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DCS系統(tǒng)在工業(yè)生產(chǎn)過(guò)程的廣泛應(yīng)用，使可靠性、穩(wěn)定性問(wèn)題更加突出，也使人們對(duì)整個(gè)系統(tǒng)要求越來(lái)越高。人們希望DCS系統(tǒng)盡量少出故障，又希望DCS系統(tǒng)一旦出現(xiàn)故障，能盡快診斷出故障部位，并盡快修復(fù)，使系統(tǒng)重新工作。下面簡(jiǎn)單介紹故障大體分類(lèi)及故障診斷的一般方法。
　　一、DCS系統(tǒng)故障的分類(lèi)
　　為了便于分析、診斷DCS系統(tǒng)故障發(fā)生的部位和產(chǎn)生原因，可以把故障大致分為如下幾類(lèi)。
　　1、現(xiàn)場(chǎng)儀表設(shè)備故障
　　現(xiàn)場(chǎng)儀表設(shè)備包括與生產(chǎn)過(guò)程直接聯(lián)系的各種變送器、各種開(kāi)關(guān)、執(zhí)行機(jī)構(gòu)、負(fù)載等?，F(xiàn)場(chǎng)儀表設(shè)備發(fā)生故障，直接影響DCS系統(tǒng)的控制功能。在目前的DCS控制系統(tǒng)中，這類(lèi)故障占絕大部分。這類(lèi)故障一般是由于儀表設(shè)備本身的質(zhì)量和壽命所致。
　　2、系統(tǒng)故障
　　這是影響系統(tǒng)運(yùn)行的全局性故障。系統(tǒng)故障可分為固定性故障和偶然性故障。這類(lèi)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(dāng)或使用時(shí)間較長(zhǎng)，模板內(nèi)元件老化所致。
　　3、硬件故障
　　這類(lèi)故障主要指DCS系統(tǒng)中的模板(特別是I/O模板)損壞造成的故障。這類(lèi)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(dāng)或使用時(shí)間較長(zhǎng)，模板內(nèi)元件老化所致。
　　4、軟件故障
　　這類(lèi)故障是軟件本身所包含的錯(cuò)誤所引起的，軟件故障又可分為系統(tǒng)軟件故障和應(yīng)用軟件故障。系統(tǒng)軟件是DCS系統(tǒng)帶來(lái)的，若設(shè)計(jì)考慮不周，在執(zhí)行中一旦條件滿(mǎn)足就會(huì)引發(fā)故障，造成停機(jī)或死機(jī)等現(xiàn)象。此類(lèi)故障并不常見(jiàn)。應(yīng)用軟件是用戶(hù)自己編定的。在實(shí)際工程應(yīng)用中，由于應(yīng)用軟件工作復(fù)雜，工作量大，因此軟件錯(cuò)誤幾乎難以避免，這就要求在DCS系統(tǒng)調(diào)試及試運(yùn)行中十分認(rèn)真，及時(shí)發(fā)現(xiàn)并解決。
　　5、操作、使用不當(dāng)造成故障
　　在實(shí)際運(yùn)行操作中，有時(shí)會(huì)出現(xiàn)DCS系統(tǒng)某功能不能使用或某控制不封不能正常工作，但實(shí)際上DCS系統(tǒng)并沒(méi)有毛病，而是操作人員操作不熟練或操作錯(cuò)誤所引起的。這對(duì)于初次使用DCS系統(tǒng)的操作工較為常見(jiàn)。

SIEMENS /MOORE 39ACM24BBN 040/4M APACS CONTROL MODULE 16139-96/4

AC SERVO DRIVER PANASONIC MSD011A1X ping

ALLEN-BRADLEY 700-P800A-1 RELAY 8NO 120VAC 10AMP XLNT

Allen Bradley SLC 500 Digital Output Module 1746-OA8

ACCURAY QA-3-017948-003 USPP QA3017948003

A06B-0153-B077#7076 FANUC SERVO MOTORS REMANUFACTURED

(000 BACK) Cutler Hammer 400A Disconnect DH365NGK 600V 4Wire Fusible NEMA1

INDRAMAT 2AD100D-B050B1-AS03-B2N1 USPP 2AD100DB050B1AS0

TELEMECANIQUE ATS-46C32N USPP ATS46C32N

DYNAMATIC 15-886-3 NSFP 158863

CUTLER HAMMER 7685T-12 NSFP 7685T12

PERFORMANCE TECHNOLOGY CPC396 USPP CPC396

MODICON AS-521P-004 NSPP AS521P004

HONEYWELL 4DP7APXOA-211 USPP 4DP7APXOA211

Siemens 6ES5 310-3AB11 6ES53103AB11

Siemens 6ES5-526-3LA21/6ES5526-3LA21 COMMUNICATION PROCESSOR XLNT

SIEMENS 6ES5-373-0AA61/6ES5373-0AA61 MEMORY MODULE EPROM XLNT

Siemens 6ES5 267-8MA11 Stepper Motor Modul IP 267 Good Condition

Siemens 6ES5-460-7LA13 Analog Input 6ES54607LA13 N948

SIEMENS 6GK7-343-1GX11-0XE0 6GK73431GX110XE0 FreeShip

Siemens TP27 6AV3627-1NK00-2AX0 in Box

Siemens 6ES5926-3SA11

LECROY 8901A GPIB INTERFACE CAMAC MODULE

Yaskawa 87820-40200 PLC Module 8782040200 NIB

Siemens 6ES7 223-1BL21-0XA0 6ES7223-1BL21-0XA0 FreeShip

Siemens OP37 6AV3637-1LL00-0AX1 Membrane Keypad

Reliance 0-48673-1

Schneider Modicon AS-B806-032 120V Output 800 IO ASB806032 Point

Schneider Modicon AS-884A-211 USPP AS884A211

Schneider Modicon AS-P190-112 USPP ASP190112

Schneider Modicon AS-B258-101

Schneider Modicon AS-8533-004 18 PIN Connector

Modicon TSX Discrete Output Module DAP210 / AS-BDAP-210

SIEMENS SIMATIC S7 INPUT MODULE 6ES7 321-1EL00-0AA0 6ES7321-1EL00-0AA0

TELEMECANIQUE XBTGT2220 Touchscreen Glass

Siemens Simatic Relay Output Module 505-4916 5054916

Siemens 9510 9510DC-1156-GZZA NIB Power Meter Display ION Ethernet Access

SIEMENS Sinumerik Interface Card 6FX1121-2BB02 E Stand J & 07

SIEMENS 6SN1123-1AB00-0BA1 6SN11231AB000BA1 SimoDrive

SIEMENS SIMODRIVE 6SN1123-1AA00-0JA0

SIEMENS ENCODER 6FC9320-3KA00

Advantech PCM-7310 Single Board Computer

ALLEN-BRADLEY 2711E-T14CB PANELVIEW 1400E

ABB 60HP AC DRIVE CAT#ACS800-U1-0060-5+D150+L503

Acterna ANT-20SE OC-192 STM-64 JDSU ANT-10Gig in Carrying Case 60 days

6AV2181-4JB00-0AX0 Starter Kit SIMATIC HMI Comfort TP900

8520-CRTC1 ALLEN BRADLEY MONITORS CRT REMANUFACTURED

SIEMENS 6SE3-225-5DJ40 USPP 6SE32255DJ40

BAILEY CONTROLS 6637033A USPP 6637033A

ASEA BROWN BOVERI S6HQ800BWAS4 NSPP S6HQ800BWAS4

MODICON 384A USPP 384A

INDRAMAT MDD090C-N-020-N2M-110PB1 USPP MDD090CN020N2M12

ASEA BROWN BOVERI DSQC-239 USPP DSQC239

TOSHIBA B0024FLB2AM USPP B0024FLB2AM

Siemens 6ES5-445-3AA12 USPP 6ES54453AA12

SIEMENS 6ES5 605-0UA11 6ES56050UA11

SIEMENS S5 6ES5 330-8MA11 6ES53308MA11

Siemens S5 6ES5 955-3LC14 6ES5955 6ES595553LC14

Siemens 6ES7 972-0AA1-0XA0 6ES7972-0AA1-0XA0

Siemens S7 400 CPU 6ES7 414-2XG03-0AB0 6ES74142XG030AB0

Siemens 305-55T

HONEYWELL INTERFACE MODULE Q7230A 1005 NO BOX

WARRANTY460V AC 3-Ph Input 75A Out Series B

Siemens 6DS1603-8RR 6DS16038RR

Siemens LOGO! 24 PLC 6ED1052-1CA00-0BA0 NIB

Omron 3G2A5-RM001E

Schneider Modicon AS-M680-108 ASM680108

Schneider Modicon MODULE AS-B275-501 INPUT S43A

Schneider Modicon AS-H819-209 USPP ASH819209

Schneider Modicon Groupe // AS-W808-002 warranty

Schneider Modicon AS-BDEP-216

Schneider Modicon REMOTE I/O PROCESSOR MODULE AS-S908-110

Telemecanique LA-DT4C Time Delay Module

Schneider TELEMECANIQUE PLC TSXDET824 in Box

SIEMENS/TI CVU100/2588958-0001 OPERATOR INTERFACE XLNT

Siemens 6AV6 542-0AD15-2AX0 MP270 Simatic Multi Panel

SIEMENS Sinumerik 6FC5203-0AF00-0AA0 Operator Panel

GE Fanuc CCM IC655CCM500 communication module

SIEMENS v6SN1121-0BA11-0AA1 SIMODRIVE - -

SIEMENS Sinumeric 6FC5203-0AE00-0AA0 tested warranty

SIEMENS ACROMAG/SIEMENS/MOORE 15669-32-5/15669-1-14 PROM XLNT

Allen-Bradley Cat. 1771-0AD 12 - 120V AC Output Module

ab smc plus ALLEN BRADLEY 150-A135NBD SERIES B SMART MOTOR CONTROLLER

AC Motor Speed Control VFD - 30 HP - 600 Volt - Three Phase Input

A06B-0754-B200#3001 FANUC AC SERVO SPINDLE REMANUFACTURED

750T45HPM SQ D Transber 750KVA 3PH 12470/480V

RELIANCE ELECTRIC UGZ3455 USPP UGZ3455

ALLEN BRADLEY 5370-CVIMC USPP 5370CVIMC

ALLEN BRADLEY 2364-SPE12A NSFP 2364SPE12A

INDRAMAT MAC112C-1-HD-3-C/130-A-0/S005 USPP MAC112C1HD3C130A

YASKAWA ELECTRIC DDSCR-GL70H3 USPP DDSCRGL70H3

WESTINGHOUSE A206J3MJA-AC NSPP A206J3MJAAC

INTERMATIC UG30A2403D USPP UG30A2403D

Siemens 6ES5-247-4UA31 NSFP 6ES52474UA31

SIEMENS 6ES5 377-0AB21 6ES53770AB21

SIEMENS OP-393 II 6ES5 393-0UA12 OP393 6ES5393-0UA12

Siemens BOARD 6ES5-410-0AA12 6ES5 410 0AA12 6ES54100AA12 SIEMEN

Siemens 6ES7 151-1AA04-0AB0 6ES7151-1AA04-0AB0 FreeShip

Siemens OP Program Cable 6XV1440-2KH32

RELIANCE 0-57405-E O-57405-E I/O PLC MODULE ANALOG DCS HD-400X36-TUFR MODULE -

Texas Instruments 505-4908

SUNPAK INTERFACE MODULE HA-1D FOR USE WITH HASSELBLAD 503CX 500ELX CAMERAS

TYAN TRANSPORT VX50 B4985 Thunder n4250QE S4985 OPTERON Barebone B4985V50V4H-4P

Siemens CP5613 Card 6GK1561-3AA01 , opened box,

Modicon DI-1135-000

Schneider Modicon /Schneider AS-BDAP-218 TSX Compact DAP 218 Discrete Output module 8x24

Schneider Modicon ASB803008 115VAC Input Module AS-B803-008

Schneider Modicon AS-BDEP-214 USPP ASBDEP214

Schneider Modicon AS-BDAP-220 Discreet Input/Output Combination Module ASBDAP220

Schneider Modicon -AS-516P-002

Schneider Modicon DEP 216/ AS-BDEP-216

Schneider Telemecanique Analog Output Module TM2AMO1HT

Schneider Modicon AS-BDEP-216/DEP 216 Discrete Input Module

QLogic SANbox2-64 modular Fibre channel fabric switch 64 ports

SIEMENS 6ES5454-4UA11 SIMATIC OUTPUT MODULE 16PT QUANTITY

SIEMENS 3RG7834-6DD00 LS4-4 LASER SCANNER

METSO U4440123 V1.1 MAKA PCB ASSLY COMMUNICATION I CONTROL MODULE F4310209 48568

SIEMENS Simodrive 6SN1123-1AA00-0AA1 6SN11231AA000AA1

SIEMENS SINUMERIK 840DE 6FC5357-0BB11-0AE0 NCU 571.2

SIEMENS /MOORE 39PSMNAN APACS PSM MODULE 16013-1/2ME

ALLEN-BRADLEY VERSAVIEW 1500P CAT 6181P15NS2KH/B

ALLEN BRADLEY SLC 500 1746-OA16 OUTPUT MODULE

ABB ROBOTICS DSQC 317 3HAB2220-1 MEMORY MODULE EXPANSION BOARD 6MB 77484

A06B-0147-B077#7008 FANUC SERVO MOTORS REMANUFACTURED

03400 SIEMENS TYP 03400-A NR.340884 GE.548 184.0001.00 (SINUMERIK 3T)-AT DUBAI

NACHI RAX23C USPP RAX23C

ALLEN BRADLEY 1756-L60M03SE NSPP 1756L60M03SE

ALLEN BRADLEY 1336-C005-EAD USPP 1336C005EAD

GENERAL ELECTRIC 6VAF554 USPP 6VAF554

STEARNS 1081011A2FBF USPP 1081011A2FBF

SIEMENS 6SE9-216-8CB40 NSFP 6SE92168CB40

BARBER COLMAN 80BE-00044-212-V-00 USPP 80BE00044212V00

Siemens 6ES5 945-7UA21

Siemens SIMATIC S5 6ES5 945-7UA13

SIEMENS 6ES5-712-8BC50 NSFP 6ES57128BC50

Siemens 6ES5 490-8MA12 NSFP 6ES54908MA12

Siemens 6AV6 542-0AG10-0XA0 6AV6542-0AG10-0XA0 MP270B

Siemens K-TP178 6AV6 640-0DA11-0AX0 Protective Film

SALE AMD FX6100 6 Core 3.3G 8G500G 120G SSD HD7750/1G Gaming/Business PC

Telemecanique ATV31H075N4A

SIEMENS INTERFACE MODULE DUAL LOCAL LINE NETWORK 505-7339 SEALED 5057339

Wago ETHERNET 750-880 Starter Kit 2.0 51262278 ETHERNET-STARTERKIT 2.0

Siemens 6SE7038-6GL84-1BG2 6SE7 038-6GL84-1BG2 6SE70386GL841BG2 NIB

Modicon AS-M484-104

Schneider Modicon AS-BDAP-209

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

Schneider Modicon AS-B863-001 USPP ASB863001

Schneider Modicon AS-BDEP-209 ASBDEP209 8 AC Input

Schneider Modicon Card Module NUL 200/AS-BNU1-200

Schneider Modicon AS-HDTA-200/ASHDTA200 Primary rack OFFERS

Schneider Modicon MM-PM15-401 MMPM15401 MMPMMP003C

SIEMENS 6ES5 463-4UB12 ANALOG INPUT MODULE

RIS TM-2482-P13-000-P2-00-RE-00 TEMPERATURE MONITOR 117

SIEMENS AA17-E001G-A USPP AA17E001GA

SIEMENS Sinumerik FBG Module 6FX1126-5AA01 E Stand C

Reliance Electric 0-57404-1E 0574041E Network Communications Module Repaired

SIEMENS Drive 6SN1112-1AB00-0AA1

SIEMENS SUN SG-XL8500-SDLT6FC SDLT600 FC Tape Drive SL8500

SIEMENS 6FC4600-1AS01 Free Ship

AllenBradley2711-K10G16/C2711K10G16Panelview

Allen Bradley Versa View 1500H 6189-RDT15CA 2711P-RN6 6182-15TEH6B

ABB IRB 1400 SER 14-20050 ROBOT S4C PLUS CNTRLR TEACH PENDANT W/ MATCHED SET

Advanced Energy RFPP RF10S 7520709010

(O1-10) 1 G&L MOTION CONTROL M.1302.1226 SERVO MOTOR O1-10

MEASUREX 09437700 USPP 09437700

ALLEN BRADLEY 1336E-BX040-AN-EN-L9E USPP 1336EBX040ANENL9

GE FANUC IC752WTD802 USPP IC752WTD802

FANUC A16B-1211-0150 NSPP A16B12110150

SIEMENS 6DL3-100-8AC USPP 6DL31008AC

RELIANCE ELECTRIC 45C-37B NSFP 45C37B

SIEMENS 6GK7-343-1HX00-0XE0 USPP 6GK73431HX000XE0

Siemens 6ES5 470-7LA12 6ES54707LA12

Siemens 6ES5-948-3UA21 USPP 6ES59483UA21

SIEMENS 6ES5-441-4UA13 NSFP 6ES54414UA13

Siemens 6ES5 942-7UB11 6ES5942-7UB11 115U CPU 942

Siemens S5 6ES5-431-8MD11 6ES54318MD11 Input Module

SIEMENS C98043-A1600-L1 SIMOREG CONTROL BOARD In Box

Siemens 6ES5 465-4UA13 6ES54654UA13

Square D 8030 CC-30

OMRON C500-IP004-E PERIPHERAL INTERFACE MODULE

WS-C2960S-24TS-L CISCO 2960S-24TS SWICTH W/1 YR -WSC2960S24TSL Fast Sh

SIEMENS 6ES7-322-1HH00-0AA0 6ES73221HH000AA0

SIEMENS SINUMERIK 6FC5203-0AF00-0AA0 Membrane Keypad

Saftronics CIMR-G3U21P5

Schneider Modicon AS-P120-000ASP120000

Schneider Modicon AS-B552-000 NSPP ASB552000

Schneider Modicon AS-W801-002 NSPP ASW801002

Schneider Modicon AS-BDEP-218 Discrete Input Mod.

Schneider Modicon AS-B827-032 24 VDC Input ASB827032

MODICON AEG PANELMATE PLUS OPERATOR INTERFACE MM-PMC2-200 PARTS OR REPAIR

SIEMENS Digital Input Module 6ES5436-4UA12 NIB Box Opened to Meke Pictures

SFP-GE-Z CISCO GENUINE 1000BASE-ZX GIGABIT ETHERNET SFP DOM

Siemens OP-393 II C 6ES5 393-0UA13 OP393 6ES5393-0UA13 OP 393-II C

SIEMENS Sinumerik 6FC5110-0DB01-0AA1 E.Stand J CPU Interface Module

Standard Communications TVM450 TV Modulator refurbished

SIEMENS 6SN1122-0BA12-0AA0 Drive Logic Section

SIEMENS Circuit Board 6SC6300-0FE01 SIMODRIVE

SIEMENS 6FC5247-0AF11-0AA0 6FC5 247-0AF11-0AA0 Direct Control Key Module

Advantech RS-422/485 Isolated Repeater ADAM-4510S

ALLEN-BRADLEY 1734-OA2 120/230 Vac 2 Channel Output Module IN BOX

ABB BAILEY SYMPHONY CONTROLS DIGITAL IMASI23 ANALOG INPUT SLAVE MODULE 88228

ADEPT TECH 10332-11400 NSPP 1033211400

(1000 pcs) x DS4E-S-DC5V PANASONIC/ AROMAT RELAY

INDRAMAT DDS02.1-W050-DA01-00 USPP DDS021W050DA0102

TELEMECANIQUE TSX-P474-25 USPP TSXP47425

ENDRESS & HAUSER 83F08-CFUDAANAB3AE NSFP 83F08CFUDAANAB3A

CUTLER HAMMER CPS160220YAH USPP CPS160220YAH

QUALITROL IDM-LSU-MKII NSPP IDMLSUMKII

MODICON AS-P451-522 USPP ASP451522

INDRAMAT PLCB02-02-FW USPP PLCB0202FW

Siemens 6ES5 318-8MB11 6ES53188MB11

Siemens 6ES5-535-3MA12 NSFP 6ES55353MA12

SIEMENS 6ES5-374-1KH21/6ES5374-1KH21 256K MEMORY MODULE XLNT

Siemens 6ES5 318-8MA12 S5 Interface Module

Siemens 6GK1-143-0AB01/6GK11430AB01 Comm Module NICE OFFERS ACCEPTED

Siemens 6RA24 C98043-A1605-L1-5-7 Board

Siemens TP270 LCD Display for 6AV6545-0CC10-0AX0

Siemens 6ES5951-7LB14

LOT 2 Allen Bradley 1492-IFM20D120N INTERFACE MODULE

Yamaha O2R96 VCM Digital Mixer

Siemens 6ES7 223-1PL00-0XA0 6ES7223-1PL00-0XA0 in Box Seal Opened

SIEMENS OP7 6AV3 607-1JC20-0AX0

Reliance 0-51811-1

Schneider Modicon AS-B802-008/ASB802008