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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。
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ALLENBRADLEYPANELVIEW550CAT2711K5A10
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INDRAMAT TDM1.2-100-300-W1/115 NSPP TDM12100300W1115
WESTINGHOUSE DS416-1200A-LSIG USPP DS4161200ALSIG
FANUC A06B-6059-H215 USPP A06B6059H215
ELDEC 5060044 USPP 5060044
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NSK ML-YA13096E02AT15 NSFP MLYA13096E02AT15
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Mitsubishi QJ71PB92D Q-Series PROFIBUS-DP Interface Module
WS-X6148A-GE-TX Cisco Classic Interface Module Expansion module 48 ports Switch
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Reliance 0-57002
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Advantech EVOC PCL-812PG REV:1.0 Card
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ABB ACS60100205000C1500000 ACS 600 Series Drive 61301411
AD9644, ADC, SPI, EVALUATION BOARD, AD9644 155KITZ 2096106
6ES7470-1AB00-0AA0 Brand , Factory Sealed,
900' Wesleyan Triplex Aluminum Cable Wire URD 350MCM 350-350-4/0 600Voltage
SQUARE D MHL3670035DC2351 USPP MHL3670035DC2351
CONTROL TECHNIQUES 9500-8607 USPP 95008607
BAYSIDE PG115-150-041 USPP PG115150041
MOORE PRODUCTS 39VIMCCN NSFP 39VIMCCN
MARPOSS 3405073000 NSFP 3405073000
EUROTHERM CONTROLS TC2001/02/150A/380V/00/4-20MA/NONE/SC/V2/PLU// NSFP TC2001021
Siemens 6ES5 135-3UA11 6ES51353UA11
Siemens 6ES5-465-4UA12 NSFP 6ES54654UA12
SIEMENS 6ES5 SERIES 6ES5-465-3AA13 PLC MODULE
SIEMENS S5 6ES5456-4UB11 6ES54564UB11
Siemens 115 CPU 944B 6ES5 944-7UB11 E Stand 09. Plus 6ES5 816-1BB11
SIEMENS 6ES7332-5HB00-0AB0 6ES7 332-5HB00-0AB0 FreeShip
Siemens SITOP 6EP1961-3BA20
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iDatalink ADS-HRN-CH4 T Harness Interface Module
YOKOGAWA F3RZ81-ON RS232 INTERFACE MODULE
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Omron NT20M-DT121-V1
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SIEMENS/TI 505-4232 INPUT MODULE 110VAC 32 POINT XLNT
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COMMUNICATION ECM 8E0035616A
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ALLEN-BRADLEY 6182-AGAZAC INDUSTRIAL COMPUTER 100 TO 240VAC 50/60HZ 0.4/0.25AMP
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ASEA BROWN BOVERI 52614759 NSFP 52614759
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LAMBDA LK343A USPP LK343A
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ACUITY IMAGING AR4000 NSPP AR4000
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Siemens Memory Sub Module 6ES5 375-1LA61 22794
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Texas Instruments 2460221-0001
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VWIC2-1MFT-G703 1-Port Multiflex Trunk G.703 E1 Voice/Wan Interface
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ZYNETIX GLOBE WIRELESS NETWORKS
...the most reliable digital Tach on the market
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