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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。

Tripp Lite USB Server Interface Module

SIEMENS 6ED1052-1CC00-0BA4 6ED10521CC000BA4 ping

Siemens OP37 6AV3637-1LL00-0AX0 Membrane Keypad FS

Schneider Modicon TSX Compact AS-BDAP-217 ASBDAP217

Schneider Modicon AC POWER CONVERTER MODEL AS-P120-000

Schneider Modicon AS-B814-108 ASB814108 Relay Output

Schneider Modicon AS-B838-032 USPP ASB838032

Schneider Modicon AS-S902-121 Memory Module

Schneider Modicon AS-BZAE-204

Schneider Modicon AS-P120-000 P120 Compact 115/230V AC Power Supply WARRANTY

Schneider Modicon High Speed Counter AS-B883-001

Schneider Telemecanique Overload Relay LRD16KN

SCHNEIDER AUTOMATION MODICON TSX 140DA154000 INPUT MODULE

PWR-950-AC 950W AC P/S FOR CISCO 7600 AND CAT 6500

SIEMENS 6ES5451-4UA12 OUTPUT MODULE 32POINT .5AMP 24VDC IN A BOX

SIEMENS 6DD1640-0AC012 mo. warrantyFree UK/EU ShippingPrice Inc UK VAT

LS INDUSTRIAL G7L-CUEB RS-232C COMMUNICATION MODULE

SIEMENS Simodrive 6SN1123-1AB00-0HA1

SIEMENS Sinumerik 840C/840CE P/Supp 6FC5114-0AA01-1AA0

SIEMENS /MOORE 15994-21-4 PC BOARD MODULE XLNT

Allen-Bradley SLC 500 Cat. 1746-OA16 Output Module Series D

ALLEN BRADLEY RIGHT HAND DOOR HARDWARE KIT 1494V-L3

ABB SACE E2B/E-1600 OUT OF

A06B-0148-B088#0075 FANUC SERVO MOTORS REMANUFACTURED

6x500m/spool Fujikura Panda Type Polarization Maintaining Fiber 1300nm

ORMEC GN3-J594001 USPP GN3J594001

ALLEN BRADLEY 1771-DMC4 NSPP 1771DMC4

ALLEN BRADLEY 1336S-B007-AX-EN-GM1-L4 USPP 1336SB007AXENGM1

GENERAL ELECTRIC DS200IMCPG1CCB USPP DS200IMCPG1CCB

TB WOODS WFC4020-0CHT USPP WFC40200CHT

SQUARE D ATV-58HD23M2XZU USPP ATV58HD23M2XZU

CONVERGENT ENERGY 054620701 USPP 054620701

Siemens 6ES5 951-7LD21 6ES5951-7LD21

Siemens 6ES5-242-1AA32Counter Module S5-135/55 IP242A

SIEMENS 6ES5-752-0AA12/6ES5752-0AA12 INTERFACE SUBMODULE NIB

Siemens 6ES5 498-1AA11 NSFP 6ES54981AA11

Siemens 6AV6642-0AA11-0AX0 6AV6 642-0AA11-0AX0 TP177A

Siemens LOGO 6ED1 052-1FB00-0BA4 6ED10521FB000BA4

RSP720-3C-10GE Cisco Route Switch Processor 720 with 10 Gigabit EN uplinks Rout

Telemecanique TSX SUP 702

SIEMENS Simatic 6ES5441-4UA11 Comm. Interface Module

Wago 750-493 3-phase power measurement module 1 A

SIEMENS 6SE9522-4DG40

Modicon AS-P464-002

Schneider Modicon Electric Modbus Plus Terminator Connector Kit AS-MBKT-185

Schneider Modicon ASB371001 BCD Register Input Module AS-B371-001

Schneider Modicon AS-B875-001 8 Channel Analog Input

Schneider Modicon AS-B827-032 24VDC Input Module

Schneider Modicon Gould 484 Programmable Controller AS-C484-266

Schneider Modicon AS-J878-000 Modem Module ASJ878000

SCHNEIDER ELECTRIC 140DAO84000 TSX QUANTUM OUTPUT MODULE AC OUT 24-230V

SIEMENS 505-6308 WORD INPUT MODULE 5056308

Reliance Shark 57C554 Remote I/O Interface 57C-554

Siemens 9330 9330DC-126-0ZZZZA Power Meter Display ION Profibus Access

SIEMENS Sinumerik Module Modul #6FC5111-0CA03-0AA2

Prosoft MVI56-GSC Communications Module 2

SIEMENS Module # 6SN1146-1BB00-0EA1 Simodrive 611

SIEMENS SIMODRIVE 6SN1145-1BA01-0DA1SINUMETIK 840D NCU 6FC52476SN11236FC5357

SIEMENS 6FC3984-1FB Tape Reader - Used

Allen-Bradley2707-MVH232MicroViewTerminal

Allen Bradley Terminal Board 9101-1780 Amphenol /Sealed

ABB IRB6600 ROBOT IRB 6600

ZEBRA 090-401-00203-09 USPP 0904010020309

(RR11-1) 1 NIB WESTINGHOUSE A202K3CAZ 100A 600VAC CONTACTOR RR11-1

MITSUBISHI FR-A240-E-37K-TF USPP FRA240E37KTF

ALLEN BRADLEY 1336T-MCB-SP51B NSPP 1336TMCBSP51B

GENERAL ELECTRIC 44B377098-G01 NSPP 44B377098G01

FISHER ROSEMOUNT 3051-CG4A02A1AH2M5 USPP 3051CG4A02A1AH21

SIEMENS 6ES5-902-3SA12 USPP 6ES59023SA12

REXROTH 0-608-820-092 NSPP 0608820092

TEXAS INSTRUMENTS PLC 555-1102 USPP 5551102

Siemens 6ES5 521-8MA21 CP521 SI COMMUNICATION MODULE RE

Siemens 6ES5-981-0HA21 USPP 6ES59810HA21

SIEMENS 6ES5-451-7LA11 OUTPUT MODULE 6ES54517LA11

Siemens 6ES5 316-8MA12 USPP 6ES53168MA12

Siemens S5 Digital Output / 6ES5 441-8MA11

Siemens C98043-A7007-L1-3

Siemens 6ES5 441-4UA11 6ES54414UA11

Square D 8030 CRM-601

Schneider Electric TSXFPCG010 Interface Module FIP/PCMCIA

WMD PDO PHASE DISPLACEMENT OSCILLATOR MODULAR EURORACK MODULE

SIEMENS 6ES7621-6BD02-0AE3 SIMATIC C7-621 ASI ping Worldwide

SIEMENS Touch Glass + Protective film TP177A 6AV6642-0AA11-0AX1

Seco SE2302

Schneider Modicon ASH827103 PERFECT 800 Series Rack AS-H827-103

Schneider Modicon AS-B571-001 NSFP ASB571001

Schneider Modicon CNC Memory Board AS-506P-F12

Schneider Modicon AS-H810-208 USPP ASH810208

Schneider Modicon AS-B840-108 Reed Relay Output

MODICON 5-1/2" PANELMATE PLUS INTERFACE MM-PMC1-100

Siemens 8 Point Input Module Model:505-7028 NIB

Schneider Modicon Premium TSXDEY16A4 TSX DEY 16A4 120VAC Input NIB

Siemens MODULE 8 PT IN 24VDC 5PIN EM141 6ES7-141BF30-0X

SIEMENS Sinumerik 6FX1112-0AA01 E Stand D & 01

SIEMENS SIMATIC S7 CP341 RS232 COMMUNICATIONS MODULE 6ES7 341 6ES7341-1AH01-0AE0

SIEMENS 6SN1123-1AA00-0DA2 ( 6SN11231AA000DA2 ) NIB

SIEMENS 6SN1123-1AB00-0HA1 6SN1 123-1AB00-0HA1 SIMODRIVE 611 Power Module 8A

SIEMENS 6FC5210-0DF05-0AA0 SINUMERIK PCU 50 6FC52100DF050AA0 NIB

AllenBradleyVersaView6176M-15PN/B6176M15PN

ALLEN-BRADLEY 1201-DMA HMI DOOR MOUNT BEZEL

ABB CIRCUIT BOARD DSQC 302

ADEPT TECH 30340-40000 USPP 3034040000

(4) Samsomatic Switches PWA 27-1039 _ PWA271039 _ 143PC03D

INDRAMAT MAC071C-0-JS-4-C/095-A-0/W1520LV USPP MAC071C0JS4C095A

TOPEX 2200-HYC USPP 2200HYC

FANUC A06B-0651-B211 USPP A06B0651B211

DANAHER MOTION MX2000-1C NSFP MX20001C

RELIANCE ELECTRIC 30V4151 USPP 30V4151

MOTOROLA MVME2700-761-I/O USPP MVME2700761IO

LENZE EVS9323-ET NSFP EVS9323ET

Siemens 6ES5 377-0AA32 -- 6ES53770AA32

Siemens 6ES5-701-3LA11 USPP 6ES57013LA11

SIEMENS 6ES5-375-8LA11 NSFP 6ES53758LA11

Siemens 6ES5 376-1AA21 -- 6ES53761AA21

Siemens Digital Output Module S5 6ES5 441-8MA11

Siemens 6SE7 090-0XX84-6FF5 Worldwide

SIEMENS TP37 6AV3637-1PL00-0AX0 Touchscreen Glass

Siemens 6GK1143-0AA01

Mercedes C230/C240/C300 Satellite Radio Universal Media Interface Module OEM

XEON 6.4GT/s Turbo8000GB HDD 24GB TRUE 3CH DDR3 RAM

SIEMENS 6ES7 314-1AF11-0AB0 6ES73141AF110AB0 in Sealed, Old Box

Siemens PG 702 6ES7 702-0AA00-0YA0 6ES7702-0AA00-0YA0

Reliance 0-51879-5

Schneider Modicon AS-B132-000 PLC

Schneider Modicon AS-B109-000 NSFP ASB109000

Schneider Modicon AS-P500-610 USPP ASP500610

Schneider Modicon AS-B804-116 IN A BOX

Schneider Modicon AS-B260 analog output

Modicon Panelmate Plus MM-PM15-403

Siemens Simatic Rack w/ S7-300 Power Supply SM326 Input SM326 Output Modules

Siemens 6ES7 322-1HH01-0AA0 6ES73221HH010AA0

Siemens Simatic Analog Output Module 6ES5 470-7LB11

SIEMENS 6DD1611-0AB0 USPP 6DD16110AB0

SIEMENS Sinumerik Simodrive Sirotec cable lead 6FX2002-3AC02-1AB0

SIEMENS OFFER & WIN 6SN1123-1AA00-0DA0 FOR PARTS

SIEMENS SIMODRIVE 6SN1112-1AC01-0AA1 UEB QUANTITY

SIEMENS CNC I/O Board Module 6FC3984-3RA ___ 6FC 3984

Adlink cPCI-R3700A REV.B1

ALLEN-BRADLEY 1791-OA32 OUTPUT MODULE QUANTITY

ABB ACH550-UH-316A-4+B055 DRIVE 250 HP 200 KW 380-480 VOLT 316 AMP

Acterna-JDSU ONT50

6ES7315-6FF00-0AB0 Brand , Factory Sealed,

898110-1 Curtiss Wright Pump Impeller

SIEMENS A1-106-180-501 USPP A1106180501

BINDER 8661121H11 FNFP 8661121H11

BAILEY CONTROLS 6637447A NSPP 6637447A

MODICON AS-P453-621 NSFP ASP453621

ITE SIEMENS ND63T900 NSFP ND63T900

COMPUMOTOR DR-1015B-115 USPP DR1015B115

Siemens 6ES5 095-8MA01 6ES50958MA01

Siemens 6ES5-456-7LB11 NSFP 6ES54567LB11

SIEMENS 6ES5 760-0AA11 6ES57600AA11

SIEMENS S5 6ES5 464-8ME11 Analog Input

Siemens S56ES5925-3SA11 CPU925 Module

SIEMENS 6ES7-221-1BF10-0XA0 6ES7221-1BF10-0XA0

Siemens Simatic CPU 224 6ES7214-1AD22-0XB0

Siemens 55x9100

Hp A7231-04018 Hp 9000 Ps Interface Cable Module Assy. A7231-04018 Hp9000 Server

WS-X6148-GE-TX Cisco Classic Interface Module Expansion module 48 ports

Siemens 6ES5 464-8ME11 6ES5464-8ME11

Siemens LOGO! PLC 12/24RCo 6ED1052-2MD00-0BA5

Omron C200H-NC112

Schneider Modicon AS-E381-902 ASE381902 Executive Cartridge

Schneider Modicon Program Pack AS-P371-002 Module asp371002

Schneider Modicon AS-J378-000 NSPP ASJ378000

Schneider Modicon 140-EIA-921-00 AS-I Master 1 CH 140EIA92100

Schneider Modicon AS-P930-000 MODULE 6 MON WARR OBSOLETE

Schneider Modicon TSX COMPACT TRUE LOW DISCRETE OUTPUT MODULE DAP 217/AS-BDAP-217

SMC Decentralized Serial Interface Wiring EEX500-IB1-E2 Input Module EX500

Schneider Telemecanique XBTFC064510 XBTFCO64510

SIEMENS TI 505-3532 DC OUTPUT MODULE

Siemens 6AV3 525-1EA01-0AX0 6AV35251EA010AX0 Panel

SIEMENS Sinumerik 6FX1126-8BA00 Control Card Interface

EDWARDS EST 3-FiB FiBER OPTiC COMMUNiCATiONS iNTERFACE MODULE IRC

SIEMENS Simodrive LT-MODUL INT. 80A 6SN1123-1AA00-0DA2

SIEMENS SIMODRIVE 6SN1145-1BA01-0BA1SINUMETIK 840D NCU-BOX 6FC52476FC53572ZF

Adlink cPCI-8211 cPCI-8211/CARSEA-210

ALLEN-BRADLEY 800MB-CPB16SA CONTACT PUSH BUTTON AB

ABB 1600 A Disconnect Switch Part# OETL-NF1600

ACCU SORT 1000062887 USPP 1000062887

A06B-6064-H230 #H550

800' Aluminum URD Syracuse 2/0-2/0-2/0-1 Qudplx Direct burial wire

SIEMENS 1FT6108-8AC71-4EG1 NSFP 1FT61088AC714EG1

ALLEN BRADLEY 8520-1S10A-BAT-EX4-T1-Y-4-5-7 USPP 85201S10ABATEX4T

ALLEN BRADLEY 5150-RS2 USPP 5150RS2

ITE SIEMENS EISHFD63B12AFAFSH NSPP EISHFD63B12AFAFS

GENERAL ELECTRIC DS3800NFCD1K1E USPP DS3800NFCD1K1E

YASKAWA ELECTRIC CACR-PR10BC3CSY10 USPP CACRPR10BC3CSY10

MITSUBISHI FX784B-8 USPP FX784B8

Siemens 6ES5-308-3UC11 USPP 6ES53083UC11

SIEMENS 6ES5 430-7LA12 6ES54307LA12

SIEMENS S5 6ES5 451-4UA14 6ES54514UA14 Input Module

Siemens Digital Output Module 6ES5 440-8MA22 TAKE-OUT

Siemens 6ES7 221-1BF22-0XB0 6ES7221-1BF22-0XB0 NIB

SIEMENS OP270-6 6AV6 542-0CA10-0AX0 Membrane Keypad

Redback PIM-500-E3 1 Port BNC E3 for SMS 500 90

Texas Instruments 5TI5-25806

TERAWAVE 10068-01 M2-0-ALL/2C/RS/ATM/ED Interface Module FREE SHIP

TSXDET3232 Modicon Premium 24 VDC Input TSX-DET-3232

Siemens E48/40 WBUG FG0 GR60 48V40A Rectifier Module

Modicon MM-PMTS-200

Schneider Modicon AUTOMATION AS-BDA P-210 MODULE 5124

Schneider Modicon ASBCTR205 High Speed Counter Module AS-BCTR-205

Schneider Modicon AS-BZAE-204 USPP ASBZAE204

Schneider Modicon ASH827209 PERFECT 800 Series Rack AS-H827-209

Schneider Modicon /MODICON DTA-201/AS-HDTA-201 5-SLOT SUBRACK

Schneider Modicon Input Module AS-B805-016

Schneider Telemecanique TSX Nesa TSX08H04M HMI Panel

SCHNEIDER AEG DEP218 AS-BDEP-218 TSX COMPACT INPUT MODULE 65

PWR-2821-51-AC CISCO 2821 2851 AC POWER SUPPLY

SIEMENS 6ES5-441-4UA14/6ES5441-4UA14 OUTPUT MODULE XLNT

SIEMENS 6DD1660-0AH1 CS51 Free Ship

KLOCKNER-MOELLER UM 1.2-3 COMMUNICATION MODULE UM1.2-3 UM123

SIEMENS Simodrive 6SN1135-1BA11-0CA0 CMI# 1-230-1035A

SIEMENS Sinumerik 840C Interface 6FC5103-0AD13-0AA0_ T-K42025281 Version C

SIEMENS MOORE PRODUCTS 66BA4 PNEUMATIC RELAY 1:4 RATIO 1/4NPT 54715

Allen-Bradley Remote Keypad

520 iKANOS Fusiv IKF68331-A1-PB1-C chips 4/each

ABB SACE-E2B/E-1600 EMAX Power Breaker 1600A 400VAC

A06B-0148-B177#7008 FANUC SERVO MOTORS

700' 4/4 SO SOOW SJO SJOOW Black Portable Cord Cable Wire American DUrable

PERCEPTRON 9110017 USPP 9110017

ALLEN BRADLEY 1775-MEA NSPP 1775MEA

ALLEN BRADLEY 1336S-B015-AA-EN-GM1-HA2-L6 USPP 1336SB015AAENGMA