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DCS 的维护可分为：日常维护;预防性维护和故障维护，日常维护和预防维护是在系统未发生故障所进行的维护。故障维护发生在故障产生之后,往往 已造成系统部分功能失灵并对生产造成不良影响;相反,预防性维护是在系统正常运行时,对系统进行有计划的定期维护,及时掌握系统运行状态、消除系统故障隐 患、保证系统长期稳定可靠地运行,形成定期维护的概念。实践证明,定期维护能够有效地防止DCS 突发故障的产生,形成可观的间接经济效益。
　　DCS 系统的日常维护
　　系统的日常维护是DCS系统稳定高效运行的基础，主要的维护工作有以下几点：
　　1) 完善DCS系统管理制度。
　　2) 保证空调设备稳定运行,保证室温变化小于±5℃/h ,避免由于温度、湿度急剧变化导致在系统设备上的凝露。
　　3) 尽量避免电磁场对系统的干扰,避免移动运行中的操作站、显示器等,避免拉动或碰伤设备连接电缆和通讯电缆等。
　　4) 注意防尘，现场与控制室合理隔离，并定时清扫，保持清洁，防止粉尘对元件运行及散热产生不良影响;
　　5) 严禁使用非正版软件和安装与系统无关软件。
　　6) 做好控制子目录文件的备份,各自控回路的PID 参数、调节器正反作用等系统数据记录工作。
　　7) 检查控制主机、显示器、鼠标、键盘等硬件是否完好,实时监控工作是否正常。
　　8) 查看故障诊断画面,是否有故障提示。
　　预防维护
　　有计划地进行主动性、预防性维护,保证系统运行稳定可靠。根据大修周期，利用大修进行一次预防性的维护，以掌握系统运行状态,消除故障隐患。大修期间对DCS 系统应进行彻底、全面的维护，内容包括：
　　1) 系统冗余测试: 对冗余电源、服务器、控制器、通讯网络进行冗余测试。操作站、控制站停电检修。包括计算机内部、控制站机笼、电源箱等部件的灰尘清理。
　　2) 系统供电线路检修。并对UPS进行供电能力测试和实施放电操作。
　　3) 接地系统检修。包括端子检查、对接地电阻测试。
　　大修后系统维护负责人应确认条件具备方可上电，并应严格遵照上电步骤进行。

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INTECOLOR E20FFA-200 USPP E20FFA200

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

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HID VertX V100 Access Control Reader Interface Module

VEEDER ROOT INTERSTITIAL SENSOR INTERFACE MODULE PN 329358-001

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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

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Schneider Modicon GOULD OUTPUT MODULE AS-B804-016 ASB804016

Schneider Modicon AS-B885-002 COMMUNICATION MODULE ASB885002

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SEEK ELECTRONICS AS-8550SX I/O TERMINAL UNIT

Schneider Telemecanique ATV31 CPU Board

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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

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INDRAMAT 268613 USPP 268613

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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

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Modicon AS-W808-002

Schneider Modicon AS-BDAP-208 IN A BOX

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

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

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Schneider TSXAEY420 Analog Input Module TSX Premium no Box

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Mitsubishi Melsec AJ71C24 Computer Link PLC Communication Module AJ71-C24

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Allen Bradley SLC 500 DC Sink output module 1746-OV16 ser.C

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Roland UA-1010 Octa-Capture Audio Interface Producer X2 Upgrade Bundle

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RELIANCE ELECTRIC NETWORK COMMUNICATIONS MODULE 57C404B

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Advanced Energy 6KW Power Supply Pinnacle Model

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GE FANUC IC3600APAB1 NSFP IC3600APAB1

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Square D 8020 SCP-121

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WS-C6503 CISCO CAT 6503 CHASSIS 3 4RU

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Reliance 601739-Y

Schneider Modicon DTA-201 / AS-HDTA-201 Primary Subrack 5 Slots

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Modicon AS-B804-016 Output Module

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Siemens Output Module 6ES5451-4UA11 451-4UA11

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TEXAS INSTRUMENTS REMOTE COMMUNICATION MODULE 560-2126R

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Advantech PCM-3661 A1

Allen-Bradley 1747-L532 SLC 5/03 CPU with I/O modules

ABB Bailey SLC02 Strategic Loop Controller, Un

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(#2934) Allen Bradley GuardMaster SafeZone Multizone Laser Scanner 442L-SFZNM

HONEYWELL TVMP-C0-80-AM0-E00-F10-0U000V-00 USPP TVMPC080AM0E00F1

TB WOODS WF2C4020-0N USPP WF2C40200N

DATAMYTE 953-07 USPP 95307

CONTROL TECHNIQUES UNI-2402 USPP UNI2402

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MODICON 92-00808-02 USPP 920080802

GETTYS DR-D005-001 NSFP DRD005001

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Siemens 6ES5-524-3UA13 NSPP 6ES55243UA13

SIEMENS 6ES5-371-0AA51 MEMORY MODULE 6ES5-371-0AA51

Siemens 6ES5 101-8UX11 Expansion Unit BRAND

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Siemens 6GK7 343-1EX11-0XE0 NIB

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Kingspec Flash DOM Disk On Module 8GB/8G 44Pin Vertical IDE Interface PATA MLC

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Red Lion GEM20000

Schneider Modicon AS-B824-000 PLC

Schneider Modicon AS-884A-101 CPU MODULE AS884A101

Schneider Modicon AS-P110-000 USPP ASP110000

Schneider Modicon AS-B233-501

Schneider Modicon AS-516P-006 Processor Board Rev C21 AIPR/UVG

Modicon XBTF024610 Magelis Operator Interface XBT F024610 24VDC PV: 20 V2.2 1850

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Telemecanique Time Off Delay Block LA2 DT2 0,1-30s

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Advantech PCM-3351F

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AAT-AAT1102-M-T SOP-8 IC Good Quality,Original Pack

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API CONTROLS PS-3303D-E NSPP PS3303DE

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Price includes VAT-Good conditiongood working order

HONEYWELL 51304362-300 INTERFACE MODULE 51304362300

VODAVI 9020-00 CTI INTERFACE MODULE

Siemens 6AV8100-0BC00-1AA1 Membrane Keypad FreeShip

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Omron 3G2A5-LK201EV1

Schneider Modicon AS-P371-002 ASP371002 Program Pack LNC

Schneider Modicon B826 AS-B826-032 800 I/O 24VDC TRU HI OUT 32PT

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Schneider Modicon Gould Automation AS-506P-004 Board

Schneider Modicon AS-BDAP-210 TSX COMPACT MODULE

Schneider Modicon Programmer Pack AS-371-002

TELEMECANIQUE ATV71HU55N4Z ATV71

SCHNEIDER Telemecanique LED XB2BVB4LC DC24V

Siemens6ES7-132-0BL01-0XB0Output Module .5AMP 24VDC

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GE Fanuc HE693IBS100 D Interbus S Communications Module

SIEMENS Simens Milacron Perm Motor 1-606-3505 and SimoDrive 6SC 6111-2AA00