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DCS系統(tǒng)在工業(yè)生產(chǎn)過(guò)程的廣泛應(yīng)用，使可靠性、穩(wěn)定性問(wèn)題更加突出，也使人們對(duì)整個(gè)系統(tǒng)要求越來(lái)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(lèi)及故障診斷的一般方法。
　　一、DCS系統(tǒng)故障的分類(lèi)
　　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(lèi)。
　　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(guò)程直接聯(lián)系的各種變送器、各種開(kāi)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(lèi)故障占絕大部分。這類(lèi)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(lèi)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(lèi)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(lèi)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(lèi)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(lái)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(lèi)故障并不常見(jiàn)。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(méi)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(jiàn)。

SIEMENS S5 6ES5 308-3UA12 Serial Interface 6ES53UA12

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Siemens 6ES5 942-7UB11 6ES59427UB11

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RME HAMMERFALL HDSP AES-32- PROAUDIOSTAR

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ALLEN BRADLEY VersaView 1200P TOUCH SCREEN OPERATOR INTERFACE 6181P-12TSXPH

ABB INTERRUPTER ASSEMBLY 539D19302 FOR 345KV CIRCUIT BREAKER

Advanced Energy Mercury 10013 Match, P/N 27-256558-00

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MEASUREX 08591501 USPP 08591501

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GE FANUC IC697CSE784 USPP IC697CSE784

FANUC A16B-1210-0030 NSPP A16B12100030

SIEMENS 6AV7-802-0BA02-1AC0 NSFP 6AV78020BA021AC0

RELIANCE ELECTRIC 419437-D USPP 419437D

SIEMENS 6FC5-110-0DB03-0AA2 USPP 6FC51100DB030AA2

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Square D 8030 CC-15

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WS-C3550-12T CISCO SWITCH 10-10/100/1000 PORTS 2 GBIC PORTS: EMI

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Sharp JW-31LM I/O MODULE 32-SLAVE STATIONS 345.6KB 504 POINTS

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SUPPLYNET COMMUNICATIONS TANKLINK 3810 DIGITAL CONTROL CONTROLLER MODULE LLC

SIEMENS 6SN1118-1NH01-0AA1 6SN11181NH010AA1

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ALLEN-BRADLEY 1746-0A16 SLC500 SERIES D OUTPUT MODULE

ABB BAILEY SYMPHONY CONTROLS DIGITAL IMASI23 ANALOG INPUT SLAVE MODULE 88205

ADEPT TECH 10332-00714 USPP 1033200714

(1) 4 Fanuc Motors and (1) Mitubishi Motor

INDRAMAT DDC01.2-N200A-DA02-01-FW USPP DDC012N200ADA020

TELEMECANIQUE LA9-B102 NSFP LA9B102

ELDEC 5250062 USPP 5250062

CUTLER HAMMER A13GN0 USPP A13GN0

PRATT & WHITNEY DU205E USPP DU205E

MODICON AS-B260-001 USPP ASB260001

INDRAMAT IKG0022-22 NSPP IKG002222

Siemens 6ES5 314-3UA11 6ES53143UA11 Free Ship

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SIEMENS 6ES5-374-1FH21 USPP 6ES53741FH21

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Siemens 6ES5-700-8MA11 6ES57008MA11 F294

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Lincoln Electric K336 L6580-1 REM PB Interface Module

Yaskawa 87350-11000 PLC Module 8735011000 XLNT

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Reliance 0-51378-12

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SIEMENS Display 6FC5203-OAB10-0AA0

Advantech Remote Contact/Digital Input ADAM-4053

Allen-Bradley 2711C-T6C Ser B PanelView C600 Color Touchscreen NIB

ABB 64513591 MAIN CIRC. INTERFACE NINT-72C SEALED

Acterna JDSU DSAM-3500B Digital CATV Meter DSAM 3500 w/ Home Cert Secure Sync

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853-012500-003 DETECTOR, EDGE ASSY TYPE

SIEMENS 6SE7-022-7EP70 USPP 6SE70227EP70

BAILEY CONTROLS IMMFP-03 NSPP IMMFP03

ASEA BROWN BOVERI YT204001-FSI1 USPP YT204001FSI1

MODICON AM-R911-000 NSFP AMR911000

INDRAMAT MDD112D-N-020-N2L-130PB0 USPP MDD112DN020N2L11

ASEA BROWN BOVERI YB560103-CH USPP YB560103CH

VIDEO JET 358160-E NSFP 358160E

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SIEMENS 6ES5 700-2LA12 6ES57002LA12

SIEMENS S5 6ES5 377-0AB31 6ES53770AB31 NIOB

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Siemens 6ES7 972-0BB41-0XA0 6ES7972-0BB41-0XA0 NIB

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Siemens LOGO! 6ED1 052-1HB00-0BA6 NIB + LOGO USB Cable

Omron 3G2A9-AL001

Schneider Modicon AS-J878-000 MODEM MODULE ASJ878000

Schneider Modicon PROGRAMMABLE CONTROLLER AS-584L-231 W MEM

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75HP VERTICAL MOTORS, 3600 RPM VSS, TEFC , 230-460V, 365LP

REXROTH 1070070309 NSFP 1070070309

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ALLEN BRADLEY 1756-L62 USPP 1756L62

ALLEN BRADLEY 1336F-BRF150-AA-EN-GMS1 USPP 1336FBRF150AAENG

GENERAL ELECTRIC CR306G002 NSFP CR306G002

SYMAX 8020-SCP-544 NSFP 8020SCP544

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CARRIER HK50AA001 USPP HK50AA001

Siemens 6ES5 948-3UA11 6ES59483UA11

Siemens Simatic S5 6ES5-470-7LB11 Analog Output Module

SIEMENS 6ES5-725-0AK00 NSFP 6ES57250AK00

Siemens 6ES5 491-0LA11 USPP 6ES54910LA11

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SIEMENS LOGO 230RC 6ED1 052-1FB00-0BA1 6ED1052-1FB00-0BA1 #1

S HP 4Gb Virtual Connect Fibre Channel 409513-B21

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SIEMENS 6SE7090-0XX84-0AD1 Card 6SE70900XX840AD1 version 99% , no box

Modicon AS-M84A-001

Schneider Modicon AS-B872-100 ASB872100

Schneider Modicon ASB832016 800 Series Module AS-B832-016

Schneider Modicon AS-B872-002 ASB872-002 Analog 4-20mA Output

Schneider Modicon /Modicon TSX Compact AS-BDAP-217 ASBDAP217

Schneider Modicon DAP 208/AS-BDAP-208

Schneider Modicon AS-J378-000 Modem Assembly / GOULD

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Rigol Digital Color Oscilloscope 60MHz dual CH DS1062CA

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SIEMENS Driver 6SN1118-0DK23-0AA2 (6SN11180DK230AA2)NIB

SIEMENS SINUMERIK 840D/DE NCU 572.2 6FC5357-0BB21-0AE0 NIB

SIEMENS 6FC3988-7AH13 Display Unit

AllenBradley2711E-T10C6PanelView1000ETouchscreenInterfaceRev.D

Allen Bradley Transber Pilot Light 800T-P26