描述
3HAC3462-1
DCS一般都提供統(tǒng)一的數(shù)據(jù)庫。換句話說,在DCS系統(tǒng)中一旦一個(gè)數(shù)據(jù)存在于數(shù)據(jù)庫中,就可在任何情況下引用,比如在組態(tài)軟件中,在監(jiān)控軟件中,在趨勢圖中,在報(bào)表中……而PLC系統(tǒng)的數(shù)據(jù)庫通常都不是統(tǒng)一的,組態(tài)軟件和監(jiān)控軟件甚至歸檔軟件都有自己的數(shù)據(jù)庫。為什么常說西門子的S7 400要到了414以上才稱為DCS?因?yàn)槲鏖T子的PCS7系統(tǒng)才使用統(tǒng)一的數(shù)據(jù)庫,而PCS7要求控制器起碼到S7 414-3以上的型號。從時(shí)間調(diào)度上來說。
PLC的程序一般不能按事先設(shè)定的循環(huán)周期運(yùn)行。PLC程序是從頭到尾執(zhí)行一次后又從頭開始執(zhí)行。(現(xiàn)在一些新型PLC有所改進(jìn),不過對任務(wù)周期的數(shù)量還是有限制)而DCS可以設(shè)定任務(wù)周期。比如,快速任務(wù)等。同樣是傳感器的采樣,壓力傳感器的變化時(shí)間很短,我們可以用200ms的任務(wù)周期采樣,而溫度傳感器的滯后時(shí)間很大,我們可以用2s的任務(wù)周期采樣。這樣,DCS可以合理的調(diào)度控制器的資源。從網(wǎng)絡(luò)結(jié)構(gòu)發(fā)面來說。
一般來講,DCS慣常使用兩層網(wǎng)絡(luò)結(jié)構(gòu),一層為過程級網(wǎng)絡(luò),大部分DCS使用自己的總線協(xié)議,比如西門子和ABB的Profibus、ABB的CAN bus、施耐德的Modbus等,這些協(xié)議均建立在標(biāo)準(zhǔn)串口傳輸協(xié)議RS232或RS485協(xié)議的基礎(chǔ)上?,F(xiàn)場IO模塊,特別是模擬量的采樣數(shù)據(jù)(機(jī)器代碼,213/掃描周期)十分龐大,同時(shí)現(xiàn)場干擾因素較多,因此應(yīng)該采用數(shù)據(jù)吞吐量大、抗干擾能力強(qiáng)的網(wǎng)絡(luò)標(biāo)準(zhǔn)?;赗S485串口異步通訊方式的總線結(jié)構(gòu),符合現(xiàn)場通訊的要求。IO的采樣數(shù)據(jù)經(jīng)CPU轉(zhuǎn)換后變?yōu)檎螖?shù)據(jù)或?qū)嵭螖?shù)據(jù),在操作級網(wǎng)絡(luò)(第二層網(wǎng)絡(luò))上傳輸。因此操作級網(wǎng)絡(luò)可以采用數(shù)據(jù)吞吐量適中、傳輸速度快、連接方便的網(wǎng)絡(luò)標(biāo)準(zhǔn),同時(shí)因操作級網(wǎng)絡(luò)一般布置在控制室內(nèi),對抗干擾的要求相對較低。因此采用標(biāo)準(zhǔn)以太網(wǎng)是最佳選擇。TCP/IP協(xié)議是一種標(biāo)準(zhǔn)以太網(wǎng)協(xié)議,一般我們采用100Mbit/s的通訊速度。PLC系統(tǒng)的工作任務(wù)相對簡單,因此需要傳輸?shù)臄?shù)據(jù)量一般不會(huì)太大,所以常見的PLC系統(tǒng)為一層網(wǎng)絡(luò)結(jié)構(gòu)。過程級網(wǎng)絡(luò)和操作級網(wǎng)絡(luò)要么合并在一起,要不過程級網(wǎng)絡(luò)簡化成模件之間的內(nèi)部連接。PLC不會(huì)或很少使用以太網(wǎng)。
產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢價(jià)格,大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌:ABB???,AB??,GE,FOXBORO,本特利,英維思,伍德沃德,西屋,瑞恩,施耐德,西門子,摩托羅拉,安川。力士樂。ACSO,橫河等進(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實(shí)力庫存商家
Brad Harrison TDN-8CO-108 Multi-Port System 2 Pcs
BRAD HARRISON CC4030A48M200 4P POWER QC M/F/ST 20M NEW
BRAD HARRISON 409P606-35 MPIS CABLE 409P60635 NEW
BRAD HARRISON CC4030A54M120 USPP CC4030A54M120
BRAD HARRISON SDS 8000 PASSIVE MPIS MINI 8-JUNCTION NEW
BRAD HARRISON 302000C03M120 NSPP 302000C03M120
BRAD HARRISON 302000C03M120 USPP 302000C03M120
BRAD HARRISON 47554 NSFP 47554
Brad Harrison #43321 4 Wire Saftey Receptacle (N) 5/4/1
BRAD HARRISON 4100C9W NSFP 4100C9W
BRAD HARRISON CC4030A47M310 USPP CC4030A47M310
BRAD HARRISON 409P606-35 MPIS CABLE 409P60635
BRAD HARRISON 47491 NSFP 47491
BRAD HARRISON DN11AM600 NSFP DN11AM600
BRAD HARRISON CC4030A47M050 NSFP CC4030A47M050
BRAD HARRISON 114030K12M380 4P MINI M/ST F/ST 38M NEW
BRAD HARRISON 712P801 MULTIPORT INTERCONNECT SYSTEM NIB
NIB BRAD HARRISON 712P601 MULTI-PORT SYSTEM
Expedited shipping available
NEW BRAD HARRISON 14030K12M380 CABLE ASSEMBLY 38M
Expedited shipping available
BRAD HARRISON 47554 USPP 47554
BRAD HARRISON 43321 USPP 43321
LOT OF 6 NEW BRAD HARRISON 43322 SAFETY-PLUGS RED
BRAD HARRISON DN11A-M500 DNET 5P MINI M/ST F/ST 50M NEW
BRAD HARRISON BTG899-FBP-10 NSFP BTG899FBP10
BRAD HARRISON CC4030A47M050 NSPP CC4030A47M050
BRAD HARRISON CC4030A54M033 NSPP CC4030A54M033
BRAD HARRISON DN8000 NSFP DN8000
Brad Harrison Top Mount 8 Outlet Connector DND8200
BRAD HARRISON 35607 NSFP 35607
BRAD HARRISON 228020A01F530 NSFP 228020A01F530
BRAD HARRISON E11A06002M760 4P CAT5E M/ST M/ST 76M NEW
BRAD HARRISON BTY801P-FBB 8 PORT PNP INTERCONNECT SYSTE
NEW BRAD HARRISON BTY801N-FBE-05 MULTI PORT BOX
BRAD HARRISON DN11A-M450 DEVICENET CORD 5P 45M NEW
LOT OF 33 ASSORTED BRAD HARRISON CABLES 12-22 AWG
BRAD HARRISON 47212 NSFP 47212
TDN-888-118 Brad Harrison DeviceNet Interconnect device
One-day shipping available
BRAD HARRISON DN8000 NSPP DN8000
CABLE JUNCTION DANIAL WOODHEAD BRAD HARRISON 803P801
BRAD HARRISON 47490 NSFP 47490
Brad Harrison MPIS 702P801 Multi-Port System new
BRAD HARRISON CC4030A48M060 4P POWER QC M/F/ST 6M NEW
(2) Brad Harrison 4 – port PNP connect BTY401P-FBC NEW
Brad Harrison Micro Change 12″ Cord NEW IN BAGS
Lot of 40
Enlarge
BRAD HARRISON 35773 NSFP 35773
BRAD HARRISON 4003 NSFP 4003
BRAD HARRISON DNDF22SS-M350 NSFP DNDF22SSM350
Brad Harrison 702P801
Brad Harrison 702P801 Multi-Port Interconnect System
BRAD HARRISON 47290 NSFP 47290
Brad Harrison 116020A01F300 Cordset NEW Free Ship
One-day shipping available
BRAD HARRISON 301000C11F500 NSFP 301000C11F500
BRAD HARRISON 23301 NSFP 23301
BRAD HARRISON DND8000 NSFP DND8000
BRAD HARRISON 5054-1 NSFP 50541
BRAD HARRISON 712P601 MULTIPORT INTERCONNECT SYSTEM NEW
BRAD HARRISON 47212 USPP 47212
BRAD HARRISON DN-PT3 NSFP DNPT3
BRAD HARRISON 332020A01F200 USPP 332020A01F200
Brad Harrison 409P495 Interconnect System NEW
One-day shipping available
BRAD HARRISON 35773 NSPP 35773
BRAD HARRISON 47289 NSFP 47289
BRAD HARRISON 47290 NSPP 47290
BRAD HARRISON 47290G NSPP 47290G
BRAD HARRISON 410P801 USPP 410P801
BRAD HARRISON 42884 NSFP 42884
BRAD HARRISON 1093-3 NSFP 10933
NIB BRAD HARRISON DN8000 DEVICENET PASSIVE MPIS
NEW Brad Harrison / Woodhead 8R3E06A18M0201 LOT OF 10
BRAD HARRISON 227020A01F300 7P MINI M/ST F/ST 30FT NEW
Brad Harrison MPIS Multi-Port System 712P601 new
One-day shipping available
BRAD HARRISON DN11A-M400 DEVICENET CORD 5P M/M 40M NEW
CABLE JUNCTION DANIAL WOODHEAD BRAD HARRISON 803P802
BRAD HARRISON 301000A01M060 10P MINI F/ST 6M NEW
BRAD HARRISON BTG899-FBP-05 NSFP BTG899FBP05
BRAD HARRISON BTY802P-FBP NSFP BTY802PFBP
BRAD HARRISON 43321 SAFETY PLUG 4-PIN ANGLED NEW!!
*SEALED* BRAD HARRISON Interconnect System 803P601 MPIS
One-day shipping available
*SEALED* BRAD HARRISON Interconnect System 410P601 MPIS
One-day shipping available
BRAD HARRISON 411P801 NSPP 411P801
BRAD HARRISON 702P801 NSFP 702P801
BRAD HARRISON 413P411 NSFP 413P411
BRAD HARRISON 410P801 MULTIPORT INTERCONNECT SYSTEM NNB
BRAD HARRISON 23302 NSFP 23302
BRAD HARRISON 332020K04M040 NSFP 332020K04M040
BRAD HARRISON 410P801 MULTIPORT INTERCONNECT New!
BRAD HARRISON 43321 NEW SAFETY PLUG 43321
BRAD HARRISON 409P801 MULTIPORT INTERCONNECT SYSTEM NEW
CABLE JUNCTION WOODHEAD BRAD HARRISON 332121B04M100
BRAD HARRISON 47288 NSFP 47288
New Brad Harrison Receptacle Safety Plug 43321 #29578
Brad Harrison 413P401 Interconnect System NEW
One-day shipping available
Brad Harrison Wiring Hub 8 Port PNP BTY802P-FBP NEW
BRAD HARRISON 301000C11F200 NSFP 301000C11F200
BRAD HARRISON 702P801 NSPP 702P801
BRAD HARRISON BTG899-FBP-05 USPP BTG899FBP05
Lot 2 Brad Harrison MPIS 409P801 Multiport Interconnect
NEW BRAD HARRISON 43321 SAFETY PLUG-RED 4P ANGLE RECEPT
Expedited shipping available
BRAD HARRISON 43321 ANGLED SAFETY PLUG 4 POLE * NIB
專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
PLC模塊,可編程控制器,CPU模塊,IO模塊,AI模塊,通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅
15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實(shí)力庫存商家