可编程控制器由于抗干扰能力强，可靠性高，编程简单，性能价格比高，在工业控制领域得到越来越广泛应用。

   中央控制单元和下位机PLC之间采用串行通讯方式进行数据交换，通常距离在1000m以内选用485双绞线通讯方式，较常距离可选用光纤通讯，更长距离也可选用无线通讯方式。下位机选用PLC控制，根据控制对象的多少，控制对象的范围，可选用一台或多台PLC进行控制，PLC之间数据交换是利用内部链接寄存器，实现数据交换和共享。由于PLC对现场进实时监控具有很高的可靠性，且编程简单、灵活，因此越来越受到人们重视。

   1、控制系统可靠性降低的主要原因

   虽然工业控制机和可编程控制器本身都具有很高的可靠性，但如果输入给PLC的开关量信号出现错误，模拟量信号出现较大偏差，PLC输出口控制的执行机构没有按要求动作，这些都可能使控制过程出错，造成无法挽回的经济损失。

   影响现场输入给PLC信号出错的主要原因有：

   1)造成传输信号线短路或断路（由于机械拉扯，线路自身老化，特别是鼠害），当传输信号线出故障时，现场信号无法传送给PLC，造成控制出错；

   2)机械触点抖动，现场触点虽然只闭合一次，PLC却认为闭合了多次，虽然硬件加了滤波电路，软件增加微分指令，但由于PLC扫描周期太短，仍可能在计数、累加、移位等指令中出错，出现错误控制结果；

   3)现场变送器，机械开关自身出故障，如触点接触不良，变送器反映现场非电量偏差较大或不能正常工作等，这些故障同样会使控制系统不能正常工作。

   影响执行机构出错的主要原因有：

   1)控制负载的接触不能可靠动作，虽然PLC发出了动作指令，但执行机构并没按要求动作；

   2)控制变频器起动，由于变频器自身故障，变频器所带电机并没按要求工作；

   3)各种电动阀、电磁阀该开的没能打开，该关的没能关到位，由于执行机构没能按PLC的控制要求动作，使系统无法正常工作，降低了系统可靠性。要提高整个控制系统的可靠性，必须提高输入信号的可靠性和执行机构动作的准确性，否则PLC应能及时发现问题，用声光等报警办法提示给操作人员，尽快排除故障，让系统安全、可靠、正确地工作。

   2、设计完善的故障报警系统

   在自动控制系统的设计中我们设计了3级故障显示报警系统，1级设置在控制现场各控制柜面板，用指示灯指示设备正常运行和故障情况，当设备正常运行时对应指示灯亮，当该设备运行有故障时指示灯以1Hz的频率闪烁。为防止指示灯灯泡损坏不能正确反映设备工作情况，专门设置了故障复位/灯测试按钮，系统运行任何时间持续按该按钮3s，所有指示灯应全部点亮，如果这时有指示等不亮说明该指示灯已坏，应立即更换，改按钮复位后指示灯仍按原工作状态显示设备工作状态。2级故障显示设置在中心控制室大屏幕监视器上，当设备出现故障时，有文字显示故障类型，工艺流程图上对应的设备闪烁，历史事件表中将记录该故障。3级故障显示设置在中心控制室信号箱内，当设备出现故障时，信号箱将用声、光报警方式提示工作人员，及时处理故障。在处理故障时，又将故障进行分类，有些故障是要求系统停止运行的，但有些故障对系统工作影响不大，系统可带故障运行，故障可在运行中排除，这样就大大减少整个系统停止运行时间，提高系统可靠性运行水平

PLC 控制系统的抗干扰能力是关系到整个控制系统安全运行的关键因素之一，而接地系统是PLC安装和应用过程中的重要环节。针对PLC控制系统中存在的干扰问题，重点探讨了系统接地类型、方式及接地装置。实际结果表明，采取良好的接地措施，对提高PLC控制系统的抗干扰能力。

引言    

   随着国民经济的快速增长，国家智能电网计划建设更多高参数、大容量的燃煤火电机组，以满足不断增长的电能需求。高参数、大容量燃煤火电机组的辅助PLC控制系统的控制结构和控制范围发生了巨大的变化，因此，对控制系统的可靠性要求更为严格。

   PLC系统的抗干扰能力已越来越受到人们的重视。合理、可靠的系统接地是提高控制系统抗干扰能力的重要保证。为了保证PLC控制系统的监测控制精度和安全、可靠运行，必须从设计、设备的选型和安装、调试、生产维护各个环节对PLC控制系统的接地进行控制。本文就多个PLC控制系统现场实际应用的情况，探讨了如何通过完善PLC控制系统的接地来提高系统的抗干扰能力，从而实现系统的安全运行。

一、干扰的产生

   PLC控制系统应用现场的干扰源种类繁多，尤其是大型电厂更为复杂。干扰的来源主要包括以下几个部分。

   ①PLC控制系统内部

   PLC 控制系统内部干扰源主要有元器件的固有噪声、电源系统等。 

   ②PLC控制系统外部 

   PLC控制系统外部干扰源主要有闪电、雷击、电气设备的电磁场、电火花等。 

   ③PLC控制系统和周围其他系统的电位差等

   在PLC控制系统和周围其他系统的电位差等干扰中，有些干扰源有规律可循，可以通过一定的手段检测并加以控制；有些干扰源则随机出现，难以捕捉。但各种干扰源都是通过一定的途径对控制系统产生影响的，这些干扰途径主要是以“路”或“场”的形式出现。 

   1.1 “路”的干扰

   “路”的干扰是指干扰通过电路（主要是控制系统的过程通道或电源系统）进入PLC控制系统。A/D、D/A转换设备和各种输入装置都有可能成为各种干扰的通路。另外，过程通道和PC计算机之间的公共地线也会成为干扰通路。

   “路”的干扰分为串模干扰和共模干扰。

   串模干扰是指干扰信号叠加在输入信号上的一种干扰方式。这种干扰信号的特点是它与输入信号串联，存在于同一个回路中，并且全部施加在接收被测信号设备的输入端。干扰信号可能是信号源内部产生的，如图1(a）所示；也可能是由导线感应进来的，

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Brook Hansen gfnb 4b5.6-wu-da90lk-h Gear Motor-un -

Siemens Line Filter Network Filter 6sl3000-0be23-6aa0 36 KW E-Stand: B-/In B...

SITEMA Fall Protection KRP 25/KR 02511 10kn 4bar-UN/BOXED -

Janitza UMG 505 umg505 52.10.004 Universal Meter-Distressed

North Hydraulic MK pressure limiting valve RM 233ew/2xdw-2k9-2x1k9-3x - UN -

Siemens Simatic s7 6es7407-0ka00-0aa0 6es7 407-0ka00-0aa0 E-Stand: 02 Distressed

Siemens Simatic s5 6es5 095-8mc01 6es5095-8mc01 E-Stand: 03 Distressed

Belimo ef24gx-sr efa-kc0 200 h06 30nm 24vac/dc ACTUATOR FLAP ACTUATOR-

Bauer Gear Motor bs04-74v/d04la4-s/e003b4/am 0,06 KW-UN -

Festo dnu-63-400-ppv-a s3 158847 10bar/145psi Pneumatic Cylinder-Distressed

Steel Exicom 9764 Power Device Type: ent-dc-1.0-19k PTV-no. ex-92.c.2046x - Dist...

Ametek Solartron Metrology Orbit dp2s 971100-3 - UN/BOXED -

Merlin Gerin Schneider Compact ns160l 1250a tm160d/160a Power Switch-Un

Danaher Motion servomotor dbl2h00060-br2-110-s40 Distressed

Siemens g32002-f-g800-z s5led v2.2 200730 Rev. 00-Distressed

AEG thyrovar Type iteal 220-45 re 763-612-300.00 Distressed

Siemens Simatic s5 6es5454-4ua11 6es5 454-4ua11 E: 1-SEALED -

Rexroth Hydraulic Cylinder cdm1-mp5/40/28/140a10/B 1 cgdmww-UN -

KEM Küppers ZHM 01 St. D.V Gear Flow Meter 0,005-1l/min - UN -

Siemens OP 15-c2 6av3515-1ma2 6av3 515-1ma22 E-Stand: 06 WITHOUT BATTERY COVER

Festo cpv10-ge-fb-8 18252 + 5x Solenoid Valves-Distressed

Siemens 6se7021-2ep87-0fb1 E: a 12a 380-480v 3-line EMC filter-Un/Boxed -

Siemens Piezo Graph 2 7nd2482-5da00-0xb0 Multireg 32 Multi Function Recorder-Use...

Aerotechnik Victory presence 233-1 incl. PIC 080 Flow Regulator PIC-UN -

Norgren sa/8100/w1/50 Pneumatic Cylinder-Un -

Texas Instruments 505-4416 5054416 220vac input SPS Card-Distressed

Witten Stone Alpha SP 060s-mf1-4 - oc1-2s sp060s-mf1-4-oc1-2s I = 4-UN -

Bird gear MPV 00 I 10.0 = 482796 / 290633-un-

Kollmorgen dbl2m00080-b3m-000-s40 ID: 104852 Servo Motor-Distressed

ICO System 16.000.050.130 Heater Hose 5,00m dn13-Distressed

Siemens DEMATIC p-pif95-x75 32.1699.576-00 02801734 Distressed

Jetter NANO-B NB-CPU-Distressed

Indramat MT-CNC mtcb 03-00 Rack-Distressed

Danfoss Frequency Inverter fcd315pt4p66exr1dcf10t22c0 2,6kva - UN -

Siemens lae10-110v LAE 10-110v Series 02 110v 5va flammw?chter-UN/BOXED -

Danfoss VLT 5003 Inverter vlt5003pt5b20sbr3d0f00a00-Distressed

Siemens 3nj6203-3ab00-1db1 fuse load isolators Bar-UN-BNIB

Haas 18-13-11-00/02 v1.4 PC Board LRS output control-un -

Sato m8480s-dsw Rev. 1.1 Thermal Print Head Control Board-Un -

IPR ULS 200 uls200 uls-200 Anti-Collision-UN -

Siemens j31070-a5711-f002-b1-85 mbbxl 400v 100kw a5e00295571 E: b2 Distressed

INA rwu45-e-hl g2 v3 017-880-882/042 Roller Guide Car-Un/Boxed -

Witten Stone Alpha Planetary Gear TP 010-mf2-91-031-000 - Distressed

Siemens Simatic s7 6es7 314-1ag13-0ab0 6es7314-1ag13-0ab0 E: 03 + M-Card-Distres...

Rikmeier Hydraulic Pump R 25/10fl-z-db 0,25 KW 5 Bar-Distressed

Siemens 1la7130-4aa66 1la7 130-4aa66 Electric Motor 5,5kw - UN/BOXED -

Kollmorgen PSR Power supply

Schneider Automation TSX a250 Bik 116 SFB-Master 6365-042244609 - Distressed

Endress + Hauser MYCOM-O com121-3a00 Transducer-Distressed

Siemens Sinumerik 6fx1122-8bd01 6fx1 122-8bd01 E-Stand: a-Distressed

Siemens Micromaster Simovert 6se3012-0ba00 6se 3012-0ba00 E: J-Distressed

Ophir l150w-a - .1-tr 173602a Trumpf 1230877 Thermopile Laser Power Meter-/B...

Siemens 3np5360-0ea86 3np5 360-0ea86 e:02 load isolators-UN/BOXED -

Which Uni-Line has-111dg 100060267.70 Sync Control Relay-Un -

Lenze ETML 152x2sfa530xx1b13 13268107 230v 1,50kw 2 HP Freq. Converter-UN/BO...

Ziehl Abegg fan, fan rh31m-2ek.3f.2k 0,63kw 2470/min 230v-Distressed

Siemens Simatic s7 6es7 414-2xg03-0ab0 6es7414-2xg03-0ab0 E-Stand: 04 Distressed

Ziehl Abegg fan, fan rh31m-2dk.3f.2r 0,62kw 2690/min 230v-Distressed

Allen-Bradley 22a-b4p5n104 Series a frequency inverter 0,75kw - UN/BOXED -

KEBA Micron ht4/Neutral/16846 Hand Terminal-Distressed

North Drive 500e SK 500e-750-323-a 0,75kw Inverter-UN/BOXED -

Kollmorgen dbl2h00040-b3m-00k-s40 Servo-Motor-Distressed

Ziehl Abegg fan, fan rh25m-2dk.3b.1r 0,32kw 2780r/min 230 V-Distressed

Siemens Simatic s5 6es5 385-8mb11 6es5385-8mb11 E: 05 Counter Module-SEALED -

EBM-PAPST Fan, Fan k3g250-av29-b2 0,7kw 3450r/min 200 V-Distressed

Kobold measurement Ring kalorimetrischer Flow Limiter Kal-K-UN -

Siemens overload relay 3ua68 00-3g 3ua68003g 400-630a - UN/BOXED -

Bird CENTRAL LUBRICATION PUMP with RESERVOIR CFG 10-w+757

Festo cpv14-vi cpv14vi 18210 Valve Island-Un/Boxed -

Siemens 2kg2121-0vb24-4ad9 Gear Motor

Sew Eurodrive rf37 dt80k4/BMG/TH Gear Motor

Turck BusStop fgdp 10m88-0003 - UN -

Siemens Simatic s5 6es5928-3ub11 6es5 928-3ub11 E: 08 + 6es5376-1aa31 - Distress...

Siemens Simatic s5 6es5928-3ub11 6es5 928-3ub11 E: 08 + 6es5377-0aa32 - Distress...

Siemens Simatic s5 6es5900-7ad11 6es5 900-7ad11 E-Stand: a UN-BNIB

Hirschmann mm4-4tx/sfp mm44txsfp Mice media modules-Distressed

Rexroth FD: 08w17 MMR: 5610120600 08w17 5610120600-UN/BOXED -

Cornelius Compressed Air Unit pearlmax 220098983-UN/BOXED -

Perske... began vs 42.20-2 rotary current motor

Siemens Simatic s5 6es5 955-3lc14 6es5955-3lc14 E-Stand: 05 Distressed

Siemens Simatic s5 6es5 265-8ma01 6es5265-8ma01

Siemens 7tr6200-0/bb 7tr6 200-0/bb - Distressed

Siemens c72451a 91a 2-2 c72451a91a22 Distressed

Siemens 7tt1940-1/dd 7tt1 940-1/dd - Distressed

Siemens m72149-u5890 Scoreboard TU < 65 ° C-Distressed

Siemens c72451 a191 a151 c72451a191a151-Distressed

Siemens c72451a 225a 10-3 c72451a225a103 Distressed

Siemens 7tl4510-0-z/cc x04 7tl4 510-0-z/cc - Distressed

Siemens Simatic s5 6es5 928-3ub11 6es5928-3ub11 e:8 + 6es5377-0ba31 Distressed

SIKO ig09m-0111 abx-1000-pp ig09m0111abx1000pp-UN/BOXED -

Bosch PC epr400 EPR 400 041351 -203401

Rittal 46/34733/001 operating housing command panel-un -

Bosch PC ram400 RAM 400 36762-309401 - UN -

Bosch PC t/z400 T/Z 400 36680-314401 - UN -

Siemens 7tl29 12-0aa1 7tl2912-0aa1 - Distressed

Siemens 7tm2732-2/cc 7tm27322cc-Distressed

Siemens 7tm4732-7/cc 7tm4 732-7/cc - Distressed

Bus St 601 st601 Distressed

Bosch PC e24v E 24v - 038766-206401 - UN -

Siemens Simatic s5 6es5 926-3sa11 6es5926-3sa11 E-Stand: 08-UN/BOXED -

Siemens sinaut 6nh9810-2t 6nh9 810-2t Modem MD 125 E-Stand: 03 Distressed

Farnell p350/125 P 350 125-UN/BOXED -

Elrest 107131 ASYS/can/p100/v1.31 BCE-elacan Front panel Control Unit-UN -

Siemens Simatic s5 6es5928-3ub11 6es5 928-3ub11 E: 01 + 6es5376-0aa21 - Distress...

Rittal El 2256 600 el2256600 Enclosure-UN -

Stephan Scand-AC VPM sl750-1 sl7501 Distressed

Siemens Simatic s5 6es5484-8ad11 6es5 484-8ad11

Konschok + Seidel Milling Spindle

Heidenhain ERN 170-5000 343 792 -01 Encoder/Encoder-Distressed

Siemens Simatic s5 6es5 955-3lc33 6es5955-3lc33 E-Stand: 01 Distressed

Festo 163398 wn08, dnc-63-140-ppv-a-kp Cylinder with Locking Unit-Un/Boxed

AEG mt23c-1041-000 MT 23 c-1041-000 Permanent Magnet AC Servo Motor-un -

Siemens Simatic s5 6es5 955-3lc14 6es5955-3lc14 E-Stand: 16 Distressed

Siemens sidac 4ep3601-3ds00 kommutierungsdrossel-UN/BOXED -

Siemens Simatic s5 6es5 456-4ua12 6es5456-4ua12 e:1

Siemens Simatic s5 6es5 955-3lc14 6es5955-3lc14 E-Stand: 11 Distressed

St?ber GEARBOX P 71 2 SPNO 150m 130/165/32 P 712 SPNO 150m-UN -

Stromag Spring Pressure Brake bzfm 2.5 V 10 Art. No. 401-02557 - UN -

Beluk BLR-cm 06 blrcm 06 blind output controller-/In Box

Alpha Planet Gear TPK 025-mf2-5-060-000 Art. No. 20014654-UN -

Siemens Simatic 6es7460-1ba00-0ab0 6es7 460-1ba00-0ab0

Siemens Simatic s5 6es5981-0ha11 6es5 981-0ha11 E-Stand: 03 Distressed

Siemens Simatic s5 6es5 981-0ha11 6es5981-0ha11 E-Stand: K.A. Distressed

Sew Eurodrive PLANETARY GEAR RPL 30-1ek rpl30-1-ek - UN -

Siemens Simatic s5 6es5 981-0ha11 6es5981-0ha11 E-Stand: 02 Distressed

Siemens Load Feeder 3rk1300-1cs01-1aa0 3rk1 300-1cs01-1aa0 e:2 - UN -

Siemens Sinumerik 6fx1124-6aa02 6fx1 124-6aa02 E: B

Siemens Simatic s5 Digital Input 6es5420-4ua13 6es5 420-4ua13 e:02 - SEALED -

Siemens Simatic s5 6es5955-3lc13 6es5 955-3lc13 - Distressed

Sick ws24-x2301 2015728 Channel Light Curtain-UN/BOXED -

Sauer & Danfoss STEERING Drive with Engine p125/05+ Drinks. SP 81

Dunkermotoren BG 63x55/snr 88563 02250 with Planet Gear PLG 52-UN -

Siemens Simatic s5 6es5 488-3la31 6es5488-3la31 E: 3- in Box

Schabmüller Steering Drive with p125/05 Engine + Drinks -.ims81-5

Danfoss Two Stage Pilot-Solenoid Valve pmlx 40 pmlx40 027f3033-UN/BOXED -

Siemens Simatic s5 6es5420-4ub14 6es5 420-4ub12

AEG Microverter 2.8/230v FREQUENCY INVERTER- -

Siemens sortplan Display 32.1531.998-00 32153199800 Distressed

Siemens 6es5484-8af11 6es5 484-8af11

Schneider Automation TSX QUANTUM 140 CPS 114 10

Siemens Simatic s5 6es5 305-7la11 6es5305-7la11 E-Stand: 02-SEALED -

SMB Servo Motor sbk7-0500-30-0

Siemens Line Filter 6sl3000-0be23-6aa0 6sl3 000-0be23-6aa0 36 KW Ver. a-Distress...

Hübner Berlin Encoder Hog 100 DN 3072 I hog100dn3072i-UN -

Indramat A.C. Servo Bleeder-TBM TBM 1.1-020-w1 tbm1.1-020-w1

Siemens g24 g5/25 wrgd 6ev3054-0gc 6ev 3054-0gc E-Stand: F-Distressed

Siemens Simatic s5 6es5305-7la11 6es5 305-7la11 E-Stand: K.A. - Closed OVP -

Siemens Simatic s5 6es5 305-7la11 6es5305-7la11 E-Stand: 4-SEALED -

Sew Eurodrive Movitrac 1006-403-4-00 1006403400 item no. 825527x-Distressed

Tax Card SR 6000 02sp02m sr600002sp02m-Distressed

Siemens Simatic s5 6es5187-5ua11 6es5 187-5ua11 + 7x Riser-Distressed

NICE vibration technology NEG 500102-s1

Pilz PNOZ x9 No.: 774606 safety switchgear-UN-BNIB -

Siemens smp-e227-a2 c8451-a12-a96-1

Allen Bradley 1772-lh Processor Interface Module 1772lh-UN -

Siemens Simatic s5 6es5 924-3sa12 6es59243sa12 E-Stand: 1 Distressed

Siemens Simatic s5-110a 6es5 900 7ad11 Central Assembly E-Stand: a-UN/BOXED ...

Phoenix Contact IBS STME 24 BK Dio 8/8/3-t 24vdc Bus Terminal at 8 Dig. input-Un...

Allen Bradley 1771-db/b Basic Modules Series: B 1771dbb

Angel drives gnm4 125-g8n Gear Motor-un -

Flender Sky 09.f4.s1d-5n00/1.2 09f4s1d5n0012

Siemens Micromaster 420 6se6420-2ab15-5aa1 E-Stand: d02/1.18 Distressed

Siemens Simatic s5 6es5 095-8mc01 6es5095-8mc01 E-Stand: 04 Distressed

VIPA Siemens vc3-bg27

Siemens ASM 400/401/500 6gt2002-0aa00 + 2x 6gt2002-0ab00 - Distressed

Sick c20s-060102a11 Transmitter-Un -

B & R ECPP 40if4-0n

VIPA Siemens vc1-8627

Festo ms6-sfe-f5-p2u-m12 no 538422 FLOW SENSOR-UN/BOXED -

Siemens Simatic s5 6es5 372-0aa61 6es5372-0aa61

Siemens Simatic s5 6es5 955-3lf12 6es5955-3lf12 E-Stand: 11 Distressed

Sew Gear Motor r17 dr63l4

Bihl + Wiedemann as-I 3.0 PROFIBUS

Siemens Simatic s5 6es5 955-3lc14 6es5955-3lc14 E-Stand: 08 Distressed

Siemens Professional Safe 3rk1903-3ba00 3rk1 903-3ba00

Indramat fwc-dsm2.1-c11-03v06-ms fwc-dsm2.1 Distressed

Indramat DSM 2.1-asm-01.rs dsm2.1 Distressed

Siebert scd30-270 LED Indicator Industrial Display 11.950820.90 with Tripod

Indramat fwc-dsm2.1-c11-03v07-ms Module-Distressed

Siemens Simatic s5 6es5 480-1aa12 6es5480-1aa12

Nemic-Lambda EWS 300p-12 Power Supply

Siemens Simatic s5 6es5 921-3ua12 6es5921-3ua12 E-Stand: 12 Distressed

Ssiemens SIMATIC s5 6es5187-5ua11 6es5 187-5ua11 E-Stand: 02-UN/BOXED -

Hirschmann Star Coupler Base Unit Rack ASGE 1-r E AC-UN/BOXED -

IER 520 Label Printer 520a02 Thermal Label Printer-UN/BOXED -

Schenck Load Cell Type: RCM 0.33

Keb Combivert f5 04.f5.s3a-zm00

Sew Eurodrive rf17 dr63l4/tf

Sew Eurodrive r17 dr63l4/tf Gear Motor-un -

ASM way Sensor ws17kt-5000-5-pp530-sab5

Keb RF Filter 19.e4.t60-1001

Alpha GEARBOX LP 120-m02-50-111-000 Distressed

Siemens Simatic s5 6es5242-1aa32 6es5 242-1aa32 E-Stand: a1 Distressed

Siemens Simatic s5 6es5946-3ua22 6es5 946-3ua22 E-Stand: 04 Distressed

Sew Eurodrive s32 dt71d2tf b8a Gear Motor

Berger Lahr ifa62/dpoisds/5dm - 154/0-001rpp41 & Motovario Drinks. NMRV 030 UNUS...

Sew Eurodrive r17 dr63s4/br/hr Gear Motor-un -

Rexrotth Indramat GEARBOX gtm100 -- nn-003d-nn16 - Gearbox

Keb Drive Technology 07.f0.r01-4a08 Inverter 1,8 KVA

MITSUBISHI Melsec fx2n-32mr-es FX 2 N 32 MREs-Distressed (lid top is missing)

Bauer geared motor with brake bs02-71v/d04la6-s/e003b9

Heidenhain ROD 426.003 1000 Encoder-UN -

SMC Rotary Clamp Cylinder emk2b63-50r Pneumatic Cylinder-Un/Boxed -

ELEKTRIM Gear Motor SKG 63-4b2

EBM PAPST FAN w2d300-cp02-31 FAN-UN/BOXED -

Italvibra Vibration Motor MVSI 3/100p-s02 Vibrator Motor Vibrator-UN -

Siemens Simatic s5 6es5 440-5aa11 6es5440-5aa11 E: 02-Un/In Box

Jean Müller SASIL a5l23011d103 SASIL-pl00/h31/ar-h/1w100-1m/mb15 - UN/BOXED ...

Siemens Simatic s5 6es5 488-3la31 6es5488-3la31

Leuze RK 78/4r-2000 - UN/BOXED -

RSF Elektronik MSA 670.23 msa670.23 720mm-UN/BOXED -

Kniel Power bsü 5.10 No. 222-000-21 - UN -

E. Dold & Sons KG Ader Break Relay ai940 ai9403ac50/60hz - UN/BOXED -

FEMA Honeywell pressure switch DWR 6 Pressure Limiter-UN/BOXED -

Siemens overload relay 3rb12 3rb1246-1eb00 3rb1 246-1eb00 - Distressed

Festo Linear Unit 161792 p108, DGPL - 25-260-ppv-a-kf-b - Distressed

Siemens Built - in Power Supply Unit svs2 g24 g5/25 wrgd 6ev3054-0gc 6ev 3054-0g...

KOYO Direct Logic 205 Programmable Logic Controller w/8 modules-Distressed

Yaskawa ugtmem - 01lb4 + HEDL - 6540 Encoder

Phoenix Contact Interbus IBS IP 500 ELR 2-6a di8/4 2751742-Distressed

Phoenix Contact Interbus IBS IP 400 me-ELR 2-3a di4

Phoenix Contact psr-spp-24uc/esd/4x1/1x2/600 Ord. no 2963967

OMRON INVERTER 3g3ev-ab015ma - Cues 1 Distressed

Lenze inverter e82ev751_4c - Distressed

Doepke Leakage Protection Switch Type DFS 4 40-4/0, 1-UN/BOXED -

Siemens Simatic s5 6es5095-8md01 6es5 095-8md01 E: 03 + 6es5375-1la15 - Distress...

Lust Inverter vf1202s 0,375kw - Distressed

Siemens 3rk1322-1bs00-0aa0 Qty: 1

Lenze 8300 8307_a.1f.23 338121-Distressed

Siemens-UPS Power Supply for ipc32-r - 6ap1 940-0gq00 - /In Box

Festo dgp-40-685 - ppva-B 161782 Linear Unit-UN -

Festo Linear Unit DGPL - 25-50 - ppva-KFB

Indramat DEAB 01-00 DEAB 0100 Distressed

Siemens halbleiterschütz 3rf1433-0jc04 3rf1 433-0jc04 - Distressed

Yaskawa GPD 315/v7 Inverter CIMR-v7am20p1-UN -

Magpowr hb61 HB 61-UN -

Eaton Hydraulic Motor 406-90-0021 406900021-UN -

Pacesetter Gearmotor 48 R 6 BFPP - 5h 48 R 6 BFPP 5h-UN -

Allen-Bradley 22-COMM-C Series A UNSEALED

Eaton Hydraulic Motor 406-90-0019 406900019-UN -

Eaton Hydraulic Motor 406-90-0025 406900025-UN -

Spire 912-0401 Load & Measurement Board-Un -

Thomson Electrak Pro Series pr2405-2b65-04m042 - Distressed

OMRON cj1w-id232 Input Unit-UN/BOXED -

Pfeiffer Vacuum EVB 025 PA evb025pa

Emerson SDN 10-24-100p sdn1024100p PSU Power Supply-UN/BOXED -

Bodine Gear Motor 48 RGBF pp-5h

Rittal CP 6392009 command panels VIP 6000 Enclosure

Siemens TELEPERM C m74003-a8311 e:02 - UN/BOXED -

Siemens 6ev5 000-1bc 6ev5000-1bc - BOXED -

Siemens TELEPERM e65000-f100-a12 - BOXED -

Schrader Bellows Inline Valve P/N n35544001 2460-UN/BOXED -

Schrader Bellows Inline Valve P/N n355-46-046 - UN -

Morse Power Gear 13 GCDB L-R 56c mio290 lo9k-UN -

AEG Control Unit THYRO-M 763-725-030.01 76372503001

Kollmorgen Seidel sr6-6smx7 4m Mat. No. 90083

Sew Eurodrive Gear Motor WA 30/t drs71m4/tf

MKS MASS Flo Controller 2179bx14cg1bv 10000 SCCM 

Schunk ose-b34 354310 oseb 34 SWIVEL UNIT-UN -

Westinghouse Electric Corporation nl1075b 2623d37g01 Sub 10-UN/BOXED -

Siemens Simatic s5 6es5242-1aa32 6es5 242-1aa32 E-Stand: a4 Distressed

Thomson Electrak Pro Series pr2405-2b65-04m042 Actuator