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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。

Siemens S5 CPU Module 6ES5-944-7UB21 23543

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Spectrum Controls SBAO-1001-11

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WATLOW 97B0-DAAA-00RG TEMPERATURE CONTROLLER 24-28VDC

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(L24) 1 NORTHERN TELECOM QSD43 RECTIFIER MUST SEE L24

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ALLEN BRADLEY 1232X-ENB-27R NSPP 1232XENB27R

GE FANUC 44A391796-G01 USPP 44A391796G01

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ADEPT TECH 10300-15520 NSFP 1030015520

(#2531) Gudel Lineartec CH 4900 Langenthal MLB 15

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ASEA BROWN BOVERI YT212001-BT USPP YT212001BT

ASEA BROWN BOVERI 8R37-1041-31-3101 USPP 8R371041313101

MITSUBISHI MDS-B-CV-150 USPP MDSBCV150

INDRAMAT MAC-112A-0-LD-2-C/130-A-0 NSPP MAC112A0LD2C130A

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TB WOODS 72481G1-C USPP 72481G1C

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Omron 3G2A5-IM212

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Allen-Bradley Flex I/O 1794-1816 24 VDC Sink Input

AB BULLETIN 1397, 150/300HP DRIVE, W/600AMP BREAKER, MOTOR STARTER, FUSES, ETC..

AC Motor Inverter - 30 HP - 480 Volt - Three Phase Input

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750' 6/3 SO SOOW SJO SJOOW Portable Cord Cable Wire 600V Outdoor Flexible

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ALLEN BRADLEY 503345 NSPP 503345

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Texas Instruments 500-5892

SQUARE DS48891 MDGF/SGR INTERFACE MODULE NIB

Under valid Lenovo factory until 2015-03-31

Siemens Connector 6ES7 392-1AJ00-0AA0 NIB

Modicon AS-W911-006

Schneider Modicon Right As Rain Helen Good

Schneider Modicon AEG/GOULD/MODICON/ AS-B570-001 OUTPUT MODULE XLNT

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Schneider Modicon AS-BDAP-210 Discreet Output Relay ASBDAP210

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Schneider MODICON TXBTF024411F TXB TF024411F

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RAD DXC-30 MULTIPLEXER FULLY LOADED DIGITAL T3 T1 CROSS CONNECTION

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MITSUBISHI COMMUNICATION MODULE AJ71-UC24

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Allen Bradley SLC 500 1746-OX8 -0X8 Output Module Sealed Box NIFSB

ABB Robot, ABB 1400 robot, Welding robot, ABB S4C controls system, Fanuc Robot,

A06B-0143-B184 FANUC SERVO MOTORS REMANUFACTURED

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MOTOMAN ROBOTICS USAFED-09-YR21 NSFP USAFED09YR21

ALLEN BRADLEY 1747-L543P NSFP 1747L543P

ALLEN BRADLEY 1336-B005-EAD-FA2-S1 NSPP 1336B005EADFA

GENERAL ELECTRIC 3VWHS553CD06 USPP 3VWHS553CD06

SQUARE D MHP36600 NSFP MHP36600

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ASEA BROWN BOVERI SPR-SK19591-7 NSPP SPRSK195917

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SERIES C CAT REV G01 REV F01 F/W B

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