一、PLC与DCS比较

    如果按从弱至强将PLC与DCS的性能划分为1至10个等级，则可将它们的对比列于表1

    表1PLC与DCS的比较

    比较项目PLC控制DCS控制

    高速顺序控制106

    复杂过程控制610

    硬件可靠性98

    联网和通讯功能48

    管理能力39

    系统诊断和报警38

早期的PLC以数字量的顺序控制为主。随着PLC功能不断扩充，PLC增加了模拟量控制功能、PID调节功能、通讯联网功能及分级控制功能等，在过去DCS占统治地位的化工、冶金等行业也可由PLC进行控制。但PLC难以组成大型、复杂、综合的系统，如果过多的PC企图通过网络与过多的PLC通讯，则可能导致瓶颈现象及计时上的困难。

    DCS是由模拟仪表控制系统发展而来，初期的功能以回路调节为主，之后又加入了顺序控制的功能。DCS的设计思想是操作管理集中，控制分散以提高整个系统的可靠性及管理能力。DCS的上述优势使它在控制系统的高端市场仍占主流。但DCS比PLC价位高，对一些资金有限的中小型企业有时难以承受。

​

······················································

产品全新原装，库存现货，质量的保障，优质的服务，诚挚的态度，携程为您服务。

售出产品质保一年，15天有质量问题包退换，全国顺丰包邮 ，

哲讯与您同在，任何问题沟通都不是问题，致力用最低的价格和优势的品质保障，诚信和您共同拿下用户的单子

｝

---------------------------------------------------------------------

金品质，你选择， 品质超群惠选厦门哲讯电气自动化，

诚信经营，质量为首，诚信至上，竭诚为您服务！

对待客户，我们是认真的。

 【诚信经营】【质量可靠】【进口原装】【拆包防伪】

 【大量库存】【当天付款】【顺丰速运】【欢迎抢购】

 ALCO CONTROLS FLANGE SET MODEL# RX-173 3LBS. 7/8" ODF

HUMPHREY PNEUMATIC CYLINDER MODEL # 4-DP-4 STROKE: 4.0" BORE: 2.0"

FABCO PNEUMATIC AIR CYLINDER # E121-XDR-BFR STROKE: 0.958"

DEUBLIN ROTARY UNION # 255-000-019 3/4"NPT TO 1/2"NPT

STRAHMAN VALVES 3/4" BRASS NOZZLE 1LB

SMC PNEUMATIC CYLINDER STROKE: 1.50" # NCGCN32-0150-XC?37 BORE: 32MM

SMC PNEUMATIC CYLINDER STROKE: +/-6" DUAL ENDED # NCGWBA50-0600-X?C37 BORE: 50MM

SAMCO TECHNOLOGIES HYDRAULIC CYLINDER TIE ROD 8" STROKE BORE: 2.5"

ASCO SOLENOID VALVE # WP8320A182 Q AIR 1/4"PIPE 125 PSI 120V. 60HZ. 13.9 WATTS

VERSA 4 WAY VALVE # KSG-4232-HCCA12?0

INGERSOLL RAND PNEUMATIC AIR CYLINDER # 2320-1009-100 10" STROKE

FESTO PNEUMATIC AIR CYLINDER # DSNU1-5/8-14-P 14" STROKE ROD DIA. 0.625"

HANKISON PNEUMATIC FILTER # HF1-12-3 CAT# 3240753

BALDOR SPEED REDUCER # S-926-10-H RATIO: 10:1 TORQUE: 1177 IN-LBS

SEW EURODRIVE GEARHEAD SPEED REDUCER# 80.25.10356.5/0?7 TYPE K46 RATIO: 35.63:1

SEW EURODRIVE GEARHEAD SPEED REDUCER RATIO: 48:1 1.25" BORE

TREND BI METAL THERMOMETER # TI.51 12" STEM -40 T0 120DEG F -40 TO 50DEG C

PARKER PILOT AIR SOLENOID VALVE MODEL# K605903553 WEIGHT: 4LBS

PIAB VACUUM PUMP MODEL# X20A5-BN 1 X 3/8"

ANTUNES CONTROLS PRESSURE SWITCH MODEL# RLGP-A 2" TO 14" WC WEIGHT: 2LBS

NUMATICS AIR FILTER ASSY. MODEL# F30B-06C WEIGHT: 3LBS

ALLEN BRADLEY TIME DELAY RELAY # 849-Z0D321

ALLEN BRADLEY TIME DELAY RELAY # 849-Z0A32

ALLEN BRADLEY TIME DELAY RELAY # 849-Z0D32

SMC SOLENOID VALVE # NVFS3200-3FZ WEIGHT: 1LBS

SMC SOLENOID VALVE # NVFS4100-5FZ WEIGHT: 2LBS

SMC MANIFOLD # NVV5FS4-01T-041 WEIGHT: 9LBS

NUMATICS INC. LUBRICATOR # L 30L04 WEIGHT: 3LBS.

FABCO PNEUMATIC AIR CYLINDER # E221-XK-BFR-MR STROKE: 1.437"

FABCO PNEUMATIC AIR CYLINDER # DSNV-32-80-PPV 3.25" STROKE ROD DIA. 12MM

FESTO PROXIMITY SWITCH # SME0-1-LED-24B 12-27VOLTS 1 AMP 27WATTS

BALDOR 3HP AC MOTOR # CM3704T 208-230/460VAC 60HZ. 1160 RPM 213TC FRAME

BALDOR 2HP SUPER-E SEVERE DUTY AC MOTOR 460VAC 60HZ. 1725RPM 145TC FRAME

BALDOR 2HP SUPER-E MARINE DUTY AC MOTOR 460VAC 60HZ. 1725RPM 143TC FRAME

LEESON 1HP AC MOTOR # 121520.00 208-230/460VAC 60HZ. 1170RPM 145T FRAME

BALDOR 1HP AC MOTOR CAT# M7015 230/460VAC 60HZ. 1750RPM HAZARDOUS DUTY

BALDOR BRUSHLESS AC SERVO MOTOR # BSM4F3-75-D 300VAC MAX. 4000RPM 8.03NM

BAYSIDE RIGHT ANGLE PLANETARY GEARHEAD # RA142-015 RATIO: 15:1 BORE: 0.625"

BALDOR GEARHEAD SPEED REDUCER #F-924-10-B7-G RATIO: 10:1 TORQUE: 893 IN-LBS.

BALDOR GEARHEAD SPEED REDUCER #F926-30-B5-G RATIO: 30:1 TORQUE: 1313 IN-LBS.

​