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DCS系統(tǒng)在工業(yè)生產過程的廣泛應用，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，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)生的部位和產生原因，可以把故障大致分為如下幾類。
　　1、現(xiàn)場儀表設備故障
　　現(xiàn)場儀表設備包括與生產過程直接聯(lián)系的各種變送器、各種開關、執(zhí)行機構、負載等?，F(xiàn)場儀表設備發(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備本身的質量和壽命所致。
　　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)軟件故障和應用軟件故障。系統(tǒng)軟件是DCS系統(tǒng)帶來的，若設計考慮不周，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。應用軟件是用戶自己編定的。在實際工程應用中，由于應用軟件工作復雜，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 6ES5-464-8ME11 4x4 20mA analog card

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Texas Instruments 500-5047

Wells Fargo Alarm SRX-2L ADDRESSABLE INTERFACE MODULE

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SYMAX 8010-SFW-473 NSFP 8010SFW473

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JAGUAR XJ6 INTERFACE FAILURE LIGHT ICU MODULE 1982-87

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Parker TQ10-EHS

Schneider Modicon AS-B873-001/ASB873001 Analog Output Beautiful

Schneider Modicon AS-521P-106 NSFP AS521P106

Schneider Modicon AS-M680-008 NSFP ASM680008

Schneider Modicon AS-884A-311 Programmable Modbus Controller AS884A311

Schneider Modicon 5 Slot Subrack M DTA 201 / AS-HDTA-201 ~ SURPLUS~ Qty. x3

Schneider Modicon TSX COMPACT 24VDC 0.5A OUTPUT MODULE AS-BDAP-216N LOT OF 3

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Allen-Bradley 2711-T9C1 PanelView 900

ABB 3HNA012283-001 Paint Teach Pendant for IRB580 5400 5500 IRB52 99%

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A20B-0009-0534 Fanuc Spindle Drive, Complete drive system

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ALLEN BRADLEY SP-155800 NSFP SP155800

MEASUREX 6542800006 NSPP 6542800006

HORNER ELECTRIC HE700GEN200 NSFP HE700GEN200

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Modicon SW-WVDD-195

Schneider Modicon DAU-202/AS-BDAU-202 Analog Ouput Single Isol

Schneider Modicon AS-P371-002 Pack of 10 Memory Module

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Reliance Electric Analog Input Module 57C409 factory

Texas Instruments 500-2101

Spirent Adtech AX/4000 401321 Frame HSSI Interface

VIC2-2FXS CISCO TWO-PORT VOICE INTERFACE CARD FXS

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Modicon AS-W199-012

Schneider Modicon AUTOMATION AS-BDEP-218 TSX COMPACT INPUT MODULE 16 POINT 115VAC ISO

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Schneider Modicon AS-BDAP-015 NSPP ASBDAP015

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Schneider Modicon AS-B885-110 Module asb885110

Schneider Modicon AS-W510-002 ASW510002 30.5"

Schneider Merlin Gerin 59704 SEP383

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MOLEX 1120160018 BACKPLANE COMMUNICATION MODULE

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AllenBradley1769-OB32CompactI/OOutputModule

Allen Bradley SLC 500 Output Module Cat 1746-OV8 Ser. A

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ACTION INSTRUMENTS AIOI8100 USPP AIOI8100

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SCHNEIDER DISCRETE VDC/VAC OUTPUT DAP 218/AS-BDAP-218

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Schneider Modicon Power Supply AS-P840-000 115/230 VAC

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SIEMENS SINUMERIK 820 T 6FX1128-1BA00 WITH MODULE TESTED WARRANTY

Schneider Automation Communication Module TSXSCM2116 Ver. 2.3 WARRANTY

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