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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(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。現(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。這對于初次使用DCS系統(tǒng)的操作工較為常見。

Siemens 6ES7 331-7SF00-0AB0 SIMATIC SM 331 ANALOG INPUT

Square D 8005 FCB-10

Schneider Electric TSXFPCG010 Interface Module FIP/PCMCIA

Wago 750-644 Bluetooth I/O Module

Siemens LOGO! 6ED1 052-1CC00-0BA6 NIB ping Worldwide

Modicon AS-W607-012

Reliance 0-52806-1

Schneider Modicon AS-884A-311/AS884A311 CPU Controller OFFERS ACCEPTED

Schneider Modicon AS-B225-001 NSPP ASB225001

Schneider Modicon AS-P800-003 USPP ASP800003

Schneider Modicon AS-B805-016 800 I/O 115V IN 16PT ASB805016

Schneider Modicon AS-B279

MODICON PANELMATE PLUS INDUSTRIAL COMPUTER OPERATOR INTERFACE MM-PMA2400C

SIEMENS SIMATIC INPUT MODULE 6ES5465-3AA13 NICE T/O M/O

Siemens 6ES7 322-1BL00-0AA0 -FS- 6ES73221BL000AA0

Siemens Simatic 6ES5458-4UA12 Output Module QB20

SIEMENS 6DD1640-0AC0 EM11 I/O MODULE

SIEMENS Sinumerik Tape Reader. 6FC 3984-1FD

SIEMENS OFFER & WIN SIMODRIVE 6SN1145-1BA01-0BA1 SIMODRIVE 6SN1123-1AA00-0CA1

SIEMENS SimoDrive 6SC6901-2AA00-Z 6SC _ 6901-2AA00-Z

SIEMENS Circuit Board 1P-6FC5110-0BB04-0AA1 Version D _ 1P6FC51100BB040AA1

ADVANTECH 16-Channel Digital Input Module ADAM-5051

ALLEN-BRADLEY 1778-OYC CONTACT OUTPUT MODULE BULLETIN

ABB ACS 600 INVERTER UNIT AC DRIVE 64184466 84A AMP ACN6340070500000 71270

Actus Power AC Servo Controller NPSA-102MU-E9BS USPP NPSA102MUE9BS Pak 3PH 220V

6ES7317-6TJ10-0AB0 6ES7317-6TK13-0AB0 Brand , Factory Sealed,

90 - Configurations Vary Please See Auction

SIEMENS S2-48255-B-001 USPP S248255B001

BOSCH 1070077958-200 USPP 1070077958200

BAILEY CONTROLS IMSET-01 USPP IMSET01

MODICON AS-P890-300 USPP ASP890300

KEITHLEY 26600-3 NSPP 266003

CONTROL TECHNIQUES UNI-1403 USPP UNI1403

Siemens 6ES5 095-8MA05 6ES50958MA05

Siemens 6ES5-460-4UA12 USPP 6ES54604UA12

SIEMENS 6ES5 816-0AA11 Memory Module 816-OAA11 XLNT

SIEMENS S5 6ES5 470-8MC11 6ES54708MC11

Siemens S5Interface Module 6ES5314-3UR11

Siemens 6ES7231-7PD21-0XB0 6ES72317PD210XB0

SIEMENS SIMATIC PANEL PC 870 PC870 6AV7743-2AC00-0AA0 Membrane Keypad

Siemens 6ES5095-8MA03

HP Agilent E1482B 7500 Series C VXI-MXI Interface Module

X10 FireCracker CK18A Wireless Computer Interface Kit

Siemens 6ES5 927-3KA13 6ES5927-3KA13

Siemens LOGO! TD text display 6ED1055-4MH00-0BA0 in Box

Omron C28K-CDT1-A

Schneider Modicon AS-BMOT-201/ASBMOT201

Schneider Modicon Analog Output Module AS-B872-200 ASB872200

Schneider Modicon AS-J475-000 NSFP ASJ475000

Schneider Modicon 984 Series Rack with Cards P830 B801 B872 B875-111

Schneider Modicon DAP208/AS-BDAP-208

Schneider Modicon /AEG/Schneider AS-BDAU-202/ASBDAU202

SLC500 AC Input Module AB 1746-IA16/C

Schneider Telemecanique XBT-R400 XBTR400

SIEMENS TEXAS INSTRUMENTS TI 305-01T OUTPUT MODULE RELAY 8-POINT PLC - w/WA

SIEMENS 5SX21A62106-6 USPP 5SX21A621066

SIEMENS Sinumerik 6FX1145-3BA00 Servo Encoder Module

DSC Communications TC221 ADPCM Transcoder Module 300-2208-901

SIEMENS SIMODRIVE LT MODULE 6SN1123-1AA00-0BA1 25A

SIEMENS SIMODRIVE 6SN1145-1BA01-0BA1SINUMETIK 840D NCU-BOX 6FC52476FC5357 2ZP

ADlink PROX-H471

Allen-Bradley 8000 MBA Module 905981-05 Rev A

ABB 2668 180-524/1 DSMB133 MEMORY MODULE BOARD CARD 62645

ACCU SORT AV4000 USPP AV4000

A06B-6066-H223 FANUC SERVO AMPLIFIER REMANUFACTURED

800 main amp panelboard panel 480v 277v 700 600 breaker volt hcm square d 65 spa

SIEMENS 6AA5103-0AC70 USPP 6AA51030AC70

ALLEN BRADLEY 8520-3S5A-BAT-EX4-Y-1-4 USPP 85203S5ABATEX4Y1

ALLEN BRADLEY 6180-ADDDEDAZCZZ USPP 6180ADDDEDAZCZZ

JOHNSON CONTROLS NU-XRL101-0 USPP NUXRL1010

GENERAL ELECTRIC DS3800NGRA1L1E USPP DS3800NGRA1L1E

YASKAWA ELECTRIC DDSCR-GL60S3 USPP DDSCRGL60S3

MODICON AS-P933-000 NSFP ASP933000

Siemens 6ES5-312-3AB12 NSPP 6ES53123AB12

SIEMENS 6ES5 431-2BA11 6ES54312BA11

SIEMENS S5 6ES5 464-8MD11 6ES5464-8MD11 Analog Input 4x 20mA

Siemens EPROM 6ES5375-0LA21 6ES5 375-0LA21

SIEMENS 6ES7 222-1HF32-0XA0 6ES7222-1HF32-0XA0 FreeShip

Siemens OP37 6AV3 637-1LL00-0AX1 Membrane Keypad

RADISYS EXM18-RS422 USPP EXM18RS422

GE FANUC PRINTER INTERFACE MODULE MODEL IC610PER151D

TEXAS INSTRUMENTS 500-5039 TIWAY NETWORK INTERFACE MODULE 5005039

Siemens 12/24RC 6ED1 052-1MD00-0BA6 NIB +LOGO PC RS232 Cable

Siemens EM231 6ES7 231-7PD21-0XA0 6ES7231-7PD21-0XA0

Modicon PA-0254-000

Schneider Modicon Remote I/O Processor AS-P451-622 2976

Schneider Modicon AS-BDAU-202 /Schneider FACORY SEALED Analog Out ASBDAU202

Schneider Modicon AS-C484-063 USPP ASC484063

Schneider Modicon AS-J146-000 MODULE

Schneider Modicon 984 Compact PLC Motion Module AS-BMOT-202

Schneider Modicon Input Module M AS-BDEP-210 ~ SURPLUS~ Qty. x2

Schneider Telemecanique TSXP57203M

SCHNEIDER 170ADM39030 24VDC 10POINT INPUT MODULE NIB

PVDM3-256 CISCO 256-CHANNEL HIGH-DENSITY VOICE AND VIDEO DSP MODULE

SIEMENS 6ES5-441-4UA12/6ES5441-4UA12 OUTPUT MODULE XLNT

SIEMENS 6DD1681-0AE1 CONNECTOR MODULE SE4.1

Invacare MKIV Module Communication COM34/AUX34 - 1086241 -

SIEMENS SIMODRIVE 6SN1145-1AA01-0AA1SINUMETIK 840D NCU-BOX 6FC52476FC5356 #BBA

SIEMENS Sinumerik 840C CRT MONITOR 6FC5103-0AB13-0AA2

SIEMENS MOORE PRODUCTS 15854-62 BCG LIG BOARD ASSEMBLY NNB

ALLEN-BRADLEY POWERFLEX 70

5250-LP1 ALLEN BRADLEY PLC MODULES REMANUFACTURED

ABB SAMC II POW 57171847, , 57171847,

A06B-0148-B184#7000 FANUC SERVO MOTORS REMANUFACTURED

700 HP FUJI FR700F1S-4U Variable Frequency Inverter 380-480 V 840 Amps

PERCEPTRON 912-0013 USPP 9120013

ALLEN BRADLEY 1775-S5 NSPP 1775S5

ALLEN BRADLEY 1336S-BRF75-AE-EN3 NSPP 1336SBRF75AEEN3

GENERAL ELECTRIC DS3800HSQD1E1B USPP DS3800HSQD1E1B

TEXAS INSTRUMENTS PLC 505-ATM-0440 NSPP 505ATM0440

STI 70084-1095 NSFP 700841095

DIAMOND ELECTRONICS 514557-1047 USPP 5145571047

Siemens 6ES5 955-3LF11 6ES59553LF11

SIEMENS 6ES5 102-8MA01 6ES51028MA01

SIEMENS 6ES5-777-0BC00 USPP 6ES57770BC00

Siemens 6ES5 700-2LA11 Slot Rack

Siemens 6DD1660-0AH1 CS51

Siemens LOGO! 12/24RCo 6ED1052-2MD00-0BA6 IN BOX

Rockwell Automation SCR Scaling Bridge Module SD3000 Plus SD3K-SCLR400 97324971

Telemecanique TSXDSF635

SIEMENS SS1 Hybrid Interface Module 20 mA IN BOX

Wago 750-460/000-005 4-CHANNEL ANALOG INPUT MODULE

Siemens 7SJ6005-4EA00-1DA0/BB Overcurrent Protection

Modicon AS-S902-071

Schneider Modicon DAU202 AS-BDAU-202 TSX COMPACT INPUT MODULE 65

Schneider Modicon AEG/GOULD// AS-W190-025 CABLE 25FT XLNT

Schneider Modicon AS-B875-111 NICE

Schneider Modicon AS-584L-231

Schneider Modicon INTERBUS MASTER AS-BBKF-201 ASBBKF201

Schneider Modicon AS-M84A-002

Schneider Automation Inc 140 DRC 830 00 140DRC83000 Output Module

SIEMENS 505-4216A INPUT MODULE 5054216A

RELIANCE ELECTRIC 57C-433 USPP 57C433

Siemens 6FC3251-1AC-Z Sinumerik 810-T Machine Operator Interface WOW

SIEMENS SINUMERIK PCU 50 6FC5210-0DF20-0AA0

PLC DIRECT DATA COMMUNICATION MODULE CATD4-DCM

SIEMENS Servo Drive 6SN111-0AA00-0BAG

SIEMENS TERMINAL BLOCK 840C 6FC5111-0CA73-0AA1 WOW

SIEMENS 6FC 9302-2AB MODULE 6FC9302-2AB

ALLENBRADLEY1794-0A8IOUTPUTMODULE17940A8IFACTORYSEALED

ALLEN BRADLEY Solid State Timer Relay 700-RTC20100U1 WARRANTY

ABB MAGNET SERVO MOTOR T6C4BR1209

ZINSCO 13945 500 kVa 4160 208Y/120 60HZ 3P transformer

(V20) 1 NIB RELIANCE ELECTRIC 50FR4042 50HP 460VAC DRIVE V20

MODICON 140-CPU-424-02 NSFP 140CPU42402

ALLEN BRADLEY 1391B-ESAA22-AQB USPP 1391BESAA22AQB

GENERAL ELECTRIC DS3815PMMA1C1B USPP DS3815PMMA1C1B

FOXBORO 202S-10-SSNSSSNSSN USPP 202S10SSNSSSNSSN

SIEMENS 6ES7-643-6CA01-3JX0 USPP 6ES76436CA013JX0

SCANALINE A3052076 USPP A3052076

WESTINGHOUSE 88PC-119 USPP 88PC119

Siemens 6ES5 530-7LA12 -- 6ES55307LA12

Siemens DIGITAL OUTPUT 6ES5 451-7LA11

SIEMENS 6ES5-454-4UA14 NSPP 6ES54544UA14

Siemens 6ES5 385-8MB11/6ES5385-8MB11 HIGH SPEED COUNTER XLNT

Siemens S5 Memory Module 6ES5340-3KB21 E Stand 3

Siemens Control Board C98043-A1304-L Simodrive

SIEMENS / TI 505-4616 DISCRETE OUTPUT MODULE

Square D 8030 HOM-211

Send us your best offer90 Day warranty on all parts

WE SHIP SAME WS-CAC-4000W 4000 WATT AC POWER SUPPLY FOR US CABLE ATTACHED

Siemens 6fc5503-0ac00-0aa0 802S

Siemens TP170B 6AV6545-0BC15-2AX0 Touch Glass worldwide

Schneider Modicon Telemecanique SQUARE D AS-I Motor Starter

Schneider Modicon AS-BMOT-202 Compact Motion Encoder ASBMOT202

Schneider Modicon AS-B680-101 USPP ASB680101

Schneider Modicon Programmable Controller AS-584A-440

Schneider Modicon AS-J810-000 Gould 584 to 800 I/O Interface Assy Assembly ASJ810000

Schneider Modicon AS-B872-100 Analog Current Output

MODICON - EATON - IDT - PANELMATE - BOARD P/N 42-13900

Siemens 6ES7-221-1BF22-0XA0 Input Module 24VDC

Schneider 140DAI54300 Input Module

Siemens HMI 6AV6 648-0AC11-3AX06AV66480AC113AX0/

SIEMENS Sinumerik 6FX1125-8AC01 CPU Module.

SIEMENS CBP COMMUNICATION MODULE 6SE7090-0XX84-0FF0

SIEMENS 6SN1123-1AB00-0CA1 LT-Module Int.2X50a Version A 6SN11231AB000CA1

SIEMENS 6SN1123-1AA00-0CA0 Simodrive

SIEMENS 6FC5-203-0AE00-0AA0 USPP 6FC52030AE000AA0

AllenBradleyPanelviewPlusLogicModule2711P-T7C4D1/A2711PT7C4D1

Allen-Bradley - 1794-TB3S

ABB DCS 400 DCS401.0230 230-500VDC 230A 140HP DRIVE TESTED

Adept Technology 10154-70200 PCA SFG Board

(5731) Bently Nevada Transducer Velocity Control Velomitor 330750-80 (5731)

INDRAMAT MDD-112C-N-030-N2M-130PB0 USPP MDD112CN030N2M1A

USON CORP VECTOR-6U NSFP VECTOR6U

FANUC A06B-6055-H108 USPP A06B6055H108

DVT 540M USPP 540M

RELIANCE ELECTRIC 57C-435A USPP 57C435A

NEMATRON CORP ICC420-52210 USPP ICC42052210

MITSUBISHI HCSFS352B USPP HCSFS352B

Siemens 6ES5 415-7AB21 6ES54157AB21

Siemens 6ES5-788-8MA11 NSFP 6ES57888MA11

SIEMENS 6ES5-377-0AB21 USPP 6ES53770AB21

Siemens 6ES5 421-8MA12 S5 DIGITAL INPUT MODULE

Siemens S5 6ES5 im306 7la11 IM306

SIEMENS 6SE7031-7HF84-1HH1 in Box

Siemens USB-PPI Cable USBPPI PC-PPI USB Version NIB

Siemens 6se9211-10aa0

Mitel 9400-300-301-NA Fiber Interface Module

WS-X6748-GE-TX Cisco Exp. Forw.720 Interface Module Switch 48 ports ma

Siemens 6ES7 331-7PF10-0AB0 6ES7331-7PF10-0AB0 in box

Siemens PLC CPU 221 6ES7 211-0AA21-0XB0 CPU221 FreeShip

Reliance 0-54394-1

Schneider Modicon AEG AC Power Converter AS-P120-000

Schneider Modicon AS-B232-501 NSPP ASB232501

Schneider Modicon AS-P890-000 USPP ASP890000

Schneider Modicon AS-B807-132 INPUT MODULE 800I/O 115VAC 32PT

Schneider Modicon AS-B360-001 Relay Output Module ASB360001

Modicon Panelmate II W/ Datapack M/N MM-PMC2-100

Siemens Simatic 6ES7-331-1KF01-OABO Analog Input Module

SIEMENS 6ES7 138-4FA00-0AB0 DISTRIBUTED I/O MODULE ET200S PROFISAFE QUANTITY

Siemens Simatic 505-4816 110/220 AC Output Module

SIEMENS 6DD1660-0AH1 CS51 Free Ship

SIEMENS A388185 SINUMERIK SCREEN KIT NIB

SIEMENS 6SN1-111-0AA00-0BA1 NSFP 6SN11110AA000BA1

SIEMENS SIMODRIVE 6SC6101-3B-Z 6SC6101 - 3B - Z

SIEMENS 802S 6FC5500-0AA00-1AA0 Membrane Keypad 6FC5 500-0AA00-1AA0

Advantech AIMB-742VE Main Board

ALLEN-BRADLEY 1771-OWNA CONTACT OUTPUT MODULE 32pt

ABB ACS550 ACS550-U1-038A-4+B055 20 Hp, 25 Hp, ACS550, VFD, N12

ACTUS POWER NPSA-20NN-50E8 USPP NPSA20NN50E8

6ES7417-4XL04-0AB0 Brand , Factory Sealed,

900 ITE IT8502E/JX-L JXA IC CHIP IT8502E 0948-JXA QTY 900 NIB

SQUARE D 8803-P00CO4M USPP 8803P00CO4M