橫河Yokogawa-SCP461-11-S1
價格
訂貨量(個)
¥2941.00
≥1
店鋪主推品 熱銷潛力款
憩憦憧憤憧憧憭憥憩憧憤
在線客服
1747-M11
控制處理能力
我們知道,一個PLC的控制器,往往能夠處理幾千個I/O點。而DCS的控制器,一般只能處理幾百個I/O點。從集散體系的要求來說,不允許有控制集中的情況出現(xiàn),太多點數(shù)的控制器在實際應用中是毫無用處的,DCS開發(fā)人員根本就沒有開發(fā)帶很多I/O點數(shù)控制器的需要驅動,他們的主要精力在于提供體系的可靠性和靈活性。而PLC不一樣,作為一個獨立的柔性控制裝置,帶點能力十分強。
在人們印象當中PLC的運算速度也比DCS要快很多。從某一個角度來看確實如此,PLC執(zhí)行邏輯運算的效率很高,執(zhí)行1K邏輯程序不到1毫秒,其控制周期(以DI輸入直接送DO輸出為例)可以控制在50ms以內;而DCS在處理邏輯運算和模擬運算時采用相同的方式,其控制周期往往在100ms以上。我們用PID算法來比較時,可以發(fā)現(xiàn)PLC執(zhí)行一個PID運算在幾個毫秒,而NETWORK6000+DCS的T2550控制器解算一個PID也需要1個毫秒,這說明PLC和DCS和實際運算能力是相當?shù)?某此型號的DCS控制器甚至更強。而控制周期上的差異主要與控制器的調度設計有關。新型的DCS控制器學習了大型PLC的設計,在控制周期方面的表現(xiàn)獲得了大幅度的提高。以NETWORK6000+DCS的T2550控制器為例??刂破骺梢栽O置四個不同優(yōu)先級的任務,最小運算周期可以設為10ms,配合高速I/O卡件,控制周期能夠達到15~20ms。而模擬量運算設置在其它周期較長的任務中。
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BUSS FUSES ASSORTED - MTH-4, GMC-2A, MDX-6-1/4 LOT OF 3 ( EACH CONTAINS 5 FUSES)
RELIANCE 600VAC CLASS-RK5 FUSE LOT OF 3 ECSR 6-1/4
FERRAZ SHAWMUT 130A 130VAC SEMICONDUCTOR FUSE A13X130-4 *NEW*
LITTELFUSE CLASS RK5 TIME DELAY FUSE LOT OF 3 FLSR 6 1/4 100887
STANLEY 486230 1 AMP FUSE PC MOUNT LOT OF 2 NEW IN BAG
GENERAL ELECTRIC TYPE EJ-1 SIZE C 2400V FUSE 6193403G5 NEW
BUSSMANN IR10KA300VAC GMF-1/2 FUSETRON FUSES, LOT OF 5, NIB
RELIANCE 600VAC CLASS-RK5 FUSE LOT OF 3 ECSR 8-2/10
BUSSMANN LOW-PEAK LPJ-3SP 600 VAC/300 VDC 3 AMPS FUSES, LOT OF 2, NEW IN BAG
BUSSMANN 30A 250V SINGLE POLE FUSEHOLDER H25030-1S *LOT OF 6*
BUSSMANN GLR-2 300V FUSE, NIB - 1 BOX OF 5
GOULD SHAWMUT TRI-ONIC TRM5 TIME DELAY FUSE, LOT OF 2, NEW IN BAG
BUSS GBA-2 MINI FUSES, LOT OF 20, NEW IN BAG
S&C ELECTRIC REFILL UNIT FOR 200E AMP POWER FUSE, SM-4 *NEW*
BUSSMANN 1/2A MINI FUSE AGA 1/2 *NEW, LOT OF 10 BOXES *
RELIANCE 600VAC CLASS-RK5 FUSE LOT OF 3 ECSR 17-1/2
S&C SM-5 175A 7.2KV REFILL UNIT 131275R4 NIB
LIMITRON KTK- ASSORTMENT KTK-10 (2) AND KTK-15 (1) - LOT OF 3
BOX OF 10 COOPER BUSSMANN FUSETRON FUSES FNM-3-1/2 NEW
BUSSMANN 5A FAST ACTING EDISON BASE FUSE W-5 *NEW, BOX OF 4*
LITTLEFUSE 20A MINI FUSE 0MIN020.V *NEW*
BUSSMANN GLR 8 300V 8AMP FUSES, NIB- 1 BOX OF 5
AMP-TRAP DUAL ELEMENT TIME DELAY FUSE LOT OF 3 AJT2 8/10 100239
BUSSMANN 35A MINI FUSE AGC-3/8 *NEW, LOT OF 6*
BUSS 7.5 ATC FUSES ATC-7 1/2 *NEW BOX OF 5*
BUSSMANN 15A DUAL ELEMENT TIME DELAY FUSE T 15 *NEW, BOX OF 4*
BUSSMANN FRS-R-3 FUSETRON FUSE LOT OF 7 NEW
MARATHON 2-POLE FUSE HOLDER 6SC30A-1
BUSS-FUSETRON FRN-R-3 2/10, CLASS RK5 250V TYPE D FUSE, LOT OF 6
S&C POWER FUSE TYPE SM -5 REFILL UNIT 130150RA NIB
BUSSMANN 1A, 600V ONE-TIME FUSE NOS-1 *NEW, BOX OF 10*
LITTELFUSE 2AG 7A H225007, NIB - 1 BOX OF 95
COOPER BUSSMANN 4/10A MINI FUSE FNM-4/10 *NEW, BOX OF 10*
BUSSMANN FUSETRON FNA-R-3, CLASS RK 5 250V FUSE, LOT OF 6
BUSS FUSES ASSORTED, ABC-1 AND ABC-8, NIB - LOT OF 3 (EACH CONTAINS 5 FUSES)
BUSSMANN FUSETRON 6 1/4A DUAL ELEMENT TIME DELAY FUSE FRS-R-6 1/4 *NEW BOX OF 10
RELIANCE 600VAC CLASS-RK5 FUSE LOT OF 2 ECSR 1
BUSS-FUSETRON, FRS-R-1 8/10, CLASS RK5 600V FUSE, LOTS OF 6
LITTELFUSE CLASS RK1 TIME DELAY FUSE LOT OF 4 LLNRK 40 100851
BUSSMANN 60-30A 600V FUSE REDUCERS 663M *NEW, BOX OF 2*
BUSSMANN AGC-8 250 VOLTS 200 AMPS FUSES, PACK OF 5, NIB
LITTLEFUSE 250V SLO-BLO FUSE FLNR-8 *NEW, BOX OF 10*
GOULD 120VAC 3A PLUG FUSES GW3 *NEW LOT OF 2*
NELSON 1AMP, 5 x 20MM FUSE *NEW* LOT OF 43
BUSS FUSES ASSORTED - MDA 1, MDA 5, MDA 6-1/4, MDA 8, & MDA 10 - LOT OF 5
FERRAZ SHAWMUT TRM3-1/2, 3-1/2 A, 250V TRI-ONIC FUSES, NIB - 1 BOX OF 10
BUSS FUSES MDL 6-1/4, 250V - LOT OF 3 ( EACH CONTAINS 5 FUSES)