW IN BAG
 
HOFFMAN 12" X 12" X 9.09" CONSOLET ENCLOSURE, C-12C12 *NEW*
 
BLACK BOX 10FT CAT5E PATCH CABLE, EVNSL94-0010 *NEW*
 
APOLLO CONBRACO 1/2" 3 PIECE BALL VALVE NEW
 
GREENLEE CONDUIT-3/4", HOLE SIZE: 1.12" KNOCKOUT DIE 9992496.0 *NEW, SEALED*
 
ENDRESS + HAUSER HTC10A-AD1R1 SEPARATGEHAUSE NIB
 
MARSH / BELLOFRAM 1/4" NPT, 2.5" STD STEEL SERVICE GAUGE J4654 *NEW*
 
BRIDGEPORT 3/4" NPT EMT CONNECTORS, 231-DC2 *NEW LOT OF 25*
 
MARSH 1/2" NPT 0-100 PSI PRESSUE GAUGE 34693-3 ISS.C *NEW*
 
ILME 1/2" NPT CONNECTOR HOODS, 23468, NEW LOT OF 3
 
FALK STEELFLEX 1030T10 COVER-GRID ASSEMBLY, 0775802 *NEW*
 
ACME TRANSFORMER * 1 PHASE 2.0 KVA * T-2-5312-S
 
AMETEK 2", 0-100 PSI, 1/8" NPT PRESSURE GAUGE SPEC 164419 *NEW*
 
CROUZET 81-513-060 SUB-BASE FOR MINIATURE CONTROL VALVES, NEW IN BAG
 
APPLETON BBU75H 3/4" PLASTIC BUSHINGS, LOT OF 27, NEW IN BAG
 
SIEMENS SIMATIC S7 6ES7 131-4BB00-0AB0 LOT OF 4
 
EIL 120V, 2 SET POINTS METER RELAY MR4-24 *NEW*
 
THOMAS & BETTS .250-.375 CABLE 3/4" HUB CONDUIT FITTINGS, 2271 *NEW LOT OF 8*
 
COOPER CROUSE-HINDS 3/4" NPT SINGLE GANG CAST DEVICE BOX FSCA2 LOT OF 2
 
CROUSE-HINDS CONDUIT GANG BOX 1/2 FSC 12 3/4 FSC 22 NNB
 
DRC METRIC TRANSDUCER ENCODER, SST-10-M2-07A-S?607