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DCS系统在工业生产过程的广泛应用，使可靠性、稳定性问题更加突出，也使人们对整个系统要求越来越高。人们希望DCS系统尽量少出故障，又希望DCS系统一旦出现故障，能尽快诊断出故障部位，并尽快修复，使系统重新工作。下面简单介绍故障大体分类及故障诊断的一般方法。
　　一、DCS系统故障的分类
　　为了便于分析、诊断DCS系统故障发生的部位和产生原因，可以把故障大致分为如下几类。
　　1、现场仪表设备故障
　　现场仪表设备包括与生产过程直接联系的各种变送器、各种开关、执行机构、负载等。现场仪表设备发生故障，直接影响DCS系统的控制功能。在目前的DCS控制系统中，这类故障占绝大部分。这类故障一般是由于仪表设备本身的质量和寿命所致。
　　2、系统故障
　　这是影响系统运行的全局性故障。系统故障可分为固定性故障和偶然性故障。这类故障一般比较明显且影响也是局部的，它们主要是由使用不当或使用时间较长，模板内元件老化所致。
　　3、硬件故障
　　这类故障主要指DCS系统中的模板(特别是I/O模板)损坏造成的故障。这类故障一般比较明显且影响也是局部的，它们主要是由使用不当或使用时间较长，模板内元件老化所致。
　　4、软件故障
　　这类故障是软件本身所包含的错误所引起的，软件故障又可分为系统软件故障和应用软件故障。系统软件是DCS系统带来的，若设计考虑不周，在执行中一旦条件满足就会引发故障，造成停机或死机等现象。此类故障并不常见。应用软件是用户自己编定的。在实际工程应用中，由于应用软件工作复杂，工作量大，因此软件错误几乎难以避免，这就要求在DCS系统调试及试运行中十分认真，及时发现并解决。
　　5、操作、使用不当造成故障
　　在实际运行操作中，有时会出现DCS系统某功能不能使用或某控制不封不能正常工作，但实际上DCS系统并没有毛病，而是操作人员操作不熟练或操作错误所引起的。这对于初次使用DCS系统的操作工较为常见。

(Q7-6) 1 INDRAMAT MAC90C-2-KD-1-B/110-A-0/J625/S01 SERVO MOTOR Q7-6

MODICON 384B USPP 384B

ALLEN BRADLEY 150-B180NBDB-8L USPP 150B180NBDB8L

ALLEN BRADLEY 1771-QDC NSFP 1771QDC

NIKKI DENSO NPSA-ZMTA-101AE-CE USPP NPSAZMTA101AECE

GORING KERR DSP2-SST USPP DSP2SST

RELIANCE ELECTRIC 0-864660-74R USPP 086466074R

SIEMENS 6ES5-451-3AA11 USPP 6ES54513AA11

Siemens 6ES5 470-4UA12 6ES54704UA12

Siemens 6ES5-944-7UB21 NICE

SIEMENS 6ES5-436-4UA12/6ES5436-4UA12 INPUT MODULE NIB

Siemens 6ES5 710-0AA11 Sub Racks

Siemens S5 6ES5 941-7UA13 37352

SIEMENS C85139-E1721-A880

Siemens 6ES5100-8MA02 6ES5 100-8MA02 SIMATIC S5-100U CPU100 Controller

Square D 8020 SCP-423

OFFER WIN- Allen-Bradley 1492-IFM20D120 Ser.A Rev.A Interface Module

WS-C3560V2-24TS-SD FREE 1 YEAR CISCO 3560V2 SWITCH

Siemens 6ES7291-8GE20-0XA0 Memory Module

Siemens SIMATIC S7-400 6ES7 412-2XG00-0AB0 CPU 412-2

Reliance 803612-SE

Schneider Modicon ASW808002 Excellent Cable Assembly AS-W808-002

Schneider Modicon AS-B422-000 USPP ASB422000

Schneider Modicon AS-TM84-001 NSFP ASTM84001

Schneider Modicon AS-BDAP-216 DISCRETE OUTPUT MODULE 16X24VDC

Schneider Modicon AS-B824-016 24 VDC OUTPUT TRUE HIGH

MODICON AS-B350-001 OUTPUT MODULE GOULD AEG B350 115 VOLT AC

SIEMENS INPUT MODULE 505-4332 5054332

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

SIEMENS OPERATOR INTERFACE TOUCH PANEL SIMATIC TP27 6AV3 627 6AV3627-1QL01-0AX0

SIEMENS Sinumerik 3 QDM-9WD-120 LCD Upgrade Kit

Telemecanique TSX MPT 10 Telway 7 Communication Module

SIEMENS 6SN1118-0DM23-0AA0 6SN11180DM230AA0 Servo

SIEMENS SIMODRIVE - 6SN-1145-1BA01-0BA1 E/R Module INT 16/21kw

SIEMENS 6FC5-356-0BB11-0AE1 USPP 6FC53560BB110AE1

Advantech PCM7230-CK001

ALLEN-BRADLEY 1746-OB32 32 ch-DC Output Module For Programmable Controller sour

ABB BAILEY SYMPHONY CONTROLS DIGITAL IMASI23 ANALOG INPUT SLAVE MODULE 88109

ADEPT TECH 10330-10150 USPP 1033010150

(000 BACK AL)1 NIB SIEMENS 6SE7031-0EE60 6SE7090-0XE87-3AC0 CONVERTER DRIVE

IMPERIAL 08134600 USPP 08134600

TECRON 7700 USPP 7700

DYNAMATIC 15-503-4003 USPP 155034003

CUTLER HAMMER 1MTBE800R NSFP 1MTBE800R

PEPPERL & FUCHS MVH2000-F15 USPP MVH2000F15

MODICON AS-516P-008 NSPP AS516P008

HONEYWELL 30734558-001 USPP 30734558001

Siemens 6ES5 308-3UC21 6ES53083UC21

Siemens 6ES5-526-3LA11 NSFP 6ES55263LA11

SIEMENS 6ES5-373-0AA41 USPP 6ES53730AA41

Siemens 6ES5 255-1AA11 6ES5255-1AA11 6ES52551AA11

Siemens 6ES5-430-7LA11/6ES54307LA11 NICE

SIEMENS 6GK7343-1CX00-0XE0

Siemens TP27 6AV3 627-1QK00-2AX0 Touchscreen Glass

Siemens 6ES5788-8MA11

Latest Bluetooth Module Cradle 2005 to 2008 Mercedes E320 E350 E500 E550 E55 E63

YASKAWA ELECTRIC DISCT-J1040 USPP DISCTJ1040

Siemens 6ES7 223-1BH00-0XA0 6ES7223-1BH00-0XA0 FreeShip

Siemens OP37 6AV3 637-1ML00-0FX0 Membrane Keypad

Reeves SBAI-1001-11

Schneider Modicon AS-B807-032 ASB807032 32 Point 120 VAC Input

Schneider Modicon AS-884A-201 PROCESSOR MODULE AS884A201

Schneider Modicon AS-P180-010 USPP ASP180010

Schneider Modicon AS-B243

Schneider Modicon AS-5540-003 Bus Duct

Modicon TSX Quantum 24-230 VAC Output Module 140DAO84000

SIEMENS SIMATIC S7 SM321 DIGITAL INPUT MODULE PLC 6ES7 321 6ES7321-1BH02-0AA0

TELEMECANIQUE XBTGT2110 Touchscreen Glass

Siemens Simatic Relay Output Module 505-4916A 16 pts

Siemens 9510 9510DC-1156-GZZA NIB Power Meter Display ION Ethernet Access

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

SIEMENS 6SN1123-1AA00-0EA0 6SN1 123-1AA00-0EA0 SIMODRIVE 611 160A Ver D

SIEMENS SIMODRIVE 6SN1123-1AA00-0LA1

SIEMENS HMI 6FC5253-6BX10-2AFC PCU 50 566mHZ6FC5210- 00F20-0AA0840D BS003

Advantech PCM-7130 Rev.A1 NIB

ALLEN-BRADLEY 2711-K5A20 PANELVIEW 550 2711K5A20 CLEAN TESTED GOOD COND.

ABB 6008BZ10000C VIDEO MODULE PCB

Acterna ANT-20

6962ED2580A2 Starter CUTLER HAMMER

8520CPUX ALLEN BRADLEY ELECTRONIC CIRCUIT BOARD REMANUFACTURED

SIEMENS 6SE3-221-3DC40 USPP 6SE32213DC40

AVTRON AFS110-4CN0-C USPP AFS1104CN0C

ASEA BROWN BOVERI MSB63800L NSFP MSB63800L

MODICON 140-CPU-534-14 USPP 140CPU53414

INDRAMAT MDD071C-N-030-N2S-095PB0 NSFP MDD071CN030N2S01

ASEA BROWN BOVERI ACH401601632+A0BE0000 USPP ACH401601632A0BE

TITAN CORPORATION MMI-150 USPP MMI150

Siemens 6ES5-441-7LA13/6ES5441-7LA13 OUTPUT MODULE NIB

SIEMENS 6ES5 521-8MA21 6ES5521-8MA21

SIEMENS S5 6ES5 310-3AB13 6ES53013AB13

Siemens S5 6ES5 544-3UA11 6ES5544 6ES55443UA11

Siemens 6ES7 953-8LG20-0AA0 6ES79538LG200AA0 128K MMC in Box ping

Siemens S5 PLC Lithium Battery 6ES5 980-0AA21 NIB

PMA DC 150-CAN intelligent DDC control PLC 16 digital I/O 9407 700 50341

HONEYWELL EXPERIAN TC-CCR013 DUAL REDUNDANT NET INTERFACE MODULE

Wago 750-631 Interface Module 750631

Siemens 6DS1325-8AA 6DS13258AA in Box, Seal opened,

Siemens LOGO! 230RC 6ED1052-1FB00-0BA6 in box

Omron 3G2A5-PS221E

Schneider Modicon AS-M84A-102 ASM84A102 CPU Processor NIB

Schneider Modicon MEMORY BOARD AS-506P-F12 REV C21 /REPAIRED

Schneider Modicon AS-H819-107 NSPP ASH819107

Schneider Modicon GOULD/ MODULE - AS-B814-001

Schneider Modicon AS-BDEO-216 INPUT MODULE ASBDEO216

Schneider Modicon REMOTE I/O ADAPTOR POWER SUPPLY AS-P890-0005201

Telemecanique Inverter Operator Panel ATV71

Schneider Telemecanique Overload Relay LRD16KN

SIEMENS/TI/CTI 505-2599/2599 32PT AC OUTPUT MODULE XLNT

Siemens 6AV6 542-0CA10-0AX0 6AV65420CA100AX0 Panel

SIEMENS Sinumerik 6FC5147 0AA05 0AA0 6FC51470AA050AA0

GE FANUC COMMUNICATION CONTROL MODULE IC693CMM311G IC693CMM311-G

SIEMENS WARRANTYDigital High Performance Control Board

SIEMENS SINUMERIC 840D 6FC5247-0AA00-0AA2

SIEMENS Bellows Assembly for Moore Valve Positioner 118-190

Allen-Bradley Cat. No. 1771-OGD TTL Output Module

AB PLC PLC-5/V30B 1785-V30B PLC-5-V30B ``NICE``

AC Motor Invertor - 60 HP - 600 Volt - Three Phase Input

A06B-0731-B900#0900 GE FANUC AC SERVO SPINDLE REMANUFACTURED

750’ 8/5 SOOW SO Portable Power Cord Adjustable Water Resistant Outdoor 600V

RELIANCE ELECTRIC SA3000DC070 USPP SA3000DC070

ALLEN BRADLEY 5370-CVIM NSFP 5370CVIM

ALLEN BRADLEY 20BD027A3AYNADC0 NSPP 20BD027A3AYNADC0

INDRAMAT MAC093B-0-JS-2-C/130-B-0/S005 NSFP MAC093B0JS2C130B

YASKAWA ELECTRIC CPCR-AN051B NSPP CPCRAN051B

WESTINGHOUSE 4256A88G04 USPP 4256A88G04

INDUSTRIAL DEVICES SMARTSTEP23 USPP SMARTSTEP23

Siemens 6ES5-246-4UA31 USPP 6ES52464UA31

SIEMENS 6ES5 377-0AA21 -- 6ES53770AA21

SIEMENS MEMORY MODULE 6ES5 375-1LA61

Siemens BOARD 6ES5-400-0AA12 6ES5 400 0AA12 6ES54000AA12 SPCB456 SIEMEN

Siemens 6ES7 138-4CA00-0AA0 with 6ES7 193-4CC20-0AA0

Siemens OEM-OP37 6AV3637-7AB16-0AM0 Membrane Keypad

Reliance 57401 57401-2 Digital I/O Module NIB

Texas Instruments 505-4632

Sunpak Auto 422 D Thyrister Camera Flash w/ Canon CA-1D Interface Module 422D

UBR7200-NPE-G1 CISCO UBR NPEG1 ENGINE W/ 512MB D/64MB F 3 GE/FE/E

Siemens CP 243-2 6GK7 243-2AX00-0XA0 6GK7243-2AX00-0XA0

Modicon DB-043505843

Schneider Modicon /Schneider Electric AS-M480-004/ASM480004

Schneider Modicon ASB233501 Input Module AS-B233-501

Schneider Modicon AS-BDEP-211 INPUT MODULE FACTORY SEALED

Schneider Modicon AS-BDAP-217 Output Relay ASBDAP217

Schneider Modicon -AS-506P-F32

Schneider Modicon DEP 209 AS-DEP-209 /

Schneider Telemecanique Advantys DDI3425

Schneider Modicon Premium TSXDEY32D2K 32 Discrete Input Module

QUAD CORE Q9400 3.4GHz OCED GAMING PC w/NVIDIA GT220 1G

SIEMENS 6ES5454-4UA12 SIMATIC OUTPUT MODULE 16PT QUANTITY

SIEMENS SAJO Sinumerik 8 MC 8MC HMC 600 800 G54 G55 G56 G57 G59

MITSUBISHI A1SJ71C24-R2 COMMUNICATIONS MODULE RS-232-C UNIT

SIEMENS Simodrive 6SN1123-1AA00-0AA0 _ 6SN11231AA000AA0

SIEMENS SINUMERIK 840DE NCU 561.2 6FC5356-0BB11-0AE0

SIEMENS /MOORE 39VIMCBN APACS VIM MODULE 16171-121/5

Allen-Bradley VersaView 1750M 17 Touchscreen Color Monitor

Allen Bradley SLC 500 1746-OA8 1746OA8 Output Module Ser A NOB

ABB Robotics API Elmo PS 90/6-57-P-LSS-4404 AC Servo Motor 3 HAC 3403

A06B-0147-B075#7076 FANUC SERVO MOTORS REMANUFACTURED

0300P-4NAN-0001 REULAND AC SERVO SPINDLE

NACHI BUY-222 USPP BUY222

ALLEN BRADLEY 1756-L55M16 NSPP 1756L55M16

ALLEN BRADLEY 1336-BDB-SP30D USPP 1336BDBSP30D

GENERAL ELECTRIC 531X300CCHATM3 USPP 531X300CCHATM3

SST XL-S-2 USPP XLS2

SIEMENS 6SE7-031-6ES87-2DC0 NSPP 6SE70316ES872DC0

BANNER ENGINEERING MSE-4824 USPP MSE4824

Siemens 6ES5 945-7UA13 6ES59457UA13

Siemens Simatic S5 6ES5 944-7UA21 6ES59447UA21

SIEMENS 6ES5-705-0BB50 USPP 6ES57050BB50

Siemens 6ES5 490-7LB11 NSPP 6ES54907LB11

SIEMENS 6AV3637-1PL00-0AXO TP37-10 touch glass

Siemens Inverter Module 6SE2100-1BB35

SALE Intel i7-2700K 8G 1T60G SSD HD7770/1G Overclock Gaming/Business Computer

TDK PD14A

SIEMENS INTERFACE MODULE 6ES5-318-8MA12

AVAILABLE SERIES A F/W REV A

Siemens 6SE7036-0EF85-0EA0 / C98043-A1691-L1-11

SIMENS MP277-10 6AV6643-0CD01-1AX1 Touch Panel in Box

Schneider Modicon AS-BDAP-210 OUTPUT MODULE NNB

Schneider Modicon ASB872011 TESTED Analog Output Module AS-B872-011

Schneider Modicon AS-B862-001 USPP ASB862001

Schneider Modicon AS-BADU-206 Free Ship

Schneider Modicon CABLE AS-W953-006 FOR P190 TO 984-680

Schneider Modicon AS-H827-209 Rack PN AS-9536-000

Schneider Modicon PanelMate Plus 1000 MM-PM10300C 92-01229-01

SIEMENS 6ES5 464-8MC11 ANALOG INPUT MODULE 4POINT 10V

RME FireFace800 Fireface 800 PROAUDIOSTAR

Siemens Analog module 6ES7-193-0CD40-0XA0

SIEMENS Sinumerik Electronic Component 6FC9302-2BD-01 Warranty

Reliance Electric 57404-1 Network Communications Module

SIEMENS CONTROLLER CARD 6SN1122-0BA11-0AA1

SIEMENS SUN XS6-FC-LXXX-S8-CKZ SDLT600 FC Tray Kit SL8500

SIEMENS 6FC5012-0CA03-0AA0 6FC50120CA030AA0 version A

AllenBradley2711-K9C9PanelView900OperatorInterfaceSeriesCRev.A

Allen Bradley Versa View 1700P - 6181F-17TPXPH Series D

ABB INVERTER MODULE DRIVE ACS600 ACS 600 ACN634 ACN6340100600000300902

Advanced Energy PDX 2500 RF Generator, 4

(no lot#) Allen Bradley SMC Dialog Plus Drive 150-B180NBD 180A

MEASUREX 08622000 USPP 08622000

ALLEN BRADLEY 1336E-B050-AE-EN-HA2-L8E NSPP 1336EB050AEENHA2

GE FANUC IC752DPA262 USPP IC752DPA262

FANUC A16B-1210-0030/06F USPP A16B1210003006F

SIEMENS 6DD1-606-3AC0 USPP 6DD16063AC0

RELIANCE ELECTRIC 45C-200-A NSPP 45C200A

SIEMENS 6FX1-113-6AA00 USPP 6FX11136AA00

Siemens 6ES5 470-7LA11 6ES54707LA11

Siemens 6ES5 948-3UA13 948ucpu

SIEMENS 6ES5-441-4UA11 USPP 6ES54414UA11

Siemens 6ES5 930-8MD11 POWER SUPPLY MODULE IN BOX

Siemens S5 6ES5420-4UA12 6ES54204UA12

Siemens C98043-A1261-L2-05

Siemens 6ES5 470-4UC12 6ES54704UC12

Square D 8030 CC-20

OMRON C500-II002 I/O Interface Unit PLC Module

WS-C2970G-24TS-E CISCO Switch w/1year -WSC2970G24TSE 2970G24TSE

Siemens 6ES7321-1BL00-0AA0 6ES7 321-1BL00-0AA0 NIB

Siemens Simovert Pulse Converter 6SE60 20-1BF00 6SE6020-1BF00 G32970-A0035-A204

Rice Lake Weighing Systems IO-810-3A

Schneider Modicon AS-P120-000 SEALED IN BAG ASP120000

Schneider Modicon AS-B551-001 NSFP ASB551001

Schneider Modicon AS-W600-009 USPP ASW600009

Schneider Modicon AS-BDEP-217 ASBDEP217 24VDC Input LNC

Schneider Modicon AS-B827-032

MODICON ANALOG OUTPUT MODULE AS-B872-011

Siemens Digital Input Module SM321 32xDC24V type 6ES7 321-1BL00-0AA0