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PLC的输入输出电路与内部CPU是电隔离。其信息靠光耦器件或电磁器件传递。而且，CPU板还有抗电磁干扰的屏蔽措施。故可确保PLC程序的运行不受外界的电与磁干扰，能正常地工作。

PLC使用的元器件多为无触点的，而且为高度集成的，数量并不太多，也为其可靠工作提供了物质基础。

在机械结构设计与制造工艺上，为使PLC能安全可靠地工作，也采取了很多措施，可确保PLC耐振动、耐冲击。使用环境温度可高达摄氏50多度，有的PLC可高达80--90度。

有的PLC的模块可热备，一个主机工作，另一个主机也运转，但不参与控制，仅作备份。一旦工作主机出现故障，热备的可自动接替其工作。

还有更进一步冗余的，采用三取一的设计，CPU、I/O模块、电源模块都冗余或其中的部分冗余。三套同时工作，最终输出取决于三者中的多数决定的结果。这可使系统出故障的机率几乎为零，做到万无一失。当然，这样的系统成本是很高的，只用于特别重要的场合，如铁路车站的道叉控制系统。

NUMATICS 150 PSIG SOLENOID VALVE I24SS415K

NUMATICS 110/120V .37A 150 PSIG-AIR SOLENOID VALVE W/ BASE, 554SA43AK000030

PARKER * PARKER TRIPLE-LOK 90 ELBOW * UNKNOWN

NUMATICS PNEUMATIC SOLENOID VALVE I35RS115J00 0000 100881

HYDAC BETAFIT 1.06.39D03BN HYDRAULIC FILTER ELEMENT, NIB

NORGREN 175oF, 300PSIG, REGULATOR R24-401-RNXA

FESTO 32MM BORE 250MM STROKE PNEUMATIC CYLINDER, DNU-32-250-PPV-?A

YUKEN HYDRAULIC CYLINDER CJT70-FA32B50B-?PD-EK

SMC CYLINDER CDNAFN80N-100-D?-J59WLS

LUBRIQUIP PUMP ASSEMBLY AL-25, 521-000-020, L-90

FESTO 63MM BORE 50MM STROKE PNEUMATIC CYLINDER, DKE-63-50-PPV-A

MAC 24 VDC 6.0W SOLENOID VALVE 280B-506AAAA

SMC 50MM BORE 200MM STROKE PNEUMATIC CYLINDER CNAFN50N-200-D

YUKEN HYDRAULIC CYLINDER CJT70-FA32B600B?-BAD

BI * BI UNION FITTING * UNKNOWN

FESTO 40MM BORE 400MM STROKE PNEUMATIC CYLINDER, DNC-40-400-PPV-?A, NNB

PARKER P11771 -20-20 CRIMP FITTING SAE CODE 61 FLANGE HEAD 45 ELBOW

YUKEN CYLINDER CJT70-FA80B80H-?CBA-N 2012-411A

MAC PR65C-11BA 150 PSI PR65C SERIES PRESSURE REGULATOR, NNB

FESTO 145 PSI, SERIES ED08-14918 PNEUMATIC CYLINDER ADV-40-50-A

BOSCH RACINE 221887

SMC VXZ2240L SINGLE UNIT ZERO DIFFERENTIAL PILOT OPERATED DIAPHRAGM VALVE

ASHCROFT DURAGAUGE BRONZE TUBE 30-0VACUUM-IN/H?G. GAUGE 45-1379 103764

PARKER 11971-32-32 SAE CODE 61 FLANGE HEAD 90 ELBOW

MAC 6311A-512-PM-11?1DA 110/120 VOLTS 50/60 SOLENOID VALVE

MLOK CYLINDER RCN-138600CA

NUMATICS 24VDC, 4.0W, 150PSIG-AIR, PNEUMATIC VALVE I34BA400MP00061

SMC PNEUMATIC SERVICE KIT NIB CK95-80 105415

PARKER 150PSI 1034kPa PNEUMATIC SOLENOID VALVE B511ABB53C

NUMATICS 150PSIG PNEUMATIC SOLENOID VALVE NNB I35SA43BK000030 100509

NUMATICS PNEUMATIC PRESSURE REGULATING VALVE 031RD700O000000 NIB

MLOK CYLINDER RCN-138600-800-?05

NUMATICS 110/120V .06A 60HZ 150 PSIG SOLENOID VALVE, 031SA415O011Z

NUMATICS 120 V, 50-60HZ, .08A SOLENOID VALVE 1525A425K

NUMATICS PNEUMATIC AIR FILTER REGULATOR F22B-01AM 99883

NUMATICS MAX OPERATING PRESSURE 150 PSIG SOLENOID VALVE 135BB515MP00061

FESTO CPV18-VI U502 DISTRIBUTION MANIFOLD ASSEMBLY 185 886 T402

GRACO 250PSI 17.5BAR AIR LINE REGULATOR A01 A 214848

FESTO 63MM BORE 920MM STROKE PNEUMATIC CYLINDER, DKE-63-920-PPV-?A

ADVANCE AUTOMATION AAC SK-1176 PNEUMATIC CYLINDER SERIES I, NNB

TAIYO PNEUMATIC CYLINDER 40X30 NPB031A000-0

FESTO ALUMINUM CYLINDER 10543 DKE-100-60-PPV-?P

ELECTRON BEAM ENGINEERING QCC HD 504 WELDING CABLE, LOT OF TWO, NIB

FESTO 145 PSI 100MM BORE 160MM STROKE PNEUMATIC CYLINDER, DNC-100-160-PPV?, NNB

FESTO 32mm BORE 150mm STROKE PNEUMATIC CYLINDER DNC-32-150-PPV-?A NNB

FESTO 63MM BORE 125MM STROKE PNEUMATIC CYLINDER, DNU-63-125PPV-A?, NNB

NUMATICS 120V, 0.11A, 150 PSIG SOLENOID VALVE I52SA400K046T

MAC VAC/25-150PSI, 24VDC, 2.5W, PNEUMATIC SOLENOID VALVE 6523B-000-PM-59?2DA

BIMBA BRACKET CYLINDER D-167

PARKER 035341300B FILTER, NIB

SMC 1.0MPA PNEUMATIC CYLINDER DLMBN20-25C-G59?LS

PARKER 5000PSI DIRECTIONAL CONTROL VALVE 44036-2026

PARKER 250PSI ROTARY PNEUMATIC ACTUATOR PTR252-0983F-AX?22-C21

SMC 0.05-0.85MPA AIR REGULATOR AR4000-04BG

KYOHO MACHINE HCI-XD CYLINDER 40MM BORE 435MM STROKE 40X435-FA 74H40956

STAFFA FIXED DISPLACEMENT HYDRAULIC MOTOR HM/HDB2005/11

FESTO CPV14-VI TD02 DISTRIBUTION MANIFOLD ASSEM W/ SILENCER AND ELBOW FITTINGS

MAC 110/120VOLTS 150PSI SOLENOID VALVE 6311D-211-PM-11?1DA

FESTO 145 PSI 100MM BORE 30MM STROKE PNEUMATIC CYLINDER, ADVU-100-30-A-P?-A, NNB

YUKEN HYDRAULIC CYLINDER CJT 70 FA32B 20N-DND EK 11A

BELLOWS 110/120V 50/60HZ PNEUMATIC SOLENOID PILOT VALVE, K175-9035

FESTO 145 PSI 50MM BORE 90MM STROKE PNEUMATIC CYLINDER, DNG-50-90-PPV-A?, NNB

FESTO CPV14-VI T402 DISTRIBUTION MANIFOLD ASSEM W/ SILENCER AND ELBOW FITTINGS

FESTO 145 PSI 50MM BORE 153MM STROKE PNEUMATIC CYLINDER, DNGU-50-153-PPV?-A, NNB

YUKEN HYDRAULIC CYLINDER CJT70-FA32B25N-?AND-EK 20A

MAC 110/120V 50/60HZ 150 PSI SOLENOID VALVE, 58D-43-116AA

CKD PNEUMATIC CYLINDER SSD-KL-50-80

PARKER HHB4087501 ALR 35-150 PSIG CONTROL VALVE, NNB

NUMATICS PNEUMATIC FILTER MODEL F30B-04C NIB

FESTO FLAT CYLINDER DZH-50-300-PPV-?A

BIMBA AIR CYLINDER BFT-093-D

PARKER 11771-32-32 CRIMP FITTING SAE CODE 61 FLANGE HEAD -45 ELBOW

KYOHO MACHINE HCI-XD CYLINDER 50MM BORE 115MM STROKE 50X115-CB 66H50888

PARKER 2.00 " BORE 8.000" STROKE HYDRAULIC CYLINDER JMAU14A

LENZ * LENZ NUT FITTING * UNKNOWN

NUMATICS 150PSIG, 110-120V, 50/60Hz, .15A, SOLENOID VALVE 081SS400K000030

FAIRCHILD TD C17800-406 PNEUMATIC TRANSDUCER, NNB

NUMATICS L23PM452O000000 PILOT VALVE, NNB

MAC PR92C-KECA 120 PSI PRESSURE REGULATOR, NIB

SMC PNEUMATIC CYLINDER 25MM BORE 35MM STROKE CQSB25-35D

NUMATICS 24VDC 4.0W 150 PSIG-AIR PNEUMATIC SOLENOID VALVE, I24BA415MP

NUMATICS 0-232 PSIG PNEUMATIC SOLENOID VALVE W/ BASE, I34JJ641O000000

NUMATICS 110/120V 50/60HZ 150 PSIG-AIR SOLENOID VALVE W/ BASE, I35BA415KKP0003?0

MAC PR92C-KECA 120 PSI PRESSURE REGULATOR WITH GAUGES, NIB

VERSA 120V 100PSI SOLENOID VALVE ESM 8012 44 Z CLL36

KYOHO HCI-XC HYDRAULIC CYLINDER 40X100-FB / 56H40995

NUMATICS 100-115V/50Hz, 110-120V/60Hz, .06A SOLENOID COIL 237-1045B

MAC 24 VDC 2.5W 150 PSI SOLENOID VALVE W/ BASE, 6313D-611-PM-59?1DA

BELLOWS INTERNATIONAL SOLENOID VALVE W / PILOT VALVE L615-49-102 / K065-9035

ASHCROFT DURAGAUGE 30-IN./HG.VAC-3?0PSI PRESSURE GAUGE 102553

MILWAUKEE CYLINDER 4.00 BORE 6.00 STROKE 1000 PSI HYDRAULIC CYLINDER LH61

CMT DOUBLE ACTING IMPACT MARKER W/ PROXIMITY SENSOR 288-0B-25-PML-W?2817

SMC 1.0MPS PNEUMATIC PRESSURE REGULATOR FILTER AF4000-04D

HYTORK 4581 ACTUATOR EIA-XL4581-A80-?B00

KYOHO HCI-XD CYLINDER 40X460-FA

NUMATICS ELEMENT FILTER EKF608G NIB

AMETEK PNEUMATIC HAND PUMP T-970

NUMATICS 24VDC 4.0W 150 PSIG-AIR SOLENOID VALVE, I23BB500MP00061

NUMATICS 24VDC 4.0W 150 PSIG-AIR PNEUMATIC SOLENOID VALVE, I34BB500MP00061

NUMATICS 110/120V .15A 50/60HZ 150 PSIG-AIR SOLENOID VALVE, 11DSA400C011J

NUMATICS 24VDC 4.0W 150 PSIG-AIR PNEUMATIC SOLENOID VALVE, I34BB400MP14D61

NUMATICS 24VDC 4.0W 150 PSIG-AIR SOLENOID VALVE W/ ONE COIL, I24BB415MP00061

FESTO 32mm BORE 100mm STROKE GUIDED CYLINDER DFM-32-100-P-A-?GF

SMC 20MM BORE 75MM STROKE 0.15-0.7MPA EXTENSION END AIR SLIDE TABLE, MXQ20L-75BS

NUMATICS 120V .12A 50/60HZ 150 PSIG-AIR SOLENOID VALVE W/ BASE, 081SS400K

FESTO 145PSI PNEUMATIC CYLINDER DNC-40-60-PVV-A

SMC PNEUMATIC CYLINDER 25MM BORE 150MM STROKE CDQSB25-150DC

YUKEN HYDRAULIC CYLINDER CJT70-LB40B85B-?BAD

YUKEN HYDRAULIC CYLINDER CJT70-FA40B160B?-CAA

KYOHO HCI-XD HYDRAULIC CYLINDER 40X27-FA / FXH40415

SMC CYLINDER CDNAGN40N-100-D W/CNA40ND-UA