1771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM7171771-P2模擬量模塊IC697MEM717
DCS是計(jì)算機(jī)技術(shù)、控制技術(shù)和網(wǎng)絡(luò)技術(shù)高度結(jié)合的產(chǎn)物,是目前*先進(jìn)、*合理的過程控制系統(tǒng),可以適應(yīng)各種過程控制的要求。它的過程控制點(diǎn)分散,系統(tǒng)具有很高的可靠性。它通過集中的操作和監(jiān)控,DCS具有方便的操作和維護(hù)性能。DCS具有標(biāo)準(zhǔn)的接口,對(duì)外連接更加方便簡(jiǎn)捷。DCS的主要特點(diǎn)歸結(jié)為一句話就是“分散控制,集中管理”。
DCS是怎么發(fā)展出來的?
DCS是在集中式控制系統(tǒng)的基礎(chǔ)上發(fā)展、演變而來。它是一個(gè)由過程控制級(jí)和過程監(jiān)控級(jí)組成的以通信網(wǎng)絡(luò)為紐帶的多級(jí)計(jì)算機(jī)系統(tǒng),綜合了計(jì)算機(jī),通信、顯示和控制等4C技術(shù)。隨著
自動(dòng)化水平不斷提高,DCS發(fā)展至今已相當(dāng)成熟和實(shí)用,是當(dāng)前工業(yè)自動(dòng)化系統(tǒng)應(yīng)用及選型的主流。
回顧DCS的發(fā)展之路,各個(gè)技術(shù)階段的劃分很重要的一點(diǎn)就是依仗微處理器的位數(shù)增加,有人甚至提出微處理器更新?lián)Q代一次,DCS技術(shù)就會(huì)升一級(jí)。DCS通常采用若干個(gè)控制器(過程站)對(duì)一個(gè)生產(chǎn)過程中的眾多控制點(diǎn)進(jìn)行控制,各控制器間通過網(wǎng)絡(luò)連接并可進(jìn)行數(shù)據(jù)交換。采用計(jì)算機(jī)操作站,通過網(wǎng)絡(luò)與控制器連接,收集生產(chǎn)數(shù)據(jù),傳達(dá)操作指令。因此,DCS技術(shù)必然隨著微處理器的技術(shù)不斷更新?lián)Q代以順應(yīng)新系統(tǒng)的需要。
DCS未來將沿著以下趨勢(shì)繼續(xù)發(fā)展:
(1) 向綜合方向發(fā)展:標(biāo)準(zhǔn)化數(shù)據(jù)通信鏈路和通信網(wǎng)絡(luò)的發(fā)展,將各種單(多)回路調(diào)節(jié)器、PLC、工業(yè)PC、NC等工控設(shè)備構(gòu)成大系統(tǒng),以滿足工廠自動(dòng)化要求,并適應(yīng)開放式的大趨勢(shì)。
(2) 向智能化方向發(fā)展:數(shù)據(jù)庫(kù)系統(tǒng)、推理機(jī)能等的發(fā)展,尤其是知識(shí)庫(kù)系統(tǒng)(KBS)和專家系統(tǒng)(ES)的應(yīng)用,如自學(xué)習(xí)控制、遠(yuǎn)距離診斷、自尋優(yōu)等,人工智能會(huì)在DCS各級(jí)實(shí)現(xiàn)。與FF現(xiàn)場(chǎng)總線類似,以微處理器為基礎(chǔ)的智能設(shè)備如智能I/O、PID控制器、傳感器、變送器、執(zhí)行器、人機(jī)接口、PLC相繼出現(xiàn)。
(3) DCS工業(yè)PC化:由IPC組成DCS已成為一大趨勢(shì),PC作為DCS的操作站或節(jié)點(diǎn)機(jī)已很普遍,PC-PLC、PC-STD、PC-NC等就是PC-DCS先驅(qū),IPC成為DCS的硬件平臺(tái)。
(4) DCS專業(yè)化:DCS為更適合各相應(yīng)領(lǐng)域的應(yīng)用,就要進(jìn)一步了解相應(yīng)專業(yè)的工藝和應(yīng)用要求,以逐步形成如核電DCS,變電站DCS、玻璃DCS、水泥DCS等。
"NEW" ALLEN BRADLEY DYNAMIC BRAKE CAT # 1336-MOD-KB101
Allen Bradley 1336 EBRF 10 AN EN Drive
ALLEN BRADLEY 1336-B075-EAH-FA2-L3 USPP 1336B075EAHFA2L
ALLEN BRADLEY 1336-B075-EAH-FA2-L3-S1 USPP 1336B075EAHF
ALLEN BRADLEY 1336-B075-EOH-FA2-L3-S1 USPP 1336B075EOHF
ALLEN BRADLEY 1336-MOD-KB010 NSFP 1336MODKB010
ALLEN BRADLEY SCR MODULE KIT 75-125 HP 1336, SP-140582
ALLEN BRADLEY 1336 FORCE DRIVE, 1336T-B007-AX-6T2EN-L6
Allen Bradley 1336 EBRF 30 AN EN Drive
New Allen Bradley 1336-MOD-KB010 Dynamic Brake
NEW ALLEN BRADLEY 1336-PB-SP10B PRECHARGE BOARD
ALLEN BRADLEY 1336 FORCE DRIVE
ALLEN BRADLEY 148294 REV.01 1336-MOD-L3
ALLEN BRADLEY #1336-MOD-KB010 DYNAMIC BRAKE PR5/FB
ALLEN BRADLEY MODEL 1336-MOD-KB005 DYNAMIC BRAKE LNC
ALLEN BRADLEY 1336-LA3
Allen Bradley 1336 Troubleshooting Guide, Parts Manual
ALLEN BRADLEY # 1336-L5 NEW IN THE FACTORY BOX
ALLEN BRADLEY 1336-CONV-SP17A NSFP 1336CONVSP17A
ALLEN BRADLEY 1336-GM2 USPP 1336GM2
ALLEN BRADLEY 1336-L4E NSFP 1336L4E
ALLEN BRADLEY 1336-L4E NSPP 1336L4E
ALLEN BRADLEY 1336-L5E NSPP 1336L5E
ALLEN BRADLEY 1336-L6 USPP 1336L6
ALLEN BRADLEY 1336-L7E NSFP 1336L7E
ALLEN BRADLEY 1336-R2-SP5A NSFP 1336R2SP5A
ALLEN BRADLEY 1336-RFB-150-D USPP 1336RFB150D
ALLEN BRADLEY 1336-RFB-7-A USPP 1336RFB7A
ALLEN BRADLEY 1336-L8E NSFP 1336L8E
ALLEN BRADLEY 1336-L9E NSFP 1336L9E
Allen Bradley 1336-L45 VDC logic terminal board NNB
ALLEN BRADLEY 1336-PB-SP10B USPP 1336PBSP10B
ALLEN BRADLEY 1336-B007-EOD-L1 NSPP 1336B007EODL1
ALLEN BRADLEY 1336-SN-SP4A NSFP 1336SNSP4A
ALLEN BRADLEY # 1336-L6 NEW IN THE FACTORY BOX
ALLEN BRADLEY 1336-MOD-KB005 DYNAMIC BRAKE UNIT NIB!!!
ALLEN BRADLEY 1336-MOD-KB005 5HP DYNAMIC BRAKE UNIT NEW
ALLEN BRADLEY 1336-151135 POWER SUPPLY**NIB**
ALLEN BRADLEY 1336-SCR-SP11A
NIB ALLEN BRADLEY 1336-MOD-KB010 DYNAMIC BRAKE SER. D
New Allen Bradley 1336-MOD-L2 24C Interface Option
ALLEN BRADLEY RENEWAL PARTS 1336-CAP-SP11A *NEW*
ALLEN BRADLEY BRAKING CHOPPER 1336-WB035 *NEW*
NEW ALLEN BRADLEY 1336-SCR-SP8A 1336 RENEWAL PARTS 575V
NEW ALLEN BRADLEY 1336-SCR-SP8A 1336 RENEWAL PARTS 575V
ALLEN BRADLEY CAPACITOR 1336-CAP-SP11A **NEW**
Allen Bradley 1336-WB035 Braking Chopper AB "NEW"
NEW ALLEN BRADLEY FUSE BUS 1336-F1-SP6A FOR 200HP DRIVE
NNIB ALLEN BRADLEY AB VFD #1336-B015-EAE-L3
ALLEN BRADLEY 1336-MOD-KB005 DYNAMIC BRAKE UNIT NEW
NEW ALLEN BRADLEY 1336-L9E DRIVE ACCESSORY 1336L9E
AB Allen Bradley 1336 151141 PC Board DR 75HP SP-151141
ALLEN BRADLEY 1336-MOD-L1
Allen Bradley 50HP 460V Board Cat# 1336-BDB-SP18D Used
ALLEN BRADLEY 1336-PB-SP2B POWER BOARD *XLNT*
ALLEN BRADLEY CAPACITOR 1336-CAP-SP11A **NEW**
ALLEN BRADLEY 120659 Co
nTROL BOARD 1336 3-200HP**NIB***
New ALLEN BRADLEY 1336-B010 AC DRIVE 1336B010ECDFC3L3
New ALLEN BRADLEY 1336-B015 15HP AC DRIVE 1336B015EAES1
New ALLEN BRADLEY 1336-B015 AC DRIVE 1336B015EAEL3S1
ALLEN BRADLEY 1336-MOD-KB005 *NIB* Dynamic Braker
NEW ALLEN BRADLEY 1336-BDB-SP34A GATE DRIVE BOARD 125HP
ALLEN BRADLEY 1336-MOD-N1 NEW IN FACTORY BOX
ALLEN BRADLEY 1336-KB010 DYNAMIC BRAKE USED
Allen Bradley PC Board Cat# 1336-PB-SP2D Used
Enlarge
New ALLEN BRADLEY 1336-WB110 Dynamic Brake Module
ALLEN BRADLEY 1336-MOD-KA010 NEW IN BOX
NEW ALLEN BRADLEY 1336-PB-SP9A SNUBBER BOARD 125HP 575V
ALLEN BRADLEY 1336-MOD-KB005 DYNAMIC BRAKE
ALLEN BRADLEY 151146 ba
se DRIVER BOARD 1336 3HP**NIB***
ALLEN BRADLEY 1336-B007-EAD DRIVE *NICE*
ALLEN BRADLEY 1336-MOD-KB005 DYNAMIC BRAKE
ALLEN BRADLEY 1336-MOD-KB005 DYNAMIC BRAKE
NEW!!! ALLEN BRADLEY 1336-MOD-G1 BCD SERIAL INTERFACE
Allen Bradley 1336-MOD-KB005 Dynamic Brake New
Allen-Bradley Precharge SCR Board 1336-135254 NEW
ALLEN BRADLEY 1336-MOD-KB005 DYNAMIC BRAKE NEW
Allen-Bradley Gate Driver Board 1336-BDB-SP3C NEW
Allen Bradley Dynamic Brake NEW # 1336-MOD-KB050 Ser D
ALLEN-BRADLEY 1336-L6 115VAC Co
ntrol Interface ! WOW !
ALLEN-BRADLEY 1336-L3 Co
ntrol Interface Option Kit NEW!
Allen Bradley 1336 Power supply board 20HP 151136
Allen Bradley Dynamic Brake 1336 # E0837300
Allen-Bradley 1336-MOD-KB005 Ser. D Dynamic Brake NNB