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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?，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。這對于初次使用DCS系統(tǒng)的操作工較為常見。

SIEMENS I/O MODULE 6FC3984-3RA 6FC39843RA 64E/32AUSGAEN

SIEMENS 6FC3-984-4AM USPP 6FC39844AM

AllenBradleyPanelview550BacklightBulbReplacement

ALLEN-BRADLEY 2711-B5A15X PANELVIEW OPERATOR INTERFACE PANEL NIB

Allen Bradley SLC-500 Output Mod. 16-Point 1746-OW16

ABB IRB 7600 SER 76-27020 ROBOT S4C PLUS CNTRLR TEACH PENDANT W/ MATCHED SET

Adimec MX12P 1K x1K progressive scan camera

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

0.5% Current & Voltage transbers calibrator meter K507 an-g Agilent

MODICON MM-PM22-400 USPP MMPM22400

ALLEN BRADLEY 150-A24NCDB NSFP 150A24NCDB

ADEPT TECH 30846-00020 NSPP 3084600020

GE FANUC IC800SSI104RS1MOD1-BC USPP IC800SSI104RS1

SPIRAX SARCO TMP-600-2NPT USPP TMP6002NPT

SIEMENS 6ES7810-5CC10-0YA5 NSFP 6ES78105CC100YA5

ALLEN BRADLEY 810-A12C NSPP 810A12C

Siemens 6ES5 941-7UB11 6ES5941-7UB11 NIB

Siemens Simatic Output Module 6ES5 451-7LA21 __ 6ES5451

SIEMENS 6ES5-521-8MA22 USPP 6ES55218MA22

Siemens 6ES5 445-3AA12 Output Module 6ES54453AA12 6ES5

Siemens 3RG7344-1CC00 Proximity Switch Photoelectric

Siemens ET200B 6ES7132-0BH11-0XB0 6ES7 132-0BH11-0XB0

SCE2020-4XGBE-MM Cisco Service Control Engine 2020 Network monitoring device

Square D 9080 GCB-100

SIEMENS ASI BLOCK 3RK2200-0DQ00-0AA3 AS-INTERFACE COMPACT MODULE 8I BRAND

WE SHIP SAME Cisco CP-7937G Unified IP Conference Station 7937 C

SIEMENS 6SE6410-2UB12-5AA0 6SE64102UB125AA0

Siemens TP27-6 6AV3627-1NK00-0AX0 Touchscreen Glass

Schneider Modicon Telemecanique TSX08CD12M8AS PLC in box

Schneider Modicon ASBCTR224 SEALED Hi Spd Counter AS-BCTR-224

Schneider Modicon AS-B827-032 USPP ASB827032

Schneider Modicon AS-B840-108 MODULE ASB840108

Schneider Modicon AS-W807-012 USPP ASW807012

Schneider Modicon AS-C921-101 Rev A - C921 COMM Processor

Schneider PLC Output Module TSXDSZ08T2

Siemens 6ES5-464-8ME11 Analog Input Module 16762

RSP720-3C-10GE Cisco Route Switch Processor 720 with 10 Gigabit EN upbs Rout

SIEMENS COROS OP25 OPERATOR PANEL 6AV3525-1EA01-OAXO -

SIEMENS SINUMERIK 840C NC CPU 6FC5110-0BB01-0AA2

Rivulet Communications NCU-PCI module

SIEMENS 6SN2-132-5KW11-1BA1 NSFP 6SN21325KW111BA1

SIEMENS 6RB2100-0NA01 Simodrive Analog Control Board

SIEMENS 6FC5111-0BA01-0AA0 Measuring Circuit Board

ALLENBRADLEY3055DATAMYTEOPERATORINTERFACE

Allen Bradley VersaView 1700P Interface Panel Catalog6181P-17NPXPH!

ABB EH 210 120V OUT OF

Advance HiVolt 1140-90129 OL330/253/07 Power Supply 0090-91806 Rev.A

(H7) 1 GE 44A399734-G01 PC BOARD H7

KMC CONTROLS KMD-5831 USPP KMD5831

ADEPT TECH 30336-31000 USPP 3033631000

FOXBORO D0148MP USPP D0148MP

FANUC A06B-0345-B331 USPP A06B0345B331

SICK OPTIC ELECTRONIC CLV-490-1010 NSPP CLV4901010

RELIANCE ELECTRIC 0-51865-14 NSFP 05186514

SABINA ELECTRIC 6801001 USPP 6801001

Siemens 6ES5 463-4UB12 ANALOG INPUT MODULE

Siemens 6ES5-928-3UB21 NSPP 6ES59283UB21

SIEMENS 6ES5-431-4UA12 NSFP 6ES54314UA12

Siemens 6ES5 523-3UA11 PROCESSOR MODULE CASING 6ES5 491-0LB11 6ES5523-3UA11

Siemens S5 6ES5 491-OLB11

Siemens BCM8001 80011000 Card

Siemens 6ES7 132-0BH01-0XB0 -FS- 6ES71320BH010XB0

Square D 8009 RT8

Norb Networks DS1404036-E5 8-Port 1 Gbps Gigabit Ethernet Interface Module

WS-CDC-2500W CATALYST 6500/7600 2500W DC POWER SUPPLY

SIEMENS 6ES7212-1BB21-0XB0 CPU 222

SIEMENS SIJECT OP15B Membrane Keypad

Reliance 57516

Schneider Modicon Gould AS-B230-501 Output Module ASB230501

Schneider Modicon AS-B356-000 USPP ASB356000

Schneider Modicon AS-S908-120 USPP ASS908120

Schneider Modicon AS-B885-111/ASB885111 Motion Module CLEAN OFFERS ACCEPTED

Schneider Modicon AS-B807-132 ASB807132 32 Point 120VAC Input NIB

MODICON ASB840108 OUTPUT MODULE REP

SIEMENS INPUT MODULE DIGITAL SIMATIC S5 6ES5420-3BA11

Siemens 6ES5 432-4UA12 -FS- 6ES54324UA12

Siemens Panel 6AV8100-1BB00-0AA1 6AV81001BB000AA1

SIEMENS S5 6DD1683-0BC0 POWER SUPPLY UNIT SP8 5V/52A

Trane TCI-3 Communication module

SIEMENS 6SN1118-0DG23-0AA1 6SN11180DG230AA1

SIEMENS SIMODRIVE 611 6SN1111-0AA00-0CA1 REACTOR

SIEMENS 6FC5410-0AY03-1AA0 CPU810D CCV3.4 Free Ship

Advantech PCL-745 Rev.a2 Isolated RS-422/485

Allen-Bradley 1769-OB16 Compact I/O Output Module

ABB Bailey IMCOM03 PS00PD Enhanced Controller XLNT

Adept Six 300 With PA4 amp, CIP 2, Teach pendant, Never put into production

6SN1121-0BA11-0AA1 Version D SIEMENS CONTROLLER CARD

HONEYWELL 51401052-100 USPP 51401052100

TAYLOR ELECTRONICS 6202NZ10000C USPP 6202NZ10000C

CUTLER HAMMER W201K6CF USPP W201K6CF

CONTROL TECHNIQUES DXA-430 USPP DXA430

OMRON F150-C10E NSPP F150C10E

MODICON 140-MSB-101-00 USPP 140MSB10100

GENERAL ELECTRIC DS3800HXRB1D1D USPP DS3800HXRB1D1D

Siemens 6ES5 301-3AB13 6ES53013AB13

Siemens 6ES5-511-5AA14 USPP 6ES55115AA14

SIEMENS 6ES5-315-8MA11 NSPP 6ES53158MA11

Siemens 6ES5 095-8MA03 6ES50958MA03 w/ 6ES5 375-1LA21 MEM Module

Siemens 6ES5 943-7UA22 6ES59437UA22

SIEMENS 6GK1502-4AA10 SINEC L2FO OLM

Siemens TP177A 6AV6642-0AA11-0AX0 Touch Glass + Film

Siemens 6ES5512-5BC12

Keyence KV-L20R Serial Interface Module

YASKAWA ELECTRIC JAMSC-C8130 USPP JAMSCC8130

Siemens 6ES7 216-2AD21-0XB0 6ES7216-2AD21-0XB0 CPU226

Siemens OP27 6AV3627-1LK00-1AX0 Membrane Keypad

RCA 505-7201

Schneider Modicon AS-B828-016 ASB828016 5VDC TTL Output NIB

Schneider Modicon AS-5B41006A USPP AS5B41006A

Schneider Modicon AS-M909-001 USPP ASM909001

Schneider Modicon AS-B132-000 NSPP ASB132000

Schneider Modicon Analog Multiplexer Voltage AS-B846-001 11281

ModiconSchneider554VIC15739554VIC15739PANEL

SIEMENS SIMATIC U-55N 9310 INPUT MODULE 24 V DC

Telemecanique Modicon HMI TSX08H02MK

Siemens Simatic S5 Output Module 6ES5 454-7LB11 CNC

SIEMENS 15" TOUCH SCREEN MONITOR INTERFACE SCD 1597 6AV8 100 6AV8100-1BB00-1AA1

SIEMENS SINUMERIK CNC KEY BOARD 6FC5203-0AC00-0AA2

SIEMENS 6SN1111-0AA00-0BA1 1P6SN11110AA0000BA1

SIEMENS SIMODRIVE 6SN1130-1AA11-0DA0

SIEMENS OP012 6FC5203-0AF02-0AA0 Membrane Keypad 6FC5 203-0AF02-0AA0

Advantech PCL-743B REV.A1 RS-232/485 ISA Card

ALLEN-BRADLEY 2711-NC1 PanelView Connector Cable

ABB 57275812 ANALOG INTERFACE BOARD AIO 86-8/4

ACME ELECTRIC TA-2-81003 USPP TA281003

AAA Power System 300 KVA Power Regulator - T225

8500-B1C-L1AN ALLEN BRADLEY SERVO MOTORS REMANUFACTURED

SIEMENS 6FM1-726-3BA00 NSPP 6FM17263BA00

ASEA BROWN BOVERI HIEE300024R4 NSFP HIEE300024R4

ASEA BROWN BOVERI 073832-003 USPP 073832003

MITSUBISHI FR-A540-2.2K-NA NSFP FRA54022KNA

INDRAMAT HDS03.2-W075N USPP HDS032W075N

ALLEN BRADLEY 702-EAB93 USPP 702EAB93

SQUARE D LAP36400MB NSFP LAP36400MB

Siemens 6ES5-430-4UA11 NSFP 6ES54304UA11

SIEMENS 6ES5 464-8ME11 6ES5464-8ME11

SIEMENS 6ES5431-6AA11 6ES5 431-6AA11 XLNT

Siemens S5 100U AC DIGITAL INPUT MODULE 6ES5 431 8MC11

Siemens 6ES7 407-0DA01-0AA0 6ES7407-0DA01-0AA0 FreeShip

Siemens Profibus PCI Card 6GK1561-1AA01 CP5611 in Sealed Box

PROSOFT MVI56-GSC USPP MVI56GSC

HID VertX V100 Access Control Reader Interface Module

VEEDER ROOT INTERSTITIAL SENSOR INTERFACE MODULE PN 329358-001

Siemens 6AV6642-0DA01-1AX1 OP177B Membrane Keypad

Siemens LOGO 6ED1 052-2HB00-0BA5

Omron 3G2A4-BL021

Schneider Modicon AS-S908-110/ASS908110

Schneider Modicon AS-B875-001 INPUT MODULE ANALOG 4-20MA 8POINT W/CONN AR 800

Schneider Modicon AS-E908-131 NSFP ASE908131

Schneider Modicon GOULD OUTPUT MODULE AS-B804-016 ASB804016

Schneider Modicon AS-B885-002 COMMUNICATION MODULE ASB885002

Schneider Modicon Power Supply M AS-P120-000 ~SEALED NIB SURPLUS~

SEEK ELECTRONICS AS-8550SX I/O TERMINAL UNIT

Schneider Telemecanique ATV31 CPU Board

SiemensDigitalInput/OutputModulew/LEDDisplay

Siemens 6AV6545-0BA15-2AX0 6AV6 545-0BA15-2AX0 SIMATIC TP 170A 6 Touch Panel

SIEMENS SINUMERIK 3/800 6FC3988-7AH20 TESTED WARRANTY

GE Fanuc IC630CCM300A Data Communications Module

SIEMENS SIMODRIVE 6SN1145-1AA01-0AA1SINUMETIK 840D NCU-BOX 6FC5247-0AA00- #6

SIEMENS Sinumerik 6FC5110-0DB01-0AA1 E.Stand J CPU Interface Module

SIEMENS MOORE PRODUCTS 91F-60 AIR FILTER PRESSURE REGULATOR 60PSI 1/4NPT PNEUMATIC FLOW

ALLEN-BRADLEY MICROLOGIX 1200 1762-OF4 4 CH. ANALOG OUTPUT MODULE SER QUANTITY

AB Allen Bradley 1395 75 HP DC Motor Controller / Drive

AC Electric Motor Drive - 60 HP - 600 Volt - Three Phase Input

A06B-0502-B001 FANUC SERVO MOTORS REMANUFACTURED

75 HP Rotary Phase Converter with DIGITAL Control and Starter

RELIANCE ELECTRIC 803612-SE USPP 803612SE

ALLEN BRADLEY 4100-212-P USPP 4100212P

ALLEN BRADLEY 1774-LP1 USPP 1774LP1

INDRAMAT 268613 USPP 268613

XYCOM 9465-KPM USPP 9465KPM

TRICONEX 3805E USPP 3805E

HITACHI OLINK-H USPP OLINKH

Siemens 6ES5-242-1AA13 USPP 6ES52421AA13

SIEMENS 6ES5 375-1LA41 6ES53751LA41

SIEMENS CPU 943 115U 6ES5 943-7UA22 6ES5943-7UA22 EPROM

Siemens 6ES5 998-0UB23 NSFP 6ES59980UB23

SIEMENS 6ES5-464-8MA21 6ES5464-8MA21 Analog Input

Siemens MP270B 6AV6 545-0AH10-0AX0 Touch Glass

RELIANCE ELECTRIC 0-57416-L REMOTE I/O COMM. MODULE

Texas Instruments 500-5035

Square D 8030 CRM255 SY/Max Interface Module in Box Sealed

uPLC01 PLC with CANopen DeviceNet EtherNet/IP Modbus

Siemens C98043-A7010-L2-5

Modicon AS-W808-002

Schneider Modicon AS-BDAP-208 IN A BOX

Schneider Modicon DAP 218/AS-BDAP-218 042701664 Output Module

Schneider Modicon AS-BDAP-250 NSFP ASBDAP250

Schneider Modicon AS-B885-111

Schneider Modicon /Gould AS-P453-621 Remote I/O Module (UVG)

Schneider Modicon Cable Assy. M AS-W808-002 ~ SURPLUS~

Schneider Modicon TSX-3722-001 TSX3722001

Schneider TSXAEY420 Analog Input Module TSX Premium no Box

Redback FE2 Forwarding Engine for SMS 1800 FE2-1K-48

Siemens 6ES5470-4UB12 Analog Output Module ~60 DAY WARRANTY~

SIEMENS FACTORY SEALED 6FC5203-0AF53-1AB2 6FC52O3-OAF53-1AB2 SINUMERIK OPERATOR

MITSUBISHI MELSEC A1SJ71UC24 - R4 COMMUNICATION MODULE

SIEMENS Simodrive 6SN1113-1AA00-0BA0 6SN1113 1AA00 0BA0

SIEMENS SINUMERIK I/O MODULE 6FC5611-0CA01-0AA0

SIEMENS 6N24P / ECC89 / 6FC7 Russian tubes Lot of 130

ALLENBRADLEY1746-NO8IANALOGOUTPUTMODULE1746NO8I1746-N08I

ALLEN BRADLEY SLC 500 ANALOG OUTPUT MODULE 1746-NO4I SER A ONLY MODULE SELL

ABB ROBOT SERVO 3HAB 6738-1/06

A06B-0143-B084#7008 FANUC SERVO MOTORS REMANUFACTURED

0020-27275 CLAMP RING,COH Ti/TiN POISON HI-PWR,SNNF

MODICON NW-0278-000 USPP NW0278000

ALLEN BRADLEY 150-B180NBD USPP 150B180NBD

ALLEN BRADLEY 1326AB-B4E-11 USPP 1326ABB4E11

GENERAL ELECTRIC 12JBCG53K6A USPP 12JBCG53K6A

SQUARE D 9070-SK3000G2D1G13P1 NSFP 9070SK3000G2D1G1

SIEMENS 6RA7-025-6FV62-0-Z USPP 6RA70256FV620Z

ASEA BROWN BOVERI 264C901A07 NSFP 264C901A07

Siemens 6ES5 943-7UA22 6ES59437UA22

Siemens Simatic S5 6ES5 318-8MB13

SIEMENS 6ES5-700-1LA12 USPP 6ES57001LA12

Siemens 6ES5 453 6AC11 6ES54536AC11 BOXED

Siemens 6GK15511AA00 CP5511 6GK1 5511AA00 NIB FS

Siemens G85139-E1721-C883-C

SattCon 05-Slimline SDA module SatControl ABB

Square D B6.90

SIEMENS CERBERUS PYROTRONICS TRI-R INTERFACE MODULE

WATLOW 146D-1E1D-3100 TEMPERATURE CONTR 0-799'C 120VAC

Siemens 6SE70 CUCP Board A5E00444036

Siemens TP7 6AV3 607-1NH00-0AX0 Touchscreen Glass