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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。

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

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LENZE EVS9326-ES USPP EVS9326ES

YAMATAKE 80360146-011 USPP 80360146011

RELIANCE ELECTRIC 0-51890-3 USPP 0518903

Siemens 6ES5 456-7LA11 DIGITAL OUTPUT

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Square D 8003 CP-32

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

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

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Reliance 45C344

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

Schneider Modicon AS-B350-001 USPP ASB350001

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

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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

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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

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

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

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Patriot WA0750

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

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Schneider Modicon AS-M680-108 Memory Module

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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

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CC LINK COMMUNICATIONS MODULE MITSUBISHI FR-E5NC

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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

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SIEMENS 6ES5 454-7LA11 6ES54547LA11

SIEMENS 6ES5 465-7LA13 Module

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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

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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

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

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

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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

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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※

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MODULE COMMUNICATION ALLEN BRADLEY 1203-GD1

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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

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ADEPT TECH 10332-00500 USPP 1033200500

GE FANUC IC640WMI910 NSFP IC640WMI910

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ALLEN BRADLEY 2755-DD1A-R1 NSFP 2755DD1AR1

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

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

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Schneider Digital Input Block Fuse 140CFB03200 3436

Square D 9006-PBF121

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

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

Schneider Modicon ASBDAP210 AS-BDAP-210Compact output

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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

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

RTI CM-232 Serial Communication Module

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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

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ACUITY IMAGING 010-PV9040 USPP 010PV9040

FLUID POWER DIVISION PMC-20T NSFP PMC20T

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SENCON SC7000PLUS NSFP SC7000PLUS

RAYTHEON B34201-00-03-0 USPP B3420100030

REXROTH 3-842-999-903 NSPP 3842999903

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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

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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