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DCS系統在工業生產過程的廣泛應用，使可靠性、穩定性問題更加突出，也使人們對整個系統要求越來越高。人們希望DCS系統盡量少出故障，又希望DCS系統一旦出現故障，能盡快診斷出故障部位，并盡快修復，使系統重新工作。下面簡單介紹故障大體分類及故障診斷的一般方法。
　　一、DCS系統故障的分類
　　為了便于分析、診斷DCS系統故障發生的部位和產生原因，可以把故障大致分為如下幾類。
　　1、現場儀表設備故障
　　現場儀表設備包括與生產過程直接聯系的各種變送器、各種開關、執行機構、負載等。現場儀表設備發生故障，直接影響DCS系統的控制功能。在目前的DCS控制系統中，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、系統故障
　　這是影響系統運行的全局性故障。系統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軟件故障和應用軟件故障。系統軟件是DCS系統帶來的，若設計考慮不周，在執行中一旦條件滿足就會引發故障，造成停機或死機等現象。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系統調試及試運行中十分認真，及時發現并解決。
　　5、操作、使用不當造成故障
　　在實際運行操作中，有時會出現DCS系統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系統的操作工較為常見。

SIEMENS 6AV6-545-0AG10-0AX0 MP270B-10" Touch Glass FreeShip Worldwide

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Modicon AS-T984-107

Schneider Modicon AUTOMATION DEP 216 AS-BDEP-216 DISCRETE INPUT NO WIRE 16X24 VDC

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YS 110420 UC-360DZL Inspection Station / Conveyor

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ALLEN BRADLEY 1395-B63-D1-P50-X1 USPP 1395B63D1P50X1

HARMONIC DRIVE 472446-1 NSFP 4724461

GE FANUC IC3600SSVG1 USPP IC3600SSVG1

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ALLEN BRADLEY 1746-HSCE2 FNFP 1746HSCE2

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Send Us Your Best Offer90 Day warranty on all parts

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ALLEN BRADLEY X-137733 NSPP X137733

ABB DSQC 328A 3HAC 17970-1 DIGITAL I/O UNIT 24VDC

ADJUSTABLE SPEED DRIVE 303D0628

(ABB)DCS Freelance2000 Spare parts DAI 04 good in condition for industry use

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YASKAWA ELECTRIC CIMR-P5U20370F NSFP CIMRP5U20370F

FANUC A860-0055-T061 USPP A8600055T061

EUROTHERM DRIVES 590L-0105-9-1-0-0-2-0-0750-310-012-400-0-00-00-00-00-000 USPP 5

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Spectrum Controls SCC-1 CABLE

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Reliance 45C1

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SIEMENS Simodrive 611 6SN1146-1Ab00-0bA1

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Advantech PCA-6151 w/ CPU and RAM

Allen-Bradley 1771-OAD AC Output Module - ATS 365 Warranty

ABB AF750-30 Contactor 1200-00410

ADEPT 30332-22350 SIO/IDE HARD DRIVE MODULE 10332-22000 WITH CABLES

6SE3223-5DH40 Siemens Midimaster Vector Drive 460 V 6SE32235DH40

9T28Y5604 GE Control Transformer 12KV to 120-240V 5KVA (2) 9F60DMH002E

SUPERIOR ELECTRIC MX2000-6 USPP MX20006

CUTLER HAMMER CE15UN3A80 USPP CE15UN3A80

CIMATRIX 910-2 NSPP 9102

NEMATRON CORP IWS-2623 USPP IWS2623

MITSUBISHI A3A-CPU-R21 USPP A3ACPUR21

FORCE COMPUTERS CPU-30ZBE USPP CPU30ZBE

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A201K6CX, Size 6, Model J, Three Phase

81104A Agilent with 81105A 2 units Pulse Generator

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ASEA BROWN BOVERI 57770163 NSFP 57770163

ALLEN BRADLEY MPL-B4530F-SJ22AA FNFP MPLB4530FSJ22AA

MEASUREX 51305517-100 USPP 51305517100

HONEYWELL 80363975-150 NSPP 80363975150

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SHAPE ELECTRONICS Z5709 USPP Z5709

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Siemens 6ES7 315-1AF01-0AB0 CPU315

Siemens PLC 6ES7 223-1BH22-0XA0 6ES7223-1BH22-0XA0

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TTC FIREBERD 41440 T1/FT1 INTERFACE ADAPTER MODULE FOR ANALYZERS

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Siemens K-TP178 6AV6 640-0DA11-0AX0 Protective Film

Modicon SW-LNET-195

Schneider Modicon DEP 216/AS-BDEP-216 Discrete Input Card PLC 16x24vdc TSX

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GE Fanuc Series Six IC600CB536 Communications Module Type 2

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5PCS RC4558P 4558P OP Amplifier FOR TS-9 TS-808 Mods m

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A06B-0317-B072#C076 FANUC SERVO MOTORS REMANUFACTURED

75 HP 365TS 3600 Explosion Proof Electric Motor

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ALLEN BRADLEY 2706-P74CN2 NSFP 2706P74CN2

ALLEN BRADLEY 1756-M2 USPP 1756M2

HAMMELMANN 00.00124.0089 NSPP 00001240089

WESTINGHOUSE 292B333A10 USPP 292B333A10

TEXAS INSTRUMENTS PLC 5120-11 USPP 512011

GENERAL ELECTRIC 193X375AAG01 USPP 193X375AAG01

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