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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。

ADEPT TECH 260-0420 USPP 2600420

INDRAMAT CLM01.3-X-0-2-0 USPP CLM013X020

PRECISE SC65 USPP SC65

LENZE EVS9326-ES USPP EVS9326ES

YAMATAKE 80360146-011 USPP 80360146011

RELIANCE ELECTRIC 0-51890-3 USPP 0518903

Siemens 6ES5 456-7LA11 DIGITAL OUTPUT

Siemens 6ES5-926-3KU12 USPP 6ES59263KU12

SIEMENS 6ES5-430-4UA12 NSFP 6ES54304UA12

Siemens 6ES5 460-7LA13 Analog Input 6ES5460-7LA13

Siemens S5 6ES5 441-8MA11 8x24V DIGITAL OUTPUT

Siemens 7MF4033-1DA00-1AA6-Z Pressure Transmitter

Siemens 6ES7 322-1EH01-0AA0 -FS- 6ES73221EH010AA0

Square D 8003 CP-32

NIB PHOENIX CONTACT PSM-EG-RS232/TTY-P/ 2K INTERFACE CONVERTER MODULE RS-232 24V

WS-SUP720-3BXL WS-X6716-10G-3CXL CiscoDeal

Siemens 6ES7 972-0BB41-0XA0 in Box ping Worldwide

Siemens S7-200 EM231 6ES7 231-0HC21-0XA0 EM 231

Reliance 45C344

Schneider Modicon GOULD REMOTE I/O DRIVER MODEL AS-J820-001

Schneider Modicon AS-B350-001 USPP ASB350001

Schneider Modicon AS-S902-111 USPP ASS902111

Schneider Modicon AS-B873-011 800 I/O ANALOG INPUT MODULE NIB

Schneider Modicon AS-B805-016 B805 115Vac 16Pt Input Molule Mod AS ASB805016 WOW

Modicon Communications Slave Part J474

Siemens S5 6ES5 420-4UA13 6ES54204UA13 Input Module

Siemens 6ES5 464-8MC11 6ES54648MC11

Siemens RS 485-REPEATER 6ES7-972-0AA00-0XA0

SIEMENS 6FC5370-0AA00-0AA0 SINUMERIK 802D /PCU 210.3

Woodhead SST-PFB3-VME-2-E Communication Module WOW

SIEMENS 6SN1118-0AD11-0AA1 6SN1 118-0AD11-0AA1 SIMODRIVE 611 Control Board

SIEMENS SIMODRIVE 611 6SN1123-1AA00-0CA0

SIEMENS 6FC5510-0BA00-0AA0 USPP 6FC55100BA000AA0

Advantech PCA-6186VE PCA-6186 Rev.B2 NIB

Allen-Bradley 1771-OA AC OUTPUT MODULE

ABB ASEA BROWN BOVERI POWER ITE AIR CIRCUIT BREAKER 800A 800 AMP KDON K-DON 800S

ADEPT 90400-60131 AMPLIFIER MODULE MEGATORQUE 300 WATT CONTROLLER

6SE7026-0TP50 SIEMENS COMPACT + MASTERDRIVE 59AMP 30kW 510-620VDC MOTION CNTRL

SYMAX 8020-SCP-424 NSPP 8020SCP424

CUTLER HAMMER IDT0286 NSFP IDT0286

CLEVELAND MOTION CONTROL BNR5110GPA00CS0002 NSPP BNR5110GPAOOCS00

NEMATRON CORP IWS-4824 USPP IWS4824

MITSUBISHI FR-A520-2.2K-NA USPP FRA52022KNA

GE FANUC 44A719348-102 USPP 44A719348102

Siemens 6ES5 246-4UA11 6ES52464UA11

Siemens 6ES5-470-8MB11 NSFP 6ES54708MB11

SIEMENS 6ES5-306-7LA11 NSPP 6ES53067LA11

SIEMENS S5 SERIAL INTERFACE 6ES5 521-8MA21

Siemens 6ES5 441-8MA11 6ES54418MA11

SIEMENS 6FC5203-0AF50-3AA1 6FC5 203-0AF50-3AA1 MCP416C

Siemens TP170B 6AV6545-0BB15-2AX0 6AV6 545-0BB15-2AX0 Seal Opened FreeShip

Siemens 6ES5451-8MD11

Jova Solutions TIMS-0102 USB 12C/SPI Interface Module

ZARAK ABACUS BCG 81-01512-02 MODULE w/ ABACUS BRA Circuit Interface

Siemens 6ES7 210-8XX00-6AA0 6ES7210-8XX00-6AA0 PDS210 in Box, Seal opened

Siemens OP17 6AV3617-1JC20-0AX1 Membrane Keypad , ping worldwide

Patriot WA0750

Schneider Modicon AS-B872-002/ASB872002 Output Module OFFERS ACCEPTED

Schneider Modicon AS-5540-006 NSFP AS5540006

Schneider Modicon AS-M680-108 Memory Module

Schneider Modicon AS-9490-004 USPP AS9490004

Schneider Modicon 800 SERIES 11 SLOT RACK AS-H827-103

Schneider Modicon TSX COMPACT DISCRETE INPUT DEP 216 AS-BDEP-216 LOT OF 5

Siemens TI 505-4108 Low VDC Input Module

Telemecanique ATV11HU09M3A 0.37kW Inverter in Box

SIEMENS SIMATIC SM422 DIGITAL OUTPUT MODULE S7-400 ++

SIEMENS 4700 POWER FUNCTIONS METER OPERATOR INTERFACE PANEL 4700-BDRMC3-11HN

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

CC LINK COMMUNICATIONS MODULE MITSUBISHI FR-E5NC

SIEMENS SIMODRIVE 6SN1145-1AA01-0AA1SINUMETIK 840D NCU-BOX 6FC52476FC5357 6SN

SIEMENS Servo Drive 6FC5247-0AA00-0AA3 6FC52470AA000AA3

Advantech PCA-6184V, no ethernet port,

Allen-Bradley 2711-T6C15L1 Panelview 600

ABB 3HNE00313-1

ACCURAY AIC8 086155-001 SCANNER MODULE CARD CONTROLLER B211850

A2LA 17025 Accredited Calibration with full Data Report

82-1/2" OVER ALL LENGTH 2-1/4" DIAMETER BALLSCREW 55" TRAVEL 5-1/2" FLANGE

SIEMENS 6ES7-623-1DE01-0AE3 USPP 6ES76231DE010AE3

ASEA BROWN BOVERI 750191-001B NSFP 750191001B

ALSTOM ALSPA-MV-1013 USPP ALSPAMV1013

MICRO MOTION DL065-S242SU NSPP DL065S242SU

HUB CITY 88 NSFP 88

ALLEN BRADLEY 1774-KA USPP 1774KA

SIEMENS 6ES5-925-3SA11 USPP 6ES59253SA11

Siemens 6ES5-391-5AA13 USPP 6ES53915AA13

SIEMENS 6ES5 454-7LA11 6ES54547LA11

SIEMENS 6ES5 465-7LA13 Module

Siemens PLC 6ES5-451-4UA12/6ES54514UA12 Output

Siemens 6ES7 323-1BH01-0AA0 6ES7323-1BH01-0AA0 FreeShip

Siemens PLC 6ES7 338-4BC01-0AB0 6ES73384BC010AB0 NIB

PVDM3-32 CISCO 32-CHANNEL HIGH-DENSITY VOICE AND VIDEO DSP MODULE

GSM/GPRS Modem Pool 8 Ports USB interface Wavecom Module AT Commands Q2406

Unico 314-739 314739 Interface Module No Box

Siemens 6AV6 640-0DA11-0AX0 Touch Panel NIB

Siemens Logo 230RC 6ED1 052-1FB00-0BA3

MTT ms2304

Schneider Modicon Connector/Cable AS-W801-002/ASW801002

Schneider Modicon 800 SERIES AS-H827-103 11 PORT RACK ASH827103

Schneider Modicon AS-E685-904 USPP ASE685904

Schneider Modicon Gould AS-B804-016 PLC I/O Module

Schneider Modicon AS-B804-116

Schneider Modicon Output Module True High AS-B824-016

Schneider XBTGT5230 Touchscreen Glass

Schneider Modicon TSXPCX3030+ Optical Isolated Cable

SiemensSimatic6AV6641-0CA01-0AX16AV66410CA01

Siemens 6AV6642-0BC01-1AX0 6AV6 642-0BC01-1AX0 SIMATIC TP 177B 6" Touch Panel

SIEMENS SE47.1 6DD1681-0EH1 OPTICAL COUPLER MODULE

GE Fanuc IC697RCM711C 90-70 Redundancy Communication Module IC697RCM711-C

SIEMENS Simodrive Posmo A 1FK6032-2AF1 s/n 22253202 6SN2155-2BD10-1BAO

SIEMENS SINUMERIK 6FC5203-0AF01-0AA0 Membrane Keypad

SIEMENS Moore 63SD Differential Type Flow Controller

Allen-Bradley Panel View 600 Plus

AB 1336S-A030-AN-EN 30HP 240VAC VFD QUANTITY TESTED

ABB/Elmo motor on Irb 4400 Axis 1 #3hac5009-1

A06B-0333-B069#7000 FANUC AC SERVO SPINDLE REMANUFACTURED

75 HP ELECTRIC MOTOR 1200 RPM 405T FRAME TEFC SEVERE CRUSHER DUTY

RELIANCE ELECTRIC 770.91.10 USPP 7709110

ALLEN BRADLEY 2711-K14C10 USPP 2711K14C10

ALLEN BRADLEY 1771-IF05 USPP 1771IF05

HONEYWELL 30731737-006 NSFP 30731737006

WESTINGHOUSE DBL-25-1200 USPP DBL251200

TEXAS INSTRUMENTS PLC VPU500-3104 USPP VPU5003104

GENERAL ELECTRIC DS3800DMEC1D1D USPP DS3800DMEC1D1D

Siemens 6ES5-188-3UA12 PLC Rack 21 Slot

SIEMENS 6ES5 375-0LC31 6ES53750LC31

SIEMENS 6ES5-988-3NA11 USPP 6ES59883NA11

Siemens 6ES5 930-8MD11/6ES5930-8MD11 POWER SUPPLY XLNT

Siemens 6ES5 944-7UB11 in Sealed Box

Siemens Micromaster 430 6SE6430-2UD31-8DA0 18.5KW

RELIANCE ELECTRIC 61C-350 USPP 61C350

Texas Instruments 500-2151

Spirent Adtech AX/4000 401381 L3 Gigabit MM Interface

VIA Artigo A2000 Barebones Storage Server 1.5 GHz VIA C7-D Brand

Siemens C98043-A1604-L3-03 no packaging

Modicon AS-W510-002

Schneider Modicon Automation AS-BDEP-216 Discrete Input -

Schneider Modicon AS-H819-209 CHASSIES ASH819209

Schneider Modicon AS-BDAP-112 USPP ASBDAP112

Schneider Modicon ASB872002 Excellent Analog OUT Module AS-B872-002

Schneider Modicon Automation Output Module DAP 210/AS-BDAP-210

Schneider Modicon AS-W801-006 ASW801006 Extender Cable NIB

Schneider Modicon 140CRA93100 / 140CRA 931 00

SCXI Accelerometer Input Modules NI SCXI-1531

RELEASE SuperMicro X9DRT-F MB ※Check W/ Us for Availability FIRST※

Siemens 6ES7 132-4BD00-0AA0 6ES71324BD000AA0 Output Module

SIEMENS SINUMERIK 840D/DE NCU 572.3 6FC5357-0BB22-0AE0

MODULE COMMUNICATION ALLEN BRADLEY 1203-GD1

SIEMENS SIMODRIVE 611 BOARD 6SN1118-0DJ21-0AA1NIB

SIEMENS SINUMERIK OP 010S 6FC5203-0AF04-0AA0 NIB

SIEMENS Caterpillar D6H / D6H Series II Tractors Service Manual 8KB 4RC 6FC

ALLEN-BRADLEY1756-OFCI/AOUTPUTMODULE1756-0FCI

Allen Bradley SLC 500 Output Module 1746-OX8 Ser. A

ABB ROBOT DSQC345B - RECTIFIER DC1 - 3HAB8101-2

A06B-0128-B575#7076 FANUC SERVO MOTORS REMANUFACTURED

0.1-1250 μm LPA-9Z Desktop Intelligent Laser Particle Size Analyzer Sizer

MODICON AS-M909-001 USPP ASM909001

ALLEN BRADLEY 1398-PDM-150B USPP 1398PDM150B

ADEPT TECH 10332-00500 USPP 1033200500

GE FANUC IC640WMI910 NSFP IC640WMI910

SIEMENS LMXD63B700 NSPP LMXD63B700

SIEMENS 6ES5-928-3UB12 USPP 6ES59283UB12

ALLEN BRADLEY 2755-DD1A-R1 NSFP 2755DD1AR1

Siemens 6ES5 928-3UB21 6ES59283UB21

Siemens SIMATIC 6ES5 926-3SA12

SIEMENS 6ES5-512-5BC12/6ES5512-5BC12 INTERFACE MODULE XLNT

Siemens 6ES5 441-4UA14/6ES54414UA14 Digital Input SEALED OFFERS ACCEPTED

SIEMENS 1FT6105-8SB71-1AA0 3-phase Brushless Servomotor

Siemens EM235 6ES7235-0KD00-0XA0 6ES72350KD000XA0

Schneider Digital Input Block Fuse 140CFB03200 3436

Square D 9006-PBF121

Siemens 6ES7460-0AA01-0AB0 SIMATIC S7-400 IM460-0 Transmitter Interface Module

WE SHIP SAME CISCO SLM2024T SG200-26 SLM2024T-NA 26PORT GIGABIT SMART

Siemens 6RA7018-6DV62-0-Z 6RA7018-6DV62-0 DC DRIVE

Siemens TP27-10 6AV3 627-1QL00-0AX0 Touch Glass, Bergquist Touch Products

Schneider Modicon TSX COMPACT DISCRETE OUTPUT AS-BDAP-210 4

Schneider Modicon ASBDAP210 AS-BDAP-210Compact output

Schneider Modicon AS-B825-016 NSFP ASB825016

Schneider Modicon MODULE AS-E908-131 S35D

Schneider Modicon AS-W192-015

Schneider Modicon AS-BZAE-204 HIGH SPEED COUNTER IN BOX FACTORY SEALED

SCHNEIDER TC2000 OPERATOR INTERFACE 3515 KPM PARTS/REPAIR BROKEN NOB

Siemens 6ES7 131-4BB00-0AA0 Digital Input Module 24 VDC /Un

RSP720-3CXL-GE Cisco Route Switch Processor 720-3CXL Router

SIEMENS D215 USPP D215

SIEMENS Sinumerik 840C 6FC5110-0BA01-1AA0 NC-CPU .

RTI CM-232 Serial Communication Module

SIEMENS 6SN1162-0EB00-0AA0 SIMODRIVE SHIELD CONNECTION PLATE 50MM

SIEMENS 6SC 6101-4A Simodrive Case -NO BOX

SIEMENS 6FC5-111-0CA02-0AA2 USPP 6FC51110CA020AA2

AllenBradley6182H-10TLH4DVersaViewCE1000HWorkstationPanel

Allen Bradley VersaView Display 17" to 19" Repair Service $169.99

ABB E3N-A20 600V 2000A PR112/P-A L/S/I/G INSULATED CASE CIRCUIT BREAKER

Adtech Spirent AX-4000 ATM Testing Solution AX4000

(H2-1) 1 EATON 92-00944-02 POWER SUPPLY H2-1

KENT TAYLOR 6202NZ10000B-1342 USPP 6202NZ10000B1342

ACUITY IMAGING 010-PV9040 USPP 010PV9040

FLUID POWER DIVISION PMC-20T NSFP PMC20T

FANUC A06B-0146-B675 USPP A06B0146B675

SENCON SC7000PLUS NSFP SC7000PLUS

RAYTHEON B34201-00-03-0 USPP B3420100030

REXROTH 3-842-999-903 NSPP 3842999903

Siemens 6ES5 460-7LA11 6ES54607LA11

Siemens 6ES5-928-3UA12 NSFP 6ES59283UA12

SIEMENS 6ES5-430-7LA11 USPP 6ES54307LA11

Siemens 6ES5 490-7LB21 CONNECTOR IN BOX

Siemens S5 6ES5 464-8MC11

SIEMENS 802Dsl Membrane Keypad

SIEMENS 6ES7 223-1BL22-0XA8 EM 223 CN I/O MODULE

Square D 8005 MP-1

Nokia NIF4303FRU 2-Port X.21 PMC Interface Card Module

WS-F6K-DFC3A DIST FWD CARD-3A FOR 65XX 6816 MODULES WITH SUP720

SIEMENS 6ES7-151-1AA03-0AB0

Siemens SCD 1597-ET 6AV8100-1BB00-0AA0

Reliance 45C940

Schneider Modicon GOULD B805 AS-B805-016 INPUT MODULE 115 V AC

Schneider Modicon AS-B352-001 USPP ASB352001

Schneider Modicon AS-S908-021 USPP ASS908021

Schneider Modicon AS-B883-101

Schneider Modicon AS-B807-032 120VAC INPUT

MODICON AS-BDAP-210 DISCRETE OUTPUT MODULE

SIEMENS MODULE DIGITAL INPUT 505-4316A 5054316A

Siemens 6ES5 451-4UA13 -FS- 6ES54514UA13

Siemens PLC Output Module 6ES7 135-4FB01-0AB0 6ES71354FB010AB0 NIB