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DCS系统在工业生产过程的广泛应用，使可靠性、稳定性问题更加突出，也使人们对整个系统要求越来越高。人们希望DCS系统尽量少出故障，又希望DCS系统一旦出现故障，能尽快诊断出故障部位，并尽快修复，使系统重新工作。下面简单介绍故障大体分类及故障诊断的一般方法。
　　一、DCS系统故障的分类
　　为了便于分析、诊断DCS系统故障发生的部位和产生原因，可以把故障大致分为如下几类。
　　1、现场仪表设备故障
　　现场仪表设备包括与生产过程直接联系的各种变送器、各种开关、执行机构、负载等。现场仪表设备发生故障，直接影响DCS系统的控制功能。在目前的DCS控制系统中，这类故障占绝大部分。这类故障一般是由于仪表设备本身的质量和寿命所致。
　　2、系统故障
　　这是影响系统运行的全局性故障。系统故障可分为固定性故障和偶然性故障。这类故障一般比较明显且影响也是局部的，它们主要是由使用不当或使用时间较长，模板内元件老化所致。
　　3、硬件故障
　　这类故障主要指DCS系统中的模板(特别是I/O模板)损坏造成的故障。这类故障一般比较明显且影响也是局部的，它们主要是由使用不当或使用时间较长，模板内元件老化所致。
　　4、软件故障
　　这类故障是软件本身所包含的错误所引起的，软件故障又可分为系统软件故障和应用软件故障。系统软件是DCS系统带来的，若设计考虑不周，在执行中一旦条件满足就会引发故障，造成停机或死机等现象。此类故障并不常见。应用软件是用户自己编定的。在实际工程应用中，由于应用软件工作复杂，工作量大，因此软件错误几乎难以避免，这就要求在DCS系统调试及试运行中十分认真，及时发现并解决。
　　5、操作、使用不当造成故障
　　在实际运行操作中，有时会出现DCS系统某功能不能使用或某控制不封不能正常工作，但实际上DCS系统并没有毛病，而是操作人员操作不熟练或操作错误所引起的。这对于初次使用DCS系统的操作工较为常见。

SIEMENS Simodrive 6SN1118-0DG23-0AA0 6SN11180DG230AA0

SIEMENS 24VDC DMP COMPACT INPUT MODULE 6FC5111-0CA01-0AA0

Allen-Bradley SLC 500 Output Module 1746-0W16

ABB 57088443 MEM 86-192K + 192K RAM Memory DCG 3200-MR2 AB Stromberg 200342

ABB robots: Servo motor 3HAC17326-1 / 3HAC021346-001 for IRB 2400

A202K4AC CUTLER HAMMER A202K4AC

0.250" x 25" Vamco Servo Feeder Model: CFS-30II S/N: HDC42530PVPCL13

RELIANCE ELECTRIC VZ3000-RIPS-2 USPP VZ3000RIPS2

XYCOM 4860-101B USPP 4860101B

FANUC A16B-0180-0260 USPP A16B01800260

EMERSON AX-4000-00-00-00C USPP AX4000000000C

RELIANCE ELECTRIC 86466-76R NSFP 8646676R

OMRON CV1000-CPU01-EV1 USPP CV1000CPU01EV1

OMRON V740-BA50C02-US NSFP V740BA50C02US

Siemens 6ES5 441-7LA13 6ES54417LA13

Siemens 6ES5-921-3WB15 NSPP 6ES59213WB15

SIEMENS 6ES5-410-7AA11 USPP 6ES54107AA11

Siemens 6ES5 441-8MA11 8 POINT DIGITAL OUTPUT MODULE

Siemens S5 6ES5 421-8MA12 6ES54218MA12

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Spectrum Controls 8000 SAI-201

MSD 8870 GM Coil Pack Interface Module For DIS

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Siemens RWR490.40/MCQ McQuay over 95%

Reliance 0-58504

Schneider Modicon Inkworks 2006.

Schneider Modicon AS-B260-001 USPP ASB260001

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Schneider Modicon AS-B840-108

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Modicon MM-PM10-300 PanelMate Plus MMPM10300

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Siemens 6ES5100-8MA02 6ES5 100-8MA02 SIMATIC S5-100U CPU100 Controller

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SIEMENS 6DD2920-0AR1 TRANSFORMER SA61

SIEMENS SINUMERIK 840D/840DE NCU 571.2 6FC5357-0BA10-0AE0

SIEMENS 6SN1113-1AA00-1JA1 USPP 6SN11131AA001JA1

SIEMENS Simodrive 611 LT 15A 6SN1124-1AB00-0AA1

SIEMENS 6FC9344-5PA NSFP 6FC93445PA

Advantech PCA-6003VE in Excellent Condition

Allen-Bradley 1771-OBD/B VDC Output Module - ATS 365 Warranty

ABB ACS800-U1-0020-7 AC Drive 15/20HP

Adept 060 Processor Board 10332-00716

6FC3551-1AC-Z SIEMENS MONITORS CRT REMANUFACTURED

92-00922-01 MODICON CONTROLLERS REMANUFACTURED

SQUARE D S164A NSFP S164A

CONTROL TECHNIQUES UNI3203LV NSPP UNI3203LV

BOSCH VM50/B-TC-1-3/PE USPP VM50BTC13PE

NACHI ROP500 USPP ROP500

MEASUREX 51304754-150 NSPP 51304754150

FANUC A20B-0007-0360 USPP A20B00070360

Siemens 6ES5 188-3UA11 6ES51883UA11

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SIEMENS 6ES5-100-8MA02 USPP 6ES51008MA02

SIEMENS S5 BUS MODULE 6ES5 700-8MA11

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Siemens TD200 6ES7 272-0AA00-0YA0 6ES7272-0AA00-0YA0 Worldwide

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Interface module for CPU B/D EFC-5000

YOSHIMURA FOR SUZUKI KINGQUAD 750 08-1

SIEMENS 6ES5-942-7UA13 6ES5942-7UA13

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Oriental Motor UDX5114N-E

Schneider Modicon AS-B885-002 COMMUNICATION MODULE ASB885002

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Schneider Modicon AS-B883-200 ASB883200 Thermocouple Input

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Schneider/Modicon TM2AMI2HT in Box

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SIEMENS Sinumerik 820 GA2/GA3 CNC Instruction Manual

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SIEMENS SIMODRIVE 6SN1145-1BA02-0CA1SINUMETIK 840D NCU-BOX 6FC52476FC5357

SIEMENS SIMODRIVE 6SN1145-1AA01-0AA1SINUMETIK 840D NCU-BOX 6FC52476FC5356 B2

Advantech Motherboard PCA-6114P4 REV:A1.02

ALLEN-BRADLEY 2750-PA POWER SUPPLY

ABB 3HAB6182-1 CPU BOARD DSQC-335 3HAB61821

ACCURAY 100638-0030 USPP 1006380030

A16B-0190-0060 / A16B-0190-0061 FANUC 2000C / 3000C

810A01B ALLEN BRADLEY 810 A01B

SIEMENS 6ES5-944-7UA22 USPP 6ES59447UA22

ASEA BROWN BOVERI 57310001-CX USPP 57310001CX

ALLEN BRADLEY 8410-MTVE NSFP 8410MTVE

MAGNETEK 71616-G3M40301 USPP 71616G3M40301

HITACHI SJ300-450HFU USPP SJ300450HFU

ALLEN BRADLEY 1336S-BRF50-AN-L4-MX1 USPP 1336SBRF50ANL4

RELIANCE ELECTRIC 57C-409 NSPP 57C409

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SIEMENS 6ES5 451-4UA11 6ES54514UA11

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PWR-C45-1400DC C4500 1400W DC TRIPLE INPUT SP POWER SUPPLY 1YR - ASK

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Modicon SW-AP9T-ATA

Schneider Modicon GOULD 800 SERIES 7 SLOT RACK AS-H819-007

Schneider Modicon ASM84A001 Controller AS-M84A-001

Schneider Modicon AS-E381-902 Module Memory Exec Cartridge

Schneider Modicon AS-S908-110

Schneider Modicon AS-B230-501

Schneider Modicon N.O/N.C RELAY OUTPUT MODULE AS-B814-108 NIB

Schneider TSX08EA4C1 Telemecanique MODICON NESA PLC NIB

Schneider MODICON AS-BADU-206

PMA DC 150-CAN intelligent DDC control PLC 16 digital I/O 9407 700 50341

SIEMENS 6ES0-451-8MR12/6ES0451-8MR12 RELAY OUTPUT MODULE XLNT

SIEMENS 6FC5357-0BB21-0AE0 DRIVE SINUMERIK 840D/E2 NCU 572.2 VERSION A

GOOD ALLEN-BRADLEY COMMUNICATION ADAPTER MODULE 1771-KA2 1771KA2

SIEMENS SIMODRIVE Controller Board 6SN1118-0AA11-0AA0 6SC6110-0EA00

SIEMENS SINUMERIK 6FC9320-5DC00 ELECTRONIC HANDWHEEL

SIEMENS 15747-130 SERVO PEN MOORE RECORDER 15747130

Allen-Bradley PanelView 1200 Operator Interface 2711TC1MC

5913868 Grossenbacher TRIPLE AXIS BOARD 5070084

ABB VFD Drive Motor Control 460 V 125 Hp ACS800-U1-0120-5+P901 90 Grnty

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74S51 IC 14 Pin Dip- Dual 2-Wide 2-IN AND/OR/Invert Gate

RELIANCE ELECTRIC 45C-231 USPP 45C231

ALLEN BRADLEY 1785-V40B USPP 1785V40B

ALLEN BRADLEY 150FPP60B FNFP 150FPP60B

GIDDINGS & LEWIS 401-34328-01 USPP 4013432801

ULTRA SONIC SEAL T-2010 USPP T2010

TELEMECANIQUE LC1-F5002 NSPP LC1F5002

FOXBORO P0400YE-0K USPP P0400YE0K

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SIEMENS 6ES5-951-7LB13/6ES5951-7LB13 E220-G5-3WRGD XLNT

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Siemens 6ES5 375-0LD31 6ES53750LD31 Memory

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REMAN Allen Bradley 1794-IT8 /A 1794-1T8 Flex I/O Analog Input

Texas Instruments 305-01N

Spirent Adtech A/X4000 400325 OC-12c/STM-4c Interface

VMETRO VME Midas M120R-16D2 with I/O modules DPIO-LI/32k/16bit DPIO-LI/32k

Siemens C98043-7002-L1

Modicon AS-T984-106

Schneider Modicon AUTOMATION DEP 216 AS-BDEP-216 DISCRETE INPUT NO WIRE 16X24 VDC

Schneider Modicon /AS-BNUL-200 Prewired Blank Unit

Schneider Modicon AS-BADU-205 USPP ASBADU205

Schneider Modicon ASB821008 UNIT Gould 10-60 VDC Input Module AS-B821-008

Schneider Modicon POWER SUPPLY AS-P840-000 15A0287 115/230V

Schneider Modicon AS-S902-131 | 12 mo. warranty | Free UK/EU Shipping | Price Inc UK VAT

SCHNEIDER 140 MSB 101 00 in Box 140 MSB101 00 140MSB10100

Sentry Switched CDU CX-16V1-L30M Expansion Module Input/Output 120V 24A

Reliance 57401 57401-2 Digital I/O Module NIB

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SIEMENS SINUMERIK 800 6FX1121-4BB03 6FX11214BB03

NOTIFIER NCM-W NETWORK COMMUNICATION MODULE

SIEMENS SIMODRIVE 611 6SN1118-0DM31-0AA1

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ALLENBRADLEY1771-OAD/CACOUTPUTMODULE

Allen Bradley SLC500 1746-OB16E Output Module Series B

ABB PM802F 3BDH00002R1 proper functioning

YS 110420 UC-360DZL Inspection Station / Conveyor

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MODICON AS-9000-451 USPP AS9000451

ALLEN BRADLEY 1395-B63-D1-P50-X1 USPP 1395B63D1P50X1

HARMONIC DRIVE 472446-1 NSFP 4724461

GE FANUC IC3600SSVG1 USPP IC3600SSVG1

SIEMENS 6SE7022-1EP50 USPP 6SE70221EP50

SIEMENS 6AV66120AA512CA5 FNFP 6AV66120AA512CA5

ALLEN BRADLEY 1746-HSCE2 FNFP 1746HSCE2

Siemens 6ES5 923-3UC11 -FS- 6ES59233UC11

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SIEMENS 6ES5-482-8MA13 NSPP 6ES54828MA13

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Siemens S5-101U 6ES5 101-8UC31

SIEMENS DDC Controller 549-210

Schneider PLC Remote I/O Interface Module 140CRA93100

Square D 8884 SMM-1000

SIEMENS 6ES5-312-5CA21 INTERFACE MODULE 6ES53125CA21

WE SHIP SAME CISCO WS-C3750-48PS-S CATALYST 3750-48PS SWICTH 1 YR WARRANT

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Schneider Modicon AS-BDAU-202 /Schneider Analog Out ASBDAU202

Schneider Modicon AS-B814-108 NSFP ASB814108

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Schneider Modicon AS-P452-012

Schneider Modicon AS-BDAP-210 Output Module DAP-210 Model 042279065 EXCELLENT

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SIEMENS SINUMERIK 810 I/O BOARD 6FX 1124-6AA

Send Us Your Best Offer90 Day warranty on all parts

SIEMENS 6SN1-146-1AB00-0BA1 USPP 6SN11461AB000BA1

SIEMENS 6SC6500-0NA02 SIMODRIVE BOARD EXCELLENT CONDITION

SIEMENS 6FC5112-0EA03-0AA0 USPP 6FC51120EA030AA0

Allen-BradleyElectromechanicalContactOutputModule1771-0W16/B

ALLEN BRADLEY X-137733 NSPP X137733

ABB DSQC 328A 3HAC 17970-1 DIGITAL I/O UNIT 24VDC

ADJUSTABLE SPEED DRIVE 303D0628

(ABB)DCS Freelance2000 Spare parts DAI 04 good in condition for industry use

INDUSTRIAL DEVICES B8962-FK1B-AAAA-FF NSPP B8962FK1BAAAAFF

YASKAWA ELECTRIC CIMR-P5U20370F NSFP CIMRP5U20370F

FANUC A860-0055-T061 USPP A8600055T061

EUROTHERM DRIVES 590L-0105-9-1-0-0-2-0-0750-310-012-400-0-00-00-00-00-000 USPP 5

Returns: Accepted within 7 days

PBM INC MIH-37-TT3 NSPP MIH37TT3

PIONEER MAGNETICS PM3386B-6-5 NSFP PM3386B65

Siemens 6ES5 453-4UA12 6ES54534UA12

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SIEMENS 6ES5-420-7LA11 NSPP 6ES54207LA11

Siemens 6ES5 451-8MR12 RELAY OUTPUT MODULE

Siemens S5 6ES5 431-8MA11 6ES54318MA11 Digital Input Module

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Siemens 6ES7 323-1BH01-0AA0 -FS- 6ES73231BH010AA0

Spectrum Controls SBAO-1002-11

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Reliance 411027-51S

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