手機(jī)號
未認(rèn)證執(zhí)照
黃工(先生)
普通會(huì)員
黃工 (先生)
abb cp502
abb ypk112a
plc控制和dcs控制系統(tǒng)不是一個(gè)邏輯層次上的概念,從名稱上就能看出:plc是以功能命名,dcs是以體系結(jié)構(gòu)命名。從原理上看plc就可以組成dcs。當(dāng)然兩者性能差異還是存在的,要具體看產(chǎn)品和需要。從應(yīng)用角度來說,簡單地以plc,dcs來區(qū)分,往往會(huì)走人誤區(qū)。
dcs控制系統(tǒng)與plc控制區(qū)別:dcs是一種“分散式控制系統(tǒng)”,而plc(可編程控制器)只是一種控制“裝置”,兩者是“系統(tǒng)”與“裝置”的區(qū)別。系統(tǒng)可以實(shí)現(xiàn)任何裝置的功能與協(xié)調(diào),plc裝置只實(shí)現(xiàn)本單元所具備的功能。
dcs網(wǎng)絡(luò)是整個(gè)系統(tǒng)的中樞神經(jīng),dcs系統(tǒng)通常采用的國際標(biāo)準(zhǔn)協(xié)議tcp/ip。它是安 全可靠雙冗余的高速通訊網(wǎng)絡(luò),系統(tǒng)的拓展性與開放性更好.而plc因?yàn)榛旧隙紴閱蝹�(gè)小系統(tǒng)工作,在與別的plc或上位機(jī)進(jìn)行通訊時(shí),所采用的網(wǎng)絡(luò)形式基本都是單網(wǎng)結(jié)構(gòu),網(wǎng)絡(luò)協(xié)議也經(jīng)常與國際標(biāo)準(zhǔn)不符。在網(wǎng)絡(luò)安 全上plc沒有很好的保護(hù)措施。
dcs整體考慮方案,操作員站都具備工程師站功能,站與站之間在運(yùn)行方案程序下裝后是一種緊密聯(lián)合的關(guān)系,任何站、任何功能、任何被控裝置間都是相互連鎖控制,協(xié)調(diào)控制;而單用plc互相連接構(gòu)成的系統(tǒng),其站與站(plc與plc)之間的聯(lián)系則是一種松散連接方式,做不出協(xié)調(diào)控制的功能。
dcs在整個(gè)設(shè)計(jì)上就留有大量的可擴(kuò)展性接口,外接系統(tǒng)或擴(kuò)展系統(tǒng)都十分方便,plc所搭接的整個(gè)系統(tǒng)完成后,想隨意的增加或減少操作員站都是很難實(shí)現(xiàn)的。
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sun hydraulics dby 9cv5 manifold hydraulic valve b444786
bosch 0 811 101 218 hydraulic pressure 4500psi directional control valve b206763
parker r6vh el adjustable directional control hydraulic valve b322290
sun hydraulics dbq 9kd6 aluminum regulator flow control hydraulic valve b461059
sun hydraulics dby 9hi5 aluminum sandwich manifold hydraulic valve b444609
abex 415-1398 77111 jet-pipe 10gpm hydraulic servo valve d516116
vickers dgmpc-5-abk-30 systemstak pilot 15.7gpm check hydraulic valve b461190
vickers cge 02 3 21 remote electrically relief hydraulic valve d468530
vickers xg 06 2b 30 reducing pressure control hydraulic valve d472552
versa tgg-4322-g-h-z5?00 solenoid 120v-ac 12w directional hydraulic valve b396823
vickers paog454l 120v-ac solenoid hydraulic valve d456970
deltrol c30b pneu-trol 2000psi brass 8gpm threaded check hydraulic valve b418245
rexroth dz 30-1-52/200xm/1?2 directional control hydraulic valve b407173
parker 0326 hold 2500psi cartridge hydraulic valve b486885
vickers dgmpc-5p-abk-30 pilot operated 15.7gpm check hydraulic valve b461251
parker d1vw20bnypf 75 120v-ac pilot directional control hydraulic valve b429180
vickers dgmfn 5 y aw bw 20 flow control hydraulic valve d457068
vickers rg 06 a3 30 80-250psi 30gpm pressure control hydraulic valve b430785
parker d3w4cnyp 14 120v-ac 0-20gpm directional control hydraulic valve b438590
vickers dgmpc-5p-abk-30 pilot operated directional check hydraulic valve b413642
vickers xt 03 3f 30 reducing threaded pressure control hydraulic valve d457441
sun hydraulics dby 9ed6 threaded manifold hydraulic valve b438776
sun hydraulics dby 9dy6 threaded manifold hydraulic valve b438766
moog g761-3600 hydraulic servo valve d512161
parker 332508 14x2636 columbia 3000 psi 120v-ac hydraulic solenoid valve d461146
nachi ss-g03-c9-r-c11?5-e21 115v-ac solenoid hydraulic valve d457580
integrated cxp7587 hydraulics aluminum body 3000psi cartridge valve b206555
nachi ss-g01-c7y-r-c1?15-e310 directional control hydraulic valve b417983
sun hydraulics gby 9iw6 sandwich nccb lcn body manifold hydraulic valve b429219
sun hydraulics ckeg scn 30psi relieving cartridge hydraulic valve b243039
sun hydraulics dby 9in5 aluminum sandwich 12gpm manifold hydraulic valve b438636
oilgear vp20-20 servocontrol r717414-004 hydraulic servo valve d513401
voac 3190-24dc solenoid hydraulic valve d399969
miller fluid power 583-dbec0-0021-?l03 115v-ac hydraulic solenoid valve d498182
nachi ocf-g01-w40-y-3?0 flow control modular hydraulic valve d457633
hyster 0290921 parker hf30888-3 divider flow manifold hydraulic valve b410743
magnet schultz ch-09454-001 pilot valve 24-v-dc solenoid hydraulic valve b399589
sun fccb xan pressure reducing cartridge 3.50gpm hydraulic valve b302399
hagglunds denison 026-27310 proportional directional control valve b298380
assalub gd22ss manifold dual line lubrication doser cartridge valve b410190
nachi ocf-g03-w60-y-j?50 5.3-15.8gpm flow control hydraulic valve d464451
primary fluid systems tvbp25-pp back pressure control hydraulic valve b427199
edi vcd-ru-38 threaded flow control hydraulic valve d418886
vickers 400823 flanged solenoid hydraulic valve d472553
bosch 0 811 402 607 proportional 315bar cartridge flanged valve b208609
sun hydraulics fccb xan relieving cartridge 4.25gpm hydraulic valve b243046
moog 72-101a l-55982 servo hydraulic valve d467954
rexroth lfa32wea54-63/p?20 directional hydraulic control cartridge valve b201753
sun hydraulics xeoa xxn cavity plug 30-35 lb/ft 45-50nm hydraulic valve b406729
deltrol f30b threaded needle hydraulic valve d454787
vickers solenoid hydraulic valve 120v-ac d460487
sun hydraulics dbb threaded hydraulic valve sandwich manifold d403165
deltrol f30b threaded needle hydraulic valve d454787
sun hydraulics csab-xxn ball shuttle 2.5gpm cartridge hydraulic valve b443804
sun hydraulics pbjb-lbn pressure reducing cartridge hydraulic valve b315264
sun hydraulics cxda xan control check 20gpm cartridge hydraulic valve b443778
moog d663e775b d061-724c servo hydraulic valve d445378
sun hydraulics ppfb lan reducing/reliev?ing cartridge hydraulic valve b278114
sun hydraulics cba threaded hydraulic valve sandwich manifold d403172
vickers xct-06-06b-20 100-3000psi reducing pressure control valve b411046
sun hydraulics nqed-xbn 45-50 lbf ft 4.00gpm cartridge hydraulic valve b443856
sun hydraulics ppdb lbn reducing/reliev?ing cartridge threaded valve b278151
moog 760-851 threaded servo hydraulic valve d467352
sun hydraulics cbia-lhn standard capacity counterbalance hydraulic valve d456190
sun hydraulics pbhb lqn pilot operated 40gpm cartridge hydraulic valve b438768
sun hydraulics pbhb lqn pilot operated 40gpm cartridge hydraulic valve b444022
sun hydraulics cbgh ldn counter balance 60gpm cartridge hydraulic valve b443793
parker mpr600sp control base manifold hydraulic valve b220656
moog 760-851a servo hydraulic valve d467418
caterpillar cat 177-4767-e group pilot steering cut-in cartridge valve b486733
vickers dgmx25ppcw21 reducing module pressure control hydraulic valve d456987
moog 72-101a servo hydraulic valve d456948
moog a076-185 servo hydraulic valve d513555
vickers 880024 pbdg4s4l 016c b 60 insta-plug directional control valve d473111
yuken dshg-06-3c60-at?20-3590 kogyo directional control hydraulic valve b244565
toyooki kogyo solenoid directional control hydraulic valve b427682
vickers cge 02 3 21 remote electrically modulated relief hydraulic valve d457073
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