现场控制单元一般远离控制中心，安装在靠近现场的地方，其高度模块化结构可以根据过程监测和控制的需要配置成由几个监控点到数百个监控点的规模不等的过程控制单元。
现场控制单元的结构是由许多功能分散的插板（或称卡件）按照一定的逻辑或物理顺序安装在插板箱中，各现场控制单元及其与控制管理级之间采用总线连接，以实现信息交互。
现场控制单元的硬件配置需要完成以下内容：
插件的配置 根据系统的要求和控制规模配置主机插件（CPU插件）、电源插件、I/O插件、通信插件等硬件设备；
硬件冗余配置 对关键设备进行冗余配置是提高DCS可靠性的一个重要手段，DCS通常可以对主机插件、电源插件、通信插件和网络、关键I/O插件都可以实现冗余配置。
硬件安装 不同的DCS，对于各种插件在插件箱中的安装，会在逻辑顺序或物理顺序上有相应的规定。另外，现场控制单元通常分为基本型和扩展型两种，所谓基本型就是各种插件安装在一个插件箱中，但更多的时候时需要可扩展的结构形式，即一个现场控制单元还包括若干数字输入/输出扩展单元，相互间采用总线连成一体。
就本质而言，现场控制单元的结构形式和配置要求与模块化PLC的硬件配置是一致的。
(2)操作站
操作站以来显示并记录来自各控制单元的过程数据，是人与生产过程信息交互的操作接口。典型的操作站包括主机系统、显示设备、键盘输入设备、信息存储设备和打印输出设备等，主要实现强大的显示功能（如模拟参数显示、系统状态显示、多种画面显示等等）、报警功能、操作功能、报表打印功能、组态和编程功能等等。
另外，DCS操作站还分为操作员站和工程师站。从系统功能上看，前者主要实现一般的生产操作和监控任务，具有数据采集和处理、监控画面显示、故障诊断和报警等功能。后者除了具有操作员站的一般功能以外，还应具备系统的组态、控制目标的修改等功能。从硬件设备上看，多数系统的工程师站和操作员站合在一起，仅用一个工程师键盘加以区分。
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General Electric / Ge 175 Amp Circuit Breaker TFJ236175 #14564
General Electric / Ge 150 Amp Circuit Breaker TFJ236150 #14551
General Electric / Ge 150 Amp Circuit Breaker TFJ236150 Scratch & Dent #22934
General Electric / Ge 125 Amp Circuit Breaker TFJ236125 #14563
General Electric / Ge 125 Amp Circuit Breaker TFJ236125 Scratch & Dent #35357
General Electric / Ge 1.5 KVA Transformer 9T58B53 #23275
General Electric / Ge 0.100 KVA Transformer 9T58K0044 #12780
General Electric / Ge .750 KVA Transformer 9T55Y51 #34998
General Electric .750 KVA Transformer 9T55Y51G2 #56462
General Electric .750 KVA Transformer 9T55Y51G2 230/460 VAC w/ Fuse
GENERAL ELECTRIC .50KVA 60HZ 1 PH IS-12 INDUSTRIAL ConTROL TRANSFORMER 9T58B2913
GENERAL ELECTRIC .300 KVA TRANSFORMER 9T56Y125
GENERAL ELECTRIC .25KVA TRANSFORMER 9T51B7 1 PHASE
GENERAL ELECTRIC .25KVA TRANSFORMER 9T51B107 1PH
General Electric .250 KVA Transformer 9T51B0007 #65211
General Electric .25 KVA Transformer PH1 600Vx120/240v 9T51B87
GENERAL ELECTRIC .150 kva TRANSFORMER 9T56Y1805 240/480 hv 120/240 lv
GENERAL ELECTRIC .150 kva TRANSFORMER 9T56Y1805 240/480 hv 120/240 lv
GENERAL ELECTRIC .125KVA TRANSFORMER 119A4246P17 CAT # 9T56Y1805 FREE SHIPPING
General Electric , GE THQL2150 ,GFCI CIRCUIT BREAKER for HOT TUB SPA , 240V
General Electric , GE 2 pole 100 A Circuit Breaker THQB-2100
GENERAL ELECTRIC * TYPE TEY 20A CIRCUIT BREAKER * E11592
GENERAL ELECTRIC * SELECTOR SWITCH * CR305X130N
GENERAL ELECTRIC * RELAY * 600 DC VOLTS * SERIES A * CR120BD050 * NO
GENERAL ELECTRIC * OVERCURRENT RELAY WITH VOLTAGE * 12IJCV1B23A
GENERAL ELECTRIC * MODEL 6 SAFETY SWITCH 60A 240VAC 250VDC * TG4322
GENERAL ELECTRIC * MINIATURE LAMPS * (LOT OF 10) * PN: 15 - 25371 *
GENERAL ELECTRIC * GE PUSH BUTTON NIB * P9MPLRSDN
GENERAL ELECTRIC * ELECTRonIC TUBE NIB * MC 188-5
GENERAL ELECTRIC * ELECTRonIC TUBE NIB * MC 188-5
GENERAL ELECTRIC * D-C AMPERES SHUNT EXTERNAL METER * 0 to 800 Amps
GENERAL ELECTRIC * CURRENT TRANSFORMER * TYPE JAI-O *IN THE
GENERAL ELECTRIC * ConTACTOR * CR353AC2BA1
GENERAL ELECTRIC * COIL 120V 60HZ * 55-530249G 22
General Electric * COIL * 115v / 60 Hz for CR120B RELAY * 55-513696G002 ** ( )
GENERAL ELECTRIC * AUXILIARY ConTACT * CR460932
GENERAL ELECTRIC * 600VAC 30A 250VDC MODEL 10 SAFETY SWITCH * TH3361
GENERAL ELECTRIC * 50A 600VAC CIRCUIT BREAKER * TEC36050
GENERAL ELECTRIC * 30A 600VAC 3-POLE SAFETY SWITCH MODEL 1 * TH3361
GENERAL ELECTRIC * 1PH 240/480V 120/240V-AC * 9T58B2810
GENERAL ELECTRIC * 115/120V COIL * 15D21G002
General Electric (V37320) V-LINE Circuit BreakerSurplus
General Electric (THQB21WY30) Switched Neutral Circuit Breaker,
General Electric (TEF134015) Circuit Breaker, 15 Amp, 3 Pole,
General Electric (TED136020) Circuit Breaker,
General Electric (TEB132090WL) 3 Pole 90 Amp Circuit Breaker,Surplus
General Electric (RT1N) Overload Relay Direct Mount,
General Electric (RL4RA022TJ) Auxiliary Relay,
GENERAL ELECTRIC (GE) WATTHOUR METER (KWH), MODEL I-210, VOLTS 120, 100A, FM1S
GENERAL ELECTRIC (GE) CURRENT LIMITING FUSE--9F60DMH002 TYPE EJO-1 / 2 AMP
General Electric (GE) Breakers (THQL1120AF2)
GENERAL ELECTRIC (GE) - WATTHOUR METER (KWH), MODEL I-210, 240 VOLTS, 200A, FM2S
General Electric (g.e.) Transformer 9T58B2815 #58854
General Electric (g.e.) Contactor CR453AD3ABB #33494
General Electric (g.e.) Contactor CR453AD3ABB #33487
General Electric (g.e.) Contactor CR453AD3ABB Scratch & Dent #33495
General Electric (g.e.) Contactor CR353AD3DA1 #57268
General Electric (g.e.) Contactor CR353AD3D*1 #57269
General Electric (g.e.) Contactor CR353AD3D*1 #33486
General Electric (g.e.) Contactor 453AD3ABB #33496
General Electric (g.e.) 15 Amp Industrial Circuit Breaker TED136015 #33550
General Electric (g.e.) .500 KVA Transformer 9T51B0008 #62024
General Electric (g.e.) .250 KVA Transformer 9T58B47 #52303
General Electric (CR7ZB) 600V.AC Max. 25 Amps Encl.,
General Electric (CR7ZB) 600V.AC Max. 25 Amps Encl.,
General Electric (CR4G3WU) Overload Relay 600V. Max. Trip Range,Surplus
General Electric (CR353CD1AA1) 35 Amp Contactor,
General Electric (CR353CB1AA1) 25 Amp Contactor,
General Electric (CR353CA1AA1) 20 Amp Contactor,
General Electric (CR308X112B) Fuse Clip Kit,
General Electric (CR308X111B) Fuse-Clip Kit, Class, H or J CLF Type,Surplus
General Electric (CR305X250N) Indicating Light Kit,Surplus
General Electric (CR2940UW221A2) HD Oil Tight Illum Push Button, Without Cap
General Electric (CR2940-NA101A) Single Push Button Station,Surplus
General Electric (CR2810A14AP) Coil (22D135G3)
