3BSE036714R1
3BSE036714R1
：祖巧丽
：
控制类产品名目繁多，各家叫法不一。通常使用的控制类产品包括DCS、PLC两大类。我们又将DCS的概念拓展到FCS。
DCS(Distributed Contorl System),集散控制系统，又称分布式控制系统。
FCS(FieldBus Contorl Syestem)，现场总线控制系统.
PLC(Program Logic Control ),可编程逻辑控制器.
下面，小7用两个篇章，讲讲 FCS、DCS、PLC的区别是啥!
*篇章：FCS和DCS的区别
传统方式：现场级设备与控制器之间连接采用一对一I/O连线方式
现场总线技术：使用一根电缆连接所有现场设备
FCS和DCS的详细对比
| 性能 | FCS | DCS |
| 结构 | 一对多：一对传输线接多台仪表，双向传输多个信号。 | 一对一：一对传输线接一台仪表，单向传输一个信号。 |
| 可靠性 | 可靠性好：数字信号传输抗*力强，精度高。 | 可靠性差：模拟信号传输不仅精度低，而且容易受干扰。 |
| 失控状态 | 操作员在控制室既可以了解现场设备过现场仪表的工作情况，也能对设备进行参数调整，还可以预测或寻找故障，使设备始终处于操作员的过程监控与可控状态之中。 | 操作员在控制室既不了解模拟仪表的工作情况，也不能对其进行参数调整，更不能预测故障，导致操作员对仪表处于“失控”状态。 |
| 控制 | 控制功能分散在各个智能仪器中。 | 所有的控制功能集中在控制站中。 |
| 互换性 | 用户可以自由选择不同制造商提供的性能价格比*的现场设备和仪表，并将不同品牌的仪表互连，实现“即插即用”。 | 尽管模拟仪表统一了信号标准（4~20mA DC），可是大部分技术参数仍由制造厂自定，致使不同品牌的仪表互换性差。 |
| 仪表 | 智能仪表除了具有模拟仪表的检测、变换、补偿等功能外，还具有数字通信能力，并且具有控制和运算能力。 | 模拟仪表只具有检测、变换、补偿等功能。 |
FORCE CONTROL 502-M2-MS-03 SERVICE PARTS KIT, NEW IN BAG
INGERSOLL-RAND / SOCATT PAD 77A-M825-7 *NEW*
BRADLEY PLASTIC EYEWASH BOWL DUST COVER S45-1964 *NEW*
BANNER 3FT RIGHT ANGLE SENSING END FIBER OPTIC CABLE ITA13S *NEW*
COSTGUARD 5 MICRON WATER FILTER CARTRIDGE CG5-20 *NEW*
WIDIA 1/4 BOT TAP 14024 *NEW*
WIDELL 1 7/8-12 H6 6FL S/S BOTTOM TAP
STANLEY A30LRA2-5 3/8" DRIVE ANGLE PNEUMATIC NUT RUNNER
FALK STEELFLEX FOR 50 & 1050T10 COVER GRID ASSEMBLY NIB
EAS 1/4" NPT FEMALE MONO COUPLER KBF6 *NEW*
STARCUT 1459758, GUNDRILL COOLANT, 13 7/8" OAL, 0.609", 5 1/2" SHANK, NIB
BELL & GOSSETT 3" X 4" CENTRIFUGAL PUMP SIZE 185016
APPLETON 1" ANGLE LIQUID TIGHT MALL IRON CONNECTOR ST-90100 *NEW LOT OF 3*
EATON 1/4"NPTM BRASS FITTING 68X6 *NEW LOT OF 10*
HARDING CS 001185001 FAN GRILL, LOT OF 2, NEW IN BAG
MORSE 2 1/2 - 4, TAP, NC, HS, GH-7, 6 FLUTE, 8 3/4" OVERALL LENGTH
OMRON E3C-S10 PHOTOELECTRIC SWITCH
YALE BACKCHECK SPRING ADJUSTMENT REVERSIBLE ALUMINUM DOOR CLOSER 3501 NEW
FESTO MINI PNEUMATIC CYLINDER AV-12-4
FALK 1.625" KW 3/8" X 3/16" COUPLING HUB, 1040T *NEW*
PHD CYLINDER ONLY BS10 1 X 20 -B-H4 NNB
FESTO MAINFOLD BLOCK FR-4-1/4C
WATTS FLUIDAIR 1/4" NPT INSERT KIT, IK20Y *NEW*
MOORE I/P CONVERTER 4-20MDAC 3-15PSI
TALEMA TOROIDAL POWER TRANSFORMER 8755-P2S2
DOOSAN WASHER TONGUE D917238 LOT OF 2 NEW
PARKER 3/8"NPT HYDRAULIC ROTARY ACTUATOR SERIES PS
BROWNING J50 S/C C/L CONNECTING CHAIN LINKS, LOT OF 2, NEW IN BAG
SLOAN A-15-A MOLDED DISC DIAPHRAGM FOR ROYAL & REGAL, LOT OF 5 NEW IN BAG SEALED
SMC 1/2" NPT MODULAR PIPING ADAPTOR E40T-04 *NEW IN BAG*
CARD 1-3/16-7 NS 4-FLUTE HAND TAP B-1
PARKER 4F-C4L-10-B CHECK VALVE, 1/4" NPT, 3000 PSI, NIB
EMECANIQUE ZCK J922H4 BODY CONTACT, NEW IN BAG
KAO 5.25" DOUBLE SIDED DOUBLE DENSITY DISKETTES MD2D *NEW LOT OF 10*
SKF EXPLORER BEARING 6205-2Z/C3 NIB
NIAGRA 1-1/2X3/4X1-5/8 2 FLUTE END MILL
SKF SNW 15X2-1/2" BEARING ADAPTER SLEEVE NIB SKF HE315
GREENFIELD 1 3/8-6, ROUND ADJUSTABLE DIE, NC, HS, 4 FLUTE, 3" OD, NIB
SALINA VORTEX CYLINDER DUC4.5X6-MG GRA05-F-S4-MG-W?S1-LL
3M 1" x 50YD, 80 GRADE, CLOTH UTILITY ROLL 051144-05110 *NEW*
FESTO 5-10 BAR CONTROL VALVE GR-1/8B0 151215 K008
HAGER 3.5" x 3.5", 1/2 M.S, FULL MORTISE-STD US 26D *NEW*
ECLIPSE 5/8" PIN DRIVE COUNTERBORE 413 6342
PARKER 250PSI, 2-PORT, 3/8"NPT FLOW CONTROL VALVE 3250G0319 *NEW*
LINCOLN DIVIDER VALVE UV-15S *NEW,SEALED*
CLEVELAND S62154 STYLE FORD SIZE 368 X 469 TAPER SHANK DRILL, 36YA-368 *NEW*
SATURN CIRCUIT BOARD CFUJK3-4 / SDB41024-2
PHD 1-3/8" X 3/4" PNEUMATIC CYLINDER 02942384-01 *NEW*
CLEVELAND 08686, SIZE 22 TAPER LENGTH DRILL, 5-3/4" OAL, HS, LOT OF 11, NEW
HALOGEN LEAK DETECTOR H25C-1N-6-N-E-P?S
HILTI 1" x 6" ANCHOR BOLT KB II 00045412 *NEW, LOT OF 3*
BRAD HARRISON 41360 MINI-CHANGE 5P FEMALE CORDSET, 6', NEW IN BAG
3M BLENDERM 1/2" x 5YD SURGICAL TAPE 1525-0 BOX OF 15
3M 7-1/8" FIBRE DISCS 983 CR *NEW, SEALED LOT OF 25*
UNION BUTTERFIELD 1/4X7, 4 FLUTE HAND TAP
DIXON 2-1/2" TO 5-1/2" RANGE, HOSE CAMPS HS-80 *LOT OF 10, NEW*
SMC 3/16" TUBE, 1/8"NPT FITTING KQU05-34S *NEW* LOT OF 10
WARNER 3/4" OPEN BALL BUSHING TWD-12 WRN *NEW*
BROWNING 7/8" BORE, SPLIT TAPERED BUSHING Q1 1 7/8 *NEW*
CM BIG ORANGE 2G804 1/8" WIRE ROPE CLIPS, LOT OF 5, NEW IN BAG
SANDVIK 2-1/2" STAINLESS STEEL CLAMP 76.1 / 9204 LOT OF 4
BRAD HARRISON 883030D01M003, 3P MALE/FEMALE CORDSET EXTENSION, NEW IN BAG
