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DCS系統在工業生產過程的廣泛應用，使可靠性、穩定性問題更加突出，也使人們對整個系統要求越來越高。人們希望DCS系統盡量少出故障，又希望DCS系統一旦出現故障，能盡快診斷出故障部位，并盡快修復，使系統重新工作。下面簡單介紹故障大體分類及故障診斷的一般方法。
　　一、DCS系統故障的分類
　　為了便于分析、診斷DCS系統故障發生的部位和產生原因，可以把故障大致分為如下幾類。
　　1、現場儀表設備故障
　　現場儀表設備包括與生產過程直接聯系的各種變送器、各種開關、執行機構、負載等。現場儀表設備發生故障，直接影響DCS系統的控制功能。在目前的DCS控制系統中，這類故障占絕大部分。這類故障一般是由于儀表設備本身的質量和壽命所致。
　　2、系統故障
　　這是影響系統運行的全局性故障。系統故障可分為固定性故障和偶然性故障。這類故障一般比較明顯且影響也是局部的，它們主要是由使用不當或使用時間較長，模板內元件老化所致。
　　3、硬件故障
　　這類故障主要指DCS系統中的模板(特別是I/O模板)損壞造成的故障。這類故障一般比較明顯且影響也是局部的，它們主要是由使用不當或使用時間較長，模板內元件老化所致。
　　4、軟件故障
　　這類故障是軟件本身所包含的錯誤所引起的，軟件故障又可分為系統軟件故障和應用軟件故障。系統軟件是DCS系統帶來的，若設計考慮不周，在執行中一旦條件滿足就會引發故障，造成停機或死機等現象。此類故障并不常見。應用軟件是用戶自己編定的。在實際工程應用中，由于應用軟件工作復雜，工作量大，因此軟件錯誤幾乎難以避免，這就要求在DCS系統調試及試運行中十分認真，及時發現并解決。
　　5、操作、使用不當造成故障
　　在實際運行操作中，有時會出現DCS系統某功能不能使用或某控制不封不能正常工作，但實際上DCS系統并沒有毛病，而是操作人員操作不熟練或操作錯誤所引起的。這對于初次使用DCS系統的操作工較為常見。

SIEMENS S5 6ES5 308-3UA12 Serial Interface 6ES53UA12

Siemens 6ES5 700-8MA11 I/O BUS MODULE IN BOX

Siemens 6ES5 942-7UB11 6ES59427UB11

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

Siemens OP270 6AV6542-0CC10-0AX0 HMI Touchscreen

Siemens 6ES5373-0AA61

Tadiran TL-2300

SIEMENS INTERFACE MODULE 6ES5312-5CA21

F/W REV 3.006 PKG DATE 09/23/2010

Siemens 6SE7032-2FC85-0JA0 / C98043-A1696-L1

Simens HMI 6AV6 648-0AC11-3AX0 6AV66480AC113AX0 6AV6648-0AC11-3AX0 NIB FreeShip

Schneider Modicon AS-BDAP-216N ASBDAP216N DC Output

Schneider Modicon AS-B873-001 ANALOG INPUT MODULE ASB873001

Schneider Modicon AS-B846-002 USPP ASB846002

Schneider Modicon AS-B809-016

Schneider Modicon Board AS-HDTA-200

Schneider Modicon AS-H827-209 HSG PRIM 27 in SYSBUS CHASSIS NIB

Schneider Modicon PanelMate Plus 1000 MM-PM1030SC 92-01686-00

SIEMENS 6ES5 464-8MF21 ANALOG INPUT MODULE

RME HAMMERFALL HDSP AES-32- PROAUDIOSTAR

Siemens Apogee MBC Module PTM6.2Q250-M Digital Output Module

SIEMENS Sinumerik DMP Module Modul 6FC5111-0CA01-0AA0

RELIANCE ELECTRIC 57416-S REMOTE I/O COMMUNICATIONS MODULE 57C416

SIEMENS CONTROLLER CARD 6SN1118-1NH00-0AA2

SIEMENS XVGA box replace monitor to LCD 6FC4600-0AR50 6FC5103-0AB01 SC-1200

SIEMENS 6FC5-110-0BA01-1AA0 NSFP 6FC51100BA011AA0

AllenBradley2711-K9C9PanelView900OperatorInterfaceSeriesCRev.L

ALLEN BRADLEY VersaView 1200P TOUCH SCREEN OPERATOR INTERFACE 6181P-12TSXPH

ABB INTERRUPTER ASSEMBLY 539D19302 FOR 345KV CIRCUIT BREAKER

Advanced Energy Mercury 10013 Match, P/N 27-256558-00

(no #) Cervis Remote Control Unit TM70/1.13 With Cable

MEASUREX 08591501 USPP 08591501

ALLEN BRADLEY 1336E-B040-AE-EN USPP 1336EB040AEEN

GE FANUC IC697CSE784 USPP IC697CSE784

FANUC A16B-1210-0030 NSPP A16B12100030

SIEMENS 6AV7-802-0BA02-1AC0 NSFP 6AV78020BA021AC0

RELIANCE ELECTRIC 419437-D USPP 419437D

SIEMENS 6FC5-110-0DB03-0AA2 USPP 6FC51100DB030AA2

Siemens 6ES5 470-4UC13 6ES54704UC13

Siemens 6ES5-947-3UR21 USPP 6ES59473UR21

SIEMENS 6ES5-440-8MA21/6ES5440-8MA21 OUTPUT MODULE NIB

Siemens 6ES5 923-3UC11 COORDINATOR MODULE NIBBNO

Siemens S5 6ES5-318-8MB13

Siemens C98043-A1203-L23-06

Siemens 6ES5 470-4UC13 -FS- 6ES54704UC13

Square D 8030 CC-15

Omron C500-II002 Expansion Rack Interface Module

WS-C3550-12T CISCO SWITCH 10-10/100/1000 PORTS 2 GBIC PORTS: EMI

Siemens 6ES7316-2AG00-0AB0

Siemens Simovert 6SE7016-1TA61

Remote Display RD-300

Schneider Modicon AS-P120-125 SEALED 125VDC Supply ASP120125

Schneider Modicon AS-B548-000 USPP ASB548000

Schneider Modicon AS-W600-006 NSPP ASW600006

Schneider Modicon AS-BDEP-216 16 Point Input Module

Schneider Modicon AS-B826-032/ASB826032 Output Module OFFERS ACCEPTED

MODICON ANALOG OUTPUT MODULE AS-B872-100

SIEMENS EM221 DI 8XDC24V 6ES7 221-1BF00-0XA0 Digital Input Module

Sharp JW-31LM I/O MODULE 32-SLAVE STATIONS 345.6KB 504 POINTS

Siemens Operator Interface 6SE32900XX878BF0 23884

SIEMENS Sinumerik 6FC3251-1AC-Z 810T Controller

SUPPLYNET COMMUNICATIONS TANKLINK 3810 DIGITAL CONTROL CONTROLLER MODULE LLC

SIEMENS 6SN1118-1NH01-0AA1 6SN11181NH010AA1

SIEMENS Lt-Modul INT. 50A Simodrive 6SN1123-1AA00-0CA0

SIEMENS 6FC5248-0AF20-2AA0 MOUNTING BRACKET

Advantech Remote Data Acquisition Module ADAM-4013 NIB

ALLEN-BRADLEY 1746-0A16 SLC500 SERIES D OUTPUT MODULE

ABB BAILEY SYMPHONY CONTROLS DIGITAL IMASI23 ANALOG INPUT SLAVE MODULE 88205

ADEPT TECH 10332-00714 USPP 1033200714

(1) 4 Fanuc Motors and (1) Mitubishi Motor

INDRAMAT DDC01.2-N200A-DA02-01-FW USPP DDC012N200ADA020

TELEMECANIQUE LA9-B102 NSFP LA9B102

ELDEC 5250062 USPP 5250062

CUTLER HAMMER A13GN0 USPP A13GN0

PRATT & WHITNEY DU205E USPP DU205E

MODICON AS-B260-001 USPP ASB260001

INDRAMAT IKG0022-22 NSPP IKG002222

Siemens 6ES5 314-3UA11 6ES53143UA11 Free Ship

Siemens 6ES5-530-7LA12 NSFP 6ES55307LA12

SIEMENS 6ES5-374-1FH21 USPP 6ES53741FH21

Siemens 6ES5 315-8MA11 INTERFACE MODULE

Siemens 6ES5-700-8MA11 6ES57008MA11 F294

Siemens 6MD1021-0AA00 Sicam Digital Input

Siemens TP270 6AV6545-0CA10-0AX0 Touchscreen Glass

Siemens 6ES5941-7UA12

Lincoln Electric K336 L6580-1 REM PB Interface Module

Yaskawa 87350-11000 PLC Module 8735011000 XLNT

Siemens 6ES7 223-1PH20-0XA0 6ES7223-1PH20-0XA0

Siemens OP37 OP370 6AV3637-7AB16-1AM0 Membrane Keypad

Reliance 0-51378-12

Schneider Modicon AS-B804-116 Output Module 115VAC

Schneider Modicon AS-9003-180 NSFP AS9003180

Schneider Modicon AS-P371-002 NSPP ASP371002

Schneider Modicon AS-B351-001 INPUT MODULE Q1-5

Schneider Modicon AS-884A-101 Processor Module AS884A101 UGC

MODICON TELEMECANIQUE MAGELIS OPERATOR INTERFACE TXB TF024510E BENT METAL

SIEMENS Simatic S7 6ES7 336-1HE00-0AB0 PLC Analog Input Module

Siemens 6ES7 332-5RD00-0AB0 -FS- 6ES73325RD000AB0

Siemens Simatic Output Module TI305-15T

Siemens 9300 9300DC-100-ZZZZA Power Meter Display ION Profibus Access

SIEMENS Sinumerik Module 6FX1120-5BA01 E Stand F & 02

SIEMENS Simodrive 6SN1118-0DM21-0AA0 6SN11180DM210AA0

SIEMENS SIMODRIVE 6SN1123-1AA00-0CA1/0CA0

SIEMENS Display 6FC5203-OAB10-0AA0

Advantech Remote Contact/Digital Input ADAM-4053

Allen-Bradley 2711C-T6C Ser B PanelView C600 Color Touchscreen NIB

ABB 64513591 MAIN CIRC. INTERFACE NINT-72C SEALED

Acterna JDSU DSAM-3500B Digital CATV Meter DSAM 3500 w/ Home Cert Secure Sync

6ES5470-7LA13 SIEMENS Analog Output Module

853-012500-003 DETECTOR, EDGE ASSY TYPE

SIEMENS 6SE7-022-7EP70 USPP 6SE70227EP70

BAILEY CONTROLS IMMFP-03 NSPP IMMFP03

ASEA BROWN BOVERI YT204001-FSI1 USPP YT204001FSI1

MODICON AM-R911-000 NSFP AMR911000

INDRAMAT MDD112D-N-020-N2L-130PB0 USPP MDD112DN020N2L11

ASEA BROWN BOVERI YB560103-CH USPP YB560103CH

VIDEO JET 358160-E NSFP 358160E

Siemens 6ES5-451-4UA12 NSFP 6ES54514UA12

SIEMENS 6ES5 700-2LA12 6ES57002LA12

SIEMENS S5 6ES5 377-0AB31 6ES53770AB31 NIOB

Siemens S5 CONNECTOR 6ES5 490-8MB21 6ES54908MB21

Siemens 6ES7 972-0BB41-0XA0 6ES7972-0BB41-0XA0 NIB

Siemens S7-200 EM231 6ES7 231-0HC20-0XA0 EM 231

Siemens 3TB4012-0B

HONEYWELL TC-CCR012 REDUNDANT NET INTERFACE MODULE

Waters Millipore System Interface Module Detector

Siemens 6ED1 052-2HB00-0BA3 6ED1052-2HB00-0BA3 FreeShip

Siemens LOGO! 6ED1 052-1HB00-0BA6 NIB + LOGO USB Cable

Omron 3G2A9-AL001

Schneider Modicon AS-J878-000 MODEM MODULE ASJ878000

Schneider Modicon PROGRAMMABLE CONTROLLER AS-584L-231 W MEM

Schneider Modicon AS-H827-100 ASH827100 Fast Shipping

Schneider Modicon LOT OF 3 AS-P120-000 POWER SUPPLY MODULES

Schneider Modicon AS-C921-100

Schneider Modicon AS-J890-101 ASJ890101 I/O Processor

Telemecanique MODICON TWDLCAA16DRF

Schneider Telemecanique TM2DRA8RT MODICON PLC

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

Siemens 6AV3627-1QK00-2AX0 6AV3 627-1QK00-2AX0 SIMATIC TP27-6 Touch Panel

SIEMENS Sinumerik 6FC5412-0FA10-0AA0 Impuls Adapt .

FX-232ADP Mitsubishi PLC RS-232 Communication Module FX232ADP

SIEMENS Simodrive UEB - Module Int/Ext. 6SN1112-1AC01-0aa1 SURPLUS

SIEMENS SIMODRIVE 6SN1146-1AB00-0BA1SINUMETIK 840D NCU-BOX 6FC52476FC5356 2NC

SIEMENS 04-07VWTOUAREGKEYLESSREMOTE3D0959753 OFCC:KR55WK45022GERMANYHUF

Allen-Bradley A-B PanelView 1400e Terminal 2711E-K14C6X

AB,ALLEN-BRADLEY BULLETIN GMC DIGITAL SERVO CONTROR 10KW 1394 ,AXIS 10KW,IM

AC Servo Controller AC Main Spindle Drive KDV; KDS; KDA

A06B-0819-B001 FANUC AC SERVO SPINDLE REMANUFACTURED

75HP VERTICAL MOTORS, 3600 RPM VSS, TEFC , 230-460V, 365LP

REXROTH 1070070309 NSFP 1070070309

ALLEN BRADLEY 6170-DCCE1A1EBZZ USPP 6170DCCE1A1EBZZ

ALLEN BRADLEY 2711-B6C20 NSPP 2711B6C20

INDRAMAT MDD112B-N-040-N2L-130PA0 NSPP MDD112BN040N2L13

YASKAWA ELECTRIC SGDH-75AE NSPP SGDH75AE

WHEDCO IMC-3161-2-B NSPP IMC31612B

KAWASAKI 50817-1116R01 USPP 508171116R01

Siemens 6ES5-254-4UB21 USPP 6ES52544UB21

SIEMENS 6ES5 385-8MB11 6ES53858MB11

SIEMENS PLC INPUT MODULE 6ES5 430-7LA12 VER 3

Siemens CABLE CP541 TO S5-CPU S5-135/55 6ES57358BB0

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

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

RELEASE SuperMicro X9SAE MB ※Check W/ Us for Availability FIRST※

Texas Instruments 510-2101

SYMAX Square D 8030 CRM222 8030CRM222 Remote Interface Module Series G

Tyan S8236GM3NR-IL Socket G34 AMD SR5690/SP5100 Chipset EEB Motherboard

Siemens CPU 6ES7 414-3XJ00-0AB0 6ES7414-3XJ00-0AB0

Modicon MA-0212-001

Schneider Modicon /GOULD/AS-884A-101 PROCESSOR 2K W/REMOTE I/O

Schneider Modicon ASB832016 800 Series Module AS-B832-016

Schneider Modicon AS-BDEP-217 USPP ASBDEP217

Schneider Modicon ASBDEP210 8 Pt 120VAC Input Module AS-BDEP-210 Electric

Schneider Modicon -AS-521P-111

Schneider Modicon Discrete Combi - AS-BDAP-220

Schneider Telemecanique ATV58HU90N4 5.5KW 380V FreeShip

Schneider Input Module 8CH 140 ATI 03000 2761

QLogic InfiniBand 12005-PT16 16-Port 40 Gbps QDR Pass-Thru Module for Dell

Siemens 6ES5453-4UA12 6ES5 453-4UA12 SIMATIC S5 453-4 Digital Output Module

SIEMENS 6DD1606-0AD0 6DD16060AD0 Board T400

Mercedes Telephone Communication Module A2038205826

SIEMENS SIMODRIVE 6SN1123-1AA00-0EA1

SIEMENS SINUMERIK 840D/DE NCUBOX 6FC5247-0AA00-0AA2

SIEMENS /MOORE 39ACM24BEN/16139-215 ADVANCED CONTROL MODULE XLNT

Allen-Bradley SLC-500 TRIAC OUTPUT MODULE 85 - 265VAC 50/60Hz 1746-OA16 Ser. B

Allen Bradley SLC 500 1746 OG16 ser. C Output Module

ABB ROBOTICS SERVO MOTOR,PS130/6-200-P-LSS-4101

A06B-0147-B084#7075 FANUC SERVO MOTORS

0-51879-5 PRL GATE AMP PGAF

OKUMA 1006-1216-71-039 USPP 1006121671039

ALLEN BRADLEY 1756-L62 USPP 1756L62

ALLEN BRADLEY 1336F-BRF150-AA-EN-GMS1 USPP 1336FBRF150AAENG

GENERAL ELECTRIC CR306G002 NSFP CR306G002

SYMAX 8020-SCP-544 NSFP 8020SCP544

SIEMENS OP-20/220-5 USPP OP202205

CARRIER HK50AA001 USPP HK50AA001

Siemens 6ES5 948-3UA11 6ES59483UA11

Siemens Simatic S5 6ES5-470-7LB11 Analog Output Module

SIEMENS 6ES5-725-0AK00 NSFP 6ES57250AK00

Siemens 6ES5 491-0LA11 USPP 6ES54910LA11

Siemens 6AV6 640-0DA11-0AX0 6AV66400DA110AX0 FreeShip

SIEMENS LOGO 230RC 6ED1 052-1FB00-0BA1 6ED1052-1FB00-0BA1 #1

S HP 4Gb Virtual Connect Fibre Channel 409513-B21

Telemecanique LA8DN11

SIEMENS S5 6ES5 316-8MA12 IM316 Interface Module

Wago 758-874/000-110 WAGO-I/O-IPC-C6 Linux 2.6 codesys visu

SIEMENS 6SE7090-0XX84-0AD1 Card 6SE70900XX840AD1 version 99% , no box

Modicon AS-M84A-001

Schneider Modicon AS-B872-100 ASB872100

Schneider Modicon ASB832016 800 Series Module AS-B832-016

Schneider Modicon AS-B872-002 ASB872-002 Analog 4-20mA Output

Schneider Modicon /Modicon TSX Compact AS-BDAP-217 ASBDAP217

Schneider Modicon DAP 208/AS-BDAP-208

Schneider Modicon AS-J378-000 Modem Assembly / GOULD

SCHNEIDER ELECTRIC ZB4BW0G31 INDICATOR LED PANEL MNT GREEN 120V

SIEMENS 6ES5 431-8MA11 6ES54318MA11 24VDC Input ModuleXLNT

Rigol Digital Color Oscilloscope 60MHz dual CH DS1062CA

SIEMENS A1-106-101-507/R1-106-101-507 CONTROL BOARD XLNT

SIEMENS Sinumerik I/0-Modul 6FC3984-3RA

RELAIANCE REMOTE I/O COMMUNICATION MODULE 57C416 57C-416

SIEMENS Driver 6SN1118-0DK23-0AA2 (6SN11180DK230AA2)NIB

SIEMENS SINUMERIK 840D/DE NCU 572.2 6FC5357-0BB21-0AE0 NIB

SIEMENS 6FC3988-7AH13 Display Unit

AllenBradley2711E-T10C6PanelView1000ETouchscreenInterfaceRev.D

Allen Bradley Transformer Pilot Light 800T-P26