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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(jī)構(gòu)、負(fù)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(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，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，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。

ALLEN-BRADLEY OUTPUT MODULE 1771-OA SERIES B

5N-0

ABB Servo Drive Part# 3HAB8101-13; DSQC 346U

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(H13) 1 RELIANCE 0-51419 PC BOARD H13

80C07B Tektronix 80C07B CR1/F6 2.5GHz Optical Sampling Module CAL/

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WELCH ALLYN VP115 USPP VP115

HONEYWELL STD924-A1A-00000-MB-S2-SV-ZS NSPP STD924A1A00000MB

Siemens 6ES5-243-1AB11/6ES5243-1AB11 INPUT MODULE XLNT

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Siemens 6ES5944-7UB11 in Sealed Box

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Texas Instruments 505-4216A

STACK CABLE MATRIX MODULE

Under valid Lenovo factory until 2015-03-31

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Modicon AS-W911-030

Schneider Modicon Right as Rain by Helen CD Jul-2005 2 Di...

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Schneider Modicon AS-BDAP-210 Discreet Output Relay ASBDAP210

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Schneider Modicon COUNTER INPUT AS-BVIC-224

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Schneider PLC Input Module 140CPS52400

RACAL INSTRUMENTS 1260-14 DIGITAL I/O MODULE

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Allen-BradleyPanelView 1200 Operator Interface 2711-TC1

Allen Bradley SLC 500 1746-OX8 -0X8 Output Module In Box NIB

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0-150kHz Frequency meter 101kHz controler field chanel measurement 32kHz P321M

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SCHNEIDER MODICON TC2000 INDUSTRIAL PC OPERATOR INTERFACE 3515 KPM DISCOLORED

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AllenBradley2711P-RP2A/F2711PRP2F

ALLEN BRADLEY VersaView 1500M OPERATOR INTERFACE DISPLAY 6186-M15AL SER. B

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WS-C3560E-48PD-SF FREE 1 YEAR CISCO WSC3560E48PDSF

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Reliance 84543-133

Schneider Modicon ASS908110 Excellent Remote I/O Processor Module AS-S908-110

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Schneider Modicon AS-W511-002 USPP ASW511002

Schneider Modicon AS-BDAP-218 OUTPUT MODULE 16POINT .5AMP 24-240VAC ISOLATED

Schneider Modicon AS-B824-016 PLC Output Module

MODICON AS-B236-501 ASB236501 MODULE OUTPUT

SIEMENS INPUT MODULE 4POINT DIGITAL 4-PACK MODEL:6ES7-131-4BD01-0AA0

Shuttle X50V3 15.6" Atom D2700 GMA3650 DDR3-1600 Gigabit All-In-One System

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Telemecanique TBX 7 TBX DMS1625 Analog Base with TBXLEP030 Communication Module

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Advantech PCM-9370

ALLEN-BRADLEY 1746-OA8 PLC AC 8 P TRIAC OUTPUT MODULE

ABB BAILEY SYMPHONY CONTROLS DIGITAL IMASI23 ANALOG INPUT SLAVE MODULE 88127

Adept Tech 10330-11350 or 30330-11351 #7625

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

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DYNAMATIC 15-886-3 NSFP 158863

CUTLER HAMMER 7685T-12 NSFP 7685T12

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

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

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LECROY 8901A GPIB INTERFACE CAMAC MODULE

Yaskawa 87820-40200 PLC Module 8782040200 NIB

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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

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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

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BAILEY CONTROLS 6637033A USPP 6637033A

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MODICON 384A USPP 384A

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TOSHIBA B0024FLB2AM USPP B0024FLB2AM

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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

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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

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GE Fanuc CCM IC655CCM500 communication module

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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

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ALLEN BRADLEY 5370-CVIMC USPP 5370CVIMC

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WESTINGHOUSE A206J3MJA-AC NSPP A206J3MJAAC

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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

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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