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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，也使人們對整個系統(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)場儀表設(shè)備故障
　　現(xiàn)場儀表設(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)行機構(gòu)、負載等?，F(xiàn)場儀表設(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或使用時間較長，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或使用時間較長，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)計考慮不周，在執(zhí)行中一旦條件滿足就會引發(fā)故障，造成停機或死機等現(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，因此軟件錯誤幾乎難以避免，這就要求在DCS系統(tǒng)調(diào)試及試運行中十分認真，及時發(fā)現(xiàn)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(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誤所引起的。這對于初次使用DCS系統(tǒng)的操作工較為常見。

Ziatech ZT8908 CPU 133 MHz Pentium 4Mb Flash 32 Mb DRAM with SVGA PCI Mezzanine

A06B-6102-H206#H520 FANUC CONTROLLERS REMANUFACTURED

75 HP ELECTRIC MOTOR 1200 RPM 405T FRAME NEMA PREMIUM EFFICIENT SEVERE DUTY

MITSUBISHI FR-A740-75K NSFP FRA74075K1

SIEMENS 1FT6132-6SF71-4TA0 NSFP 1FT61326SF714TA0

ALLEN BRADLEY 1775-SR5 NSFP 1775SR5

FANUC A06B-6059-H215 USPP A06B6059H215

GE FANUC IC600CP210 USPP IC600CP210

MODICON AS-C384-204 USPP ASC384204

ITE SIEMENS HJD63B300L NSFP HJD63B300L

CANDY CONTROLS DIFF-1 NSFP DIFF1

Siemens NIB S5 6ES5 927-3SA11 6ES59273SA11

Siemens 6ES5-456-4UA12/6ES5456-4UA12 DIGITAL OUTPUT MODULE NIB

SIEMENS 6ES5 752-0AA43 -FS- 6ES57520AA43

SIEMENS S5 6ES5 464-8MA21 -50mv analog b

Siemens S5-115U 942 CPU 6ES5 942-7UA13

Siemens 6ES7214-2AD23-0XB0 in Box, Seal Opened,

Siemens Simatic 6ES5300-5CA11 IM300 6ES5 300-5CA11

Siemens 505-6660

Hp 81531A Optical head interface module

WIPOTEC CAN I/O 16 INTERFACE MODULE PROFIBUS PD2006

Siemens 6ES5 375-0LD31 6ES53750LD31 Memory

Siemens LOGO! PLC 12/24RCo 6ED1 052-2MD00-0BA2

Omron C200H-ID216

Schneider Modicon AS-H827-100 Gould Secondary Housing ASH827100

Schneider Modicon AS-B356-001 24VDC Output Module

Schneider Modicon AS-J212-001 USPP ASJ212001

Schneider Modicon MODICON/ DEP-218/AS-BDEP-218 16POINT INPUT MODULE NNB

Schneider Modicon AS-MEEP-000 MEMORY MODULE ASMEEP000

Schneider Modicon TSX COMPACT M AS-BDAP-218 ~NIB Sur.~

SMC Solenoid Valve Manifold SMC EX250 Si Device Net 8 EX250 Input Modules

Schneider Telemecanique XBT NU400 XBTNU400

SIEMENS TI 505-4816 110-220VAC OUTPUT MODULE LNC

Siemens 6AV3 545-0CC10-0AX0 6AV3 5450CC100AX0 Panel

SIEMENS Sinumerik 6FX1122-1AC02. Coupling PLC/NC .

ESI CKA 63116 timer/communications module

SIEMENS Simodrive Part# 6SN1123-1AA00-0HA0 W/ Card

SIEMENS SIMODRIVE 6SN1145-1BA02-0BA1SINUMETIK 840D NCU-BOX 6FC52476FC53562ZM

Allen-Bradley 800T-B6 30.5mm Type 4/13 Push Button Red

ABB 15 VHK-500 Vacuum Circuit Breaker

ACC, MATRIX CARD, HIGH DENSITY, 6X16, 3730 2074757

A06B-6058-H334 FANUC SERVO AMPLIFIER REMANUFACTURED

80 HorsePower Phasemaster Automatic Rotary Phase Converter Type MA-A

SICK OPTIC ELECTRONIC DME2000-000S01 NSFP DME2000000S01

ALLEN BRADLEY 803-N899-739/1 NSPP 803N8997391

ALLEN BRADLEY 501587 NSPP 501587

IQ AUTOMATION FK150SDRFDCSG USPP FK150SDRFDCSG

GENERAL ELECTRIC DS3800HRRB1B1A USPP DS3800HRRB1B1A

YASKAWA ELECTRIC CACR-IR-05SFB NSPP CACRIR05SFB

MITSUBISHI A1SJ71QE71-B2 NSFP A1SJ71QE71B2

Siemens 6ES5-305-7LB11 USPP 6ES53057LB11

SIEMENS 6ES5 430-4UA13 DIGITAL INPUT MODULE

SIEMENS S5 6ES5 430-4UA13 DIGITAL INPUT MODULE /BOX

Siemens Digital Input Module 6ES5 430-7LA12 33421

Siemens 6ES7 216-2AD23-0XB0 6ES7216-2AD23-0XB0 in Box, Seal Opened, FreeShip

SIEMENS OP270 6AV6 542-0CA10-0AX1 Display Panel in Box

RELEASE SuperMicro X9DBL-3F MB ※Check W/ Us for Availability FIRST※

Texas Instruments 5TI-3100

TELLABS 5310Z T1 INTERFACE MODULE

TSXDSY32T2K Modicon Premium Output TSX-DSY-32T2K

SIEMENS DDC Controller 549-210

Modicon MM-PMC2-200

Schneider Modicon ELECTRIC AS-BDAP-210

Schneider Modicon ASBADU214 BRAND Compact Analog Input AS-BADU-214

Schneider Modicon AS-BSIM-216 USPP ASBSIM216

Schneider Modicon ASH810208 PERFECT 800 Series Rack AS-H810-208

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

Schneider Modicon I/O Module AS-BDAP-209

SCHNEIDER Telemecanique Switch XB4 BVB4

Schneider Automation Inc 140 DDI 353 00 140DDI35300 Input Module

PWR-3845-AC CISCO 3845 AC POWER SUPPLY

SIEMENS 6ES5-441-8MA11 PLC OUTPUT MODULE ""

SIEMENS 6DD1-641-0AC0 NSPP 6DD16410AC0

LAWN 100-RSL Lawn 100RSL Communication Module - Without Power Cord -

SIEMENS SimoDrive 6SN1130-1AA11-0BA0 _ 6SN 1130-1AA11

SIEMENS SINUMERIK 840C NC CPU 6FC5110-0BB01-0AA2

SIEMENS Moore VIM Voltage Input Module APACS 39VIMCCN

ALLEN-BRADLEY SLC 500 1746-OB16 C OUTPUT MODULE QTY

Allen Bradley Remote I/O Communications Module 2706-PRIOP

ABB SACE PR231/P W/ BK15494 P4KLAM0400B OUT OF

A06B-0148-B175#7000 FANUC SERVO MOTORS REMANUFACTURED

7 Exxus TECH RR-P3-8 9/23 Conflat Tee with two 2-3/4" & one 41/2" flanges

PANASONIC YB-020UDD USPP YB020UDD

ALLEN BRADLEY 1772-PLC-2 USPP 1772PLC2

ALLEN BRADLEY 1336S-B010-EOD-SERV USPP 1336SB010EODSERV

GENERAL ELECTRIC DS3800DGRC1B1C USPP DS3800DGRC1B1C

TELEMECANIQUE ATV-66D33-N4 USPP ATV66D33N4

SQUARE D LI36400 NSPP LI36400

CUTLER HAMMER C363UV200JT NSFP C363UV200JT

Siemens 6ES5 951-7ND11 6ES59517ND11

SIEMENS 16X24VDC Digital Output Module 6ES5 454-7LA11

SIEMENS 6ES5-752-0AA43 NSFP 6ES57520AA43

Siemens 6ES5 498-1AA61 NSFP 6ES54981AA61

Siemens 6AV6642-0DC01-1AX0 OP177B Membrane Keypad

SIEMENS LOGO 6ED1 055-1FB00-0BA0

Roland V-SYNTHGT

Telemecanique TSX17ACC8

Siemens Simatic 6ES7 151-1AB00-0AB0 Interface Module Profibus in Box

Wago 750-474 2-CHANNEL ANALOG INPUT MODULE 4-20 mA SINGLE ENDED

Siemens 6SL3255-0AA00-4BA1 6SL32550AA004BA1 G110 BOP

Modicon AS-P810-001

Schneider Modicon DISCRETE VDC/VAC OUTPUT DAP 218/AS-BDAP-218

Schneider Modicon ASB231 ASB237001 Input Module AS-B237-001

Schneider Modicon AS-B875-011 NSFP ASB875011

Schneider Modicon DTA 201/AS-HDTA-201 Secondary Subrack

Schneider Modicon GOULD AS-P453-621 REMOTE I/O MODULE

Schneider Modicon AS-J892-001 Remote I/O Processor

SCHNEIDER AUTOMATION PM 1000 MODBUS PLUS INTERFACE NNB

SIEMENS 505-4332 INPUT MODULE 5054332

Reliance Electric Drive Digital I/O Module O-57401-2

Siemens 6SN1118-0DG23-0AA0

SIEMENS SINUMERIK OP 032S 6FC5203-0AB20-1AA0

ProSoft MVI56 Communications Module MVI56-BAS

SIEMENS POSMO 6SN2703-3AA10-0BA1 6SN2 703

SIEMENS SIMODRIVE 6SN1145-1BA01-0BA1SINUMETIK 840D 6FC5247-0AA00-0AA26SN1123

SIEMENS 6FC3521-0AC-Z USPP 6FC35210ACZ

AllenBradley2706-B41J16DatalinerInterface

Allen Bradley Terminal Board 9101-1779 Amphenol Connector /Sealed

ABB K - Line K-600S 600V 600A LS AIR CIRCUIT BREAKER

ZEISS CMM WEST GERMANY MC850 COORDINATES MEASURING MACHINE

(SIEMENS)[flowmeter]7ML5004-1AA10-3B good in condition for industry use

MITSUBISHI FR-Z240-30K-UL USPP FRZ24030KUL

ALLEN BRADLEY 1336VT-B060-EAS-L3 USPP 1336VTB060EASL3

GENERAL ELECTRIC 745-W3-P5-G5-HI-A-E NSFP 745W3P5G5HIAE

FLEXMATE INC SD0018-G03 USPP SD0018G03

SIEMENS 6ES5-928-3UA11 USPP 6ES59283UA11

REXROTH PPC-R02.2N-N-L2-T2-NN-FW USPP PPCR022NNL2T2NNF

TOTAL CONTROL PRODUCTS GCK-DEM-S02 USPP GCKDEMS02

Siemens 6ES5 524-3UA15 6ES55243UA15

Siemens 6GK1143-0AA01 6GK11430AA01 w/ Eprom

SIEMENS 6ES5-451-8MR12 USPP 6ES54518MR12

Siemens 6ES5 375-0LA15 USPP 6ES53750LA15

Siemens S5 EEPROM 2 KB 6ES5-375-0LC11

Siemens CABLE 6ES7901-0BF00-0AA0

Siemens 6ES5 420-4UA12 -FS- 6ES54204UA12

Square D 8030 DOM-221

SCHNEIDER TELEMECANIQUE OTB1EODM9LP ETHERNET INTERFACE MODULE FREE SHIP

WIPOTEC CAN-I/O-16 USPP CANIO16

Siemens 6ES7953-8LM20-0AA0 4MB MMC

Siemens TP170A 6AV6 545-0BA15-2AX0 Touch Glass

Sick WSU26-120

Schneider Modicon AS-E908-131 MEMORY MODULE ASE908131

Schneider Modicon AS-B573-010 NSFP ASB573010

Schneider Modicon Controller AS-J892-101

Schneider Modicon AS-HBOX-201 3 1/2 " DISKETTE STORAGE BOX

Schneider Modicon AS-B846-002 Analog Mux Current Module SEALED D11 817

Modicon 1646-4 Computer Interface Modem

SIEMENS 6ES7331-7PF11-0AB0 SIMATIC S7 ANALOG INPUT MODULE 6ES73317PF110AB0

Schneider Modicon 140CPU43412A 140 CPU 434 12A TSX Quantum

SIEMENS LZSRT78725 FNFP LZSRT78725

SIEMENS Sinumerik 6FX1120-2CA02 Memory Module Card

Siemens Remote Communications Module Hicom 300 E

SIEMENS 6SN1123-1AA00-0HA1 SIMODRIVE MODULE 6SN1118-0AA11-0AA1

SIEMENS 6SN1123-1AAOO-OAA2 6SN11231AAOOOAA2 SIMODRIVE LT MODULE

SIEMENS 6FC5210-0DA20-1AA0 6FC5 210-0DA20-1AA0 SINUMERIK 840D MMC 103 Version B

Allen-BradleySLC500OutputModule1746-OB16

Allen-Bradley - 2711P-T7C4D1 - NO BOX

ABB CIRCUIT BREAKER S5H400MW-2S4W

ADEPT TECH 90400-11140/XY-HRS-140AH404 USPP 9040011140XYHRS1

(4667) Square D Control Card 52011-038-54 125-25 Constant 4667

INDRAMAT MAC-112B-0-GD-3-C/130-A-0 USPP MAC112B0GD3C1301

TOSHIBA VT130G2U5270 NSFP VT130G2U5270

FANUC A06B-6044-H026 USPP A06B6044H026

DANFOSS 176F0544 NSFP 176F0544

RELIANCE ELECTRIC 419437-D NSFP 419437D

NACHI MFM352H1V USPP MFM352H1V

MEASUREX 05348200 USPP 05348200

Siemens 6ES5 380-7AA11 6ES53807AA11

Siemens 6ES5-752-0LA52 NSFP 6ES57520LA52

SIEMENS 6ES5-376-1AA11 NSFP 6ES53761AA11

Siemens 6ES5 385-8MB11 High Speed Counter Module 25/500KHZ

Siemens PILTZ PN0Z16 2S safty relay. Ident. Nr: 774066

Siemens 6SE7014-OTP50-Z NIB

Siemens TP7 6AV3607-1NH00-0AX0 Touch Panel in Box

Siemens 6SC6100-0AB00

Micros 400354 Peripheral Interface Module

XENPAK-10GB-LR- 10GBASE-LR XENPAK MODULE FOR CISCO

Siemens 6ES7 314-6CG03-0AB0 6ES73146CG030AB0 NIB

Siemens PLC 6ES7 222-1HF22-0XA0 6ES72221HF220XA0 NIB

Reliance 0-52712-11

Schneider Modicon AS-9492-001 PLC

Schneider Modicon AS-B225-001 NSFP ASB225001

Schneider Modicon AS-P800-003 NSFP ASP800003

Schneider Modicon AS-B805-016 115VAC Input Module

Schneider Modicon AS-B278

Modicon Panelmate Plus MM-PM10-300 Working

Siemens Simatic Input Module PLC 505-4332

Siemens 6ES7 322-1BP00-0AA0 -FS- 6ES73221BP000AA0

Siemens Simatic 6ES5458-4UA12 Output Module QB20

SIEMENS 6DD1640-0AB0 USPP 6DD16400AB0

SIEMENS Sinumerik System 880M 6FC3492AC-Z

SIEMENS OFFER & WIN SIMODRIVE 6SN1145-1BA01-0BA1

SIEMENS Simodrive 6SC9811-4BC20 TAKE-OUT

SIEMENS Circuit Board 6FC9310-1MB01 _ 6FC93101MB01 _ DO-L1348-1A01

ADLINK Technology ND-6017 NIB 8-CH Analog Input FreShip

ALLEN-BRADLEY 1778-OYC CONTACT OUTPUT MODULE BULLETIN

ABB ACS 600 Inverter Drive ACS601-0100-4-000B1700801 3AUA489999N546 100 HP VFD

Actus Power AC Servo Controller NPA-20NN-50-E8 USPP NPSA20NN50E8 Pak 1-PH/3PH

6ES7317-6FF00-0AB0 6ES7317-6FF03-0AB0 Brand , Factory Sealed,

90 5 right of refusal, no reserve

SIEMENS R15E02A186 USPP R15E02A186

BOSCH 1070077920-100 USPP 1070077920100

BAILEY CONTROLS IMSED-01 USPP IMSED01

MODICON AS-P890-300 NSPP ASP890300

KEARNEY & TRECKER 1-21976-00 USPP 12197600

CONTROL TECHNIQUES UNI-1402 USPP UNI1402

Siemens 6ES5 095-8MA05 6ES50958MA05

Siemens 6ES5-458-7LB11 FNFP 6ES54587LB11

SIEMENS 6ES5 816-0AA11 6ES58160AA11

SIEMENS S5 6ES5 470-8MA12 ANALOG OUTPUT

Siemens S5Input Module 6ES5921-3WB14 E Stand F & 05

Siemens 6ES7231-0HC22-0XA0 6ES72310HC220XA0

SIEMENS SIMATIC PANEL PC 870 PC870 6AV7705-2BC00-0AD0 Membrane Keypad

Siemens 6ES5095-8MA02

HP Agilent 70907B External Mixer Interface Module EMIM

X10 CK18A Firecracker Computer Interface Kit IN BOX

Siemens 6ES5 926-3KA12 6ES5926-3KA12

Siemens LOGO! TD text display 6ED1 055-4MH00-0BA0 NIB

Omron C200HW-BC051

Schneider Modicon AS-BMOT-201/ASBMOT201

Schneider Modicon ANALOG OUTPUT MODULE AS-B872-100

Schneider Modicon AS-J474-000 USPP ASJ474000

Schneider Modicon 984 Series 11-Slot Rack AS-9536-000 AS-H827-209 WARRANTY