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DCS系統(tǒng)在工業(yè)生產(chǎn)過程的廣泛應(yīng)用，使可靠性、穩(wěn)定性問題更加突出，也使人們對(duì)整個(gè)系統(tǒng)要求越來越高。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及故障診斷的一般方法。
　　一、DCS系統(tǒng)故障的分類
　　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。
　　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)過程直接聯(lián)系的各種變送器、各種開關(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，這類故障占絕大部分。這類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)帶來的，若設(shè)計(jì)考慮不周，在執(zhí)行中一旦條件滿足就會(huì)引發(fā)故障，造成停機(jī)或死機(jī)等現(xiàn)象。此類故障并不常見。應(yīng)用軟件是用戶自己編定的。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。

Siemens SITOP 6EP1961-3BA20

Siemens 6ES5187-5UA11

HONEYWELL TC-CCR013 302 REDUNDANT NET INTERFACE MODULE PLC 97112972-301 TESTED

Trillium Panther II 90-0472 Fax Interface Module

Wago 750-315 MODBUS FIELDBUS COUPLER

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

Siemens Simatic CPU 224 6ES7-214-1AD22-0XB0

Schneider Modicon AS-B804-116 ASB804116 I/O Module

Schneider Modicon AS-B875-111 Analog Input B877-111 ASB875111

Schneider Modicon AS-521P-007 USPP AS521P007

Schneider Modicon AS-M484-204 USPP ASM484204

Schneider Modicon AS-8535-000 NSPP AS8535000

Schneider Modicon 16 POINT 115V OUTPUT MODULE AS-B804-016 LOT OF 3

Schneider Modicon DEP210/AS-BDEP-210 INPUT MODULE NIB

SIEMENS TI TEXAS INSTRUMENTS 505-4332 INPUT MODULE

Schneider/Telemecanique Inverter ATV312HU15N4 NIB

Siemens SIMULATOR MODULE INPUT/OUTPUT 6ES5-788-8MA11

Siemens 4700-BDRMC3-11HN Power Meter Software Ver 2.3.0.4 White Digital Readout

SIEMENS Sinumerik 840 1P-6FC5103-0AD13-0AA0 1P6FC51030AD130AA0 _ 570-524-9101-00

CISCO WS-SVC-CMM COMMUNICATION MEDIA MODULE

SIEMENS SIMODRIVE 6SN1145-1BA01-0BA1SINUMETIK 840D NCU-BOX 6FC52476FC5357 #2ZP

SIEMENS SIMODRIVE 6SN1145-1AA01-0AA1SINUMETIK 840D NCU-BOX 6FC52476FC5356 [3]

ADVANTECH PCA-6103P2VX Rev.B1

Allen-Bradley 2711-T9C10 ser C rv E 3.15 PanelView 900

ABB 3HAC 5980-1 WRIST COMPLETE 150KG EXCHANGE NO. 6369901-386,

ACCURAY 64829-003 USPP 64829003

A200M5CXXZ1 SIZE5 STARTER 480V COIL

810A16AB ALLEN BRADLEY

SIEMENS 6ES5-948-3UA12 USPP 6ES59483UA12

ASEA BROWN BOVERI 57360001-KG USPP 57360001KG

ALLEN BRADLEY 8600-BP8D USPP 8600BP8D

MEASUREX 05325100 USPP 05325100

HONEYWELL 51304487-150 NSPP 51304487150

ALLEN BRADLEY 150-B24NBDA-J1 NSFP 150B24NBDAJ1

SAFELINE 2813189 FNFP 2813189

Siemens 6ES5-375-1LA61 USPP 6ES53751LA61

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

SIEMENS 135U 6ES5 524 3UA13

Siemens PLC 6ES5-340-3KB42/6ES53403KB42

Siemens 6ES7 314-1AG13-0AB0 6ES7314-1AG13-0AB0 in Box

Siemens PLC 6ES5-421-8MA11 6ES54218MA11 6ES5421-8MA11

PWR-4000-DC 4000W DC POWER SUPPLY FOR CATALYST 6500/7600 1YR - ASK 4 Q

GSM/GPRS Modem Pool 16 Ports USB interface Wavecom Module AT Commands Q2403A

Tripp Lite PS/2 Server Interface Module

Siemens 6AV3627-1QL01-0AX0 LCD Display

Siemens Inverter Card 6SE7 090-0XX84-0FJ0

Modicon SW-DO5T-0TA

Schneider Modicon Discrete Input Relay AS-BDEP-210 ++ ++

Schneider Modicon AS-PRTU-252 AC Pwr Sply Ext Temp ASPRTU252

Schneider Modicon AS-E480-904 USPP ASE480904

Schneider Modicon ASWBXT201 Compact Primary Rack AS-WBXT-201

Schneider Modicon AS-B357-001 ASB357001 N90

Schneider Modicon OUTPUT MODULE AS-B820-000

Schneider TSXMFP032P Mem Card

Schneider Modicon TSX PCU1030 TSXPCU1030 PLC Cable

SiemensSinumerik6FC5403-0AA20-1AA06FC54030AA201AA0

SIEMENS 6DC1-006-1BC/6DC1006-1BC CIRCUIT BOARD NIB

SIEMENS Communication Submodule 6DD1688-0AE0 SS5 SURPLUS - Orig. Box

GE/General Electric Communication Module IC600CB516/B

SIEMENS Simodrive LT Modul 80A 6SN1123-1AA00-0DA0

SIEMENS SINUMERIK 6FC5203-0AF02-0AA0 Membrane Keypad fast shipping

SIEMENS Neptune 500 Gallon Chemical Tank with 4 metering Pumps

Allen-Bradley Panelview 1200 Operator Interface 2711-KC1

5KV 200A INDOOR/OUTDOOR MINI LOAD INTERRUPTER LI SWITCH

ABB YM110001SF BOARD ABB PFVK 105A YM110001-SF

A06B-0315-B201#7008 FANUC SERVO MOTORS REMANUFACTURED

75 HP 364TS ODP ELECTRIC MOTOR 3600 PREMIUM Efficient for HVAC or Compressors

RELIANCE ELECTRIC 57552-D USPP 57552D

ALLEN BRADLEY 20BD125A3NNNANC0 USPP 20BD125A3NNNANC0

ALLEN BRADLEY 1756-L55M12 NSFP 1756L55M12

GRAHAM 85-0200-00 NSPP 85020000

WAUKESHA 015-UI USPP 015UI

TELEMECANIQUE VZ3-IM1500M1207 NSFP VZ3IM1500M1207

GE FANUC IC600CP600 USPP IC600CP600

Siemens 6ES5-182-3KB62 USPP 6ES51823KB62

SIEMENS 6ES5 375-0LA15 6ES53750LA15

SIEMENS 6ES5-956-0AA12/6ES5956-0AA12 POWER SUPPLY NIB

Siemens 6ES5 866-0MC23-0Z USPP 6ES58660MC230Z

Siemens 6ES5 521-8MA22 6ES5521-8MA22

Siemens LOGO! power 6EP1 331-1SH01 6EP1331-1SH01

RELIANCE ELECTRIC I/O PROCESSOR MODULE 45C200A

Texas Instruments 305-35T

Spirent Adtech AX/4000 400323 Utopia Interface

VIPA SLIO Remote IO Starterkit 800-1DK10 -Profibus Cable Connectors ET 200S

Siemens C98043-A1260-L1-11

Modicon AS-W190-200

Schneider Modicon Automation AS-P810-000 ASP810000 Power Supply Module

Schneider Modicon AS BDAU 208 OUTPUT MODULE DAU208 NIB

Schneider Modicon AS-BADU-S9 USPP ASBADUS9

Schneider Modicon AS-B829-116

Schneider Modicon PROGRAMMABLE CONTROLLER PC-F984-385 PROM ID AS-C950-114 1008

Schneider Modicon AS-S911-801 ASS911801 Processor

Schneider Graphic Terminal XBTOT4320

SEALED Allen Bradley 1771-IFE /C 1771-1FE PLC-5 Analog Input Module

RELEASE SuperMicro X9SRE-3F MB ※FULL MFR ※

Siemens 6ES7 135-4FB00-0AB0 Analog Output Module

SIEMENS SINUMERIK 810M 6FC3551-1AC-Z

NM-HD-2VE CISCO 2-SLOT IP COMMUNICATIONS ENH. VOICE/FAX NET. MODULE

SIEMENS SIMODRIVE 611 6SN1123-1AA00-0CA2 POWER MODULE 6SN11231AA000CA2 (NIB)

SIEMENS SINUMERIK OP010 6FC5203-0AF00-0AA0 Membrane Keypad

SIEMENS FACTORY SEALED 6FC5203-0AF53-1AB2 6FC52O3-OAF53-1AB2 SINUMERIK OPERATOR

ALLENBRADLEY1771-0AOUTPUTMODULE8POINT120VAC

ALLEN BRADLEY SLC 500 RELAY OUTPUT MODULE 1746 OW16 SERIES D EXCELLENT CONDITON

ABB PST250-600-70 SOFTSTARTER CAT#1SFA894013R7000 250A 600V 250HP

A02B-0098-B512 Fanuc Series O-TTC Control: Max 4 Axes

0 to 121 dB, 1 dB steps Attenuator OP 001 Type N femal

MODICON AS-C484-264 USPP ASC484264

ALLEN BRADLEY 1395B-69D-1P50 USPP 1395B69D1P50

HEWLETT PACKARD TEST & MEASURE 54111D USPP 54111D

GE FANUC IC600BF841 NSFP IC600BF841

SIEMENS 6SN1130-1DA11-0BA0 NSFP 6SN11301DA110BA0

SIEMENS 6ES5-243-1AA11 USPP 6ES52431AA11

ALLEN BRADLEY 1785-LT3 USPP 1785LT3

Siemens 6ES5 928-3UA21 6ES59283UA21

Siemens SALE 6ES5948-3UR11 6ES5 948-3UR11

SIEMENS 6ES5-490-8FB11 USPP 6ES54908FB11

Siemens 6ES5 431-8MD11/6ES5431-8MD11 INPUT MODULE XLNT

Siemens SIMATIC S5 8 OUTPUTS

Siemens EM 222 6ES7 222-1BF20-0XA0 EM222 PLC

Schneider Modicon 140CRA21110 MB Drop AC Module

Square D 8997 EQ-5210 MCB-10

Siemens 6ES5752-0AA22 Interface Module -V24 60 DAY WARRANTY/FREE

WE SHIP SAME CISCO WS-C3560X-24T-S CATALYST 3560X-24T SWICTH 1 YEAR

Siemens 6MD1021-0AA00 Sicam Digital Input

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

Schneider Modicon TSX Compact AS-BDAU-208 Analog Output

Schneider Modicon AS-BDAP-218 Discreet Output Relay ASBDAP218

Schneider Modicon AS-B820-000 USPP ASB820000

Schneider Modicon TSX Compact AS-BDEA-202 Free Ship

Schneider Modicon AS-P892-000 Remote I/O Processor

Schneider Modicon AS-BDEP-210/ASBDEP210 Input OFFERS ACCEPTED

Schneider Telemecanique XBTGT2220 Opt Interface Panel

SIEMENS 6ES7 134-4FB51-0AB0 INPUT MODULE ANALOG HIGH SPEED +/- 10VD ET2005

S Hp Virtual Conn 8Gb 20port Fibre Chan Mod 572018-B21

SIEMENS Digital Output Module 6ES5456-4UB12 Surplus - Opened Box

SIEMENS SINUMERIK 820 6FC3261-1AC-Z BACKPLA5703749001.51 TESTED WARRANTY

SCHNEIDER TSXSCP114 TSX MICRO COMMUNICATION MODULE

SIEMENS 6SN1161-1CA00-0AA1 18 PIN CABLE

SIEMENS 6SC6-111-2AA00 SIMODRIVE

SIEMENS 6FC5111-0CB02-0AA0 Mixed I/O Module

AllenBradley800MR-NX100BSelectorSwitch2PositionNIBOnly1Left

ALLEN BRADLEY W57 NSPP W57

ABB DSQC211 Power Supply Adaptor Board

ADTEC AX 3000, RF Plasma Generator, Novellus 27-176875-00, very clean

(D7) 1 ALLEN BRADLEY 2711PT10C4D6 OPERATOR INTERFACE (D7)

ITE SIEMENS SLD69400NGT NSFP SLD69400NGT

ACCU SORT AV3700 USPP AV3700

FISHER ROSEMOUNT 36A8448-L5A USPP 36A8448L5A

FANUC A02B-0094-C041 USPP A02B0094C041

ROBERTSHAW DMS-3501 USPP DMS3501

POLYSONICS DCT6088 USPP DCT6088

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-IVN/C LOW TRUE OUTPUT MODULE SERIES C 10-30VDC

ABB ASEA BROWN PC BOARD BUS REPEATER SLAVE DSBC-173 57310001-KH/2 59802

ADEPT Cobra s800 robot

6SE7026-0TP70 SIEMENS COMPACT + MASTERDRIVE 59AMP 30kW 510-620VDC MOTION CTRL P2

HEWLETT PACKARD TEST & MEASURE 8504B USPP 8504B

SYMAX 8020-SCP-631 USPP 8020SCP631

CUTLER HAMMER ND312T36W USPP ND312T36W

CLEVELAND MOTION CONTROL M125-03084 USPP M12503084

NIKKI DENSO NPSA-ZMTA-101AE USPP NPSAZMTA101AE

MITSUBISHI FR-Z220-15KUL-20HP USPP FRZ22015KUL20HP

GE FANUC IC3600EPSB1 USPP IC3600EPSB1

Siemens 6ES5 246-4UA31 6ES52464UA31

Siemens 6ES5-470-8MB11/6ES5470-8MB11 OUTPUT MODULE NIB

SIEMENS 6ES5-306-7LA11 USPP 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