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(yīng)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(qū)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(nèi);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(diào)度設(shè)計有關(guān)。新型的DCS控制器學(xué)習(xí)了大型PLC的設(shè)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(shè)置四個不同優(yōu)先級的任務(wù)，最小運算周期可以設(shè)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(shè)置在其它周期較長的任務(wù)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

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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)