DCS系統(tǒng)是繼
PLC之外的一大自動(dòng)化控制系統(tǒng)，它在化工、火電等領(lǐng)域的應(yīng)用極為廣泛，但是生產(chǎn)方面的自動(dòng)化技術(shù)需求進(jìn)一步提高，傳統(tǒng)的DCS系統(tǒng)已不能滿足需要，需要進(jìn)行技術(shù)升級(jí)。
DCS系統(tǒng)由多臺(tái)計(jì)算機(jī)分別控制生產(chǎn)過程中多個(gè)控制回路，同時(shí)又可集中獲取數(shù)據(jù)、集中管理和集中控制的自動(dòng)控制系統(tǒng)。分布式控制系統(tǒng)采用微處理機(jī)分別控制各個(gè)回路，而用中小型工業(yè)控制計(jì)算機(jī)或高性能的微處理機(jī)實(shí)施上一級(jí)的控制。
經(jīng)過這些年來的不斷應(yīng)用，DCS系統(tǒng)在行業(yè)發(fā)展的一些局限性逐步體現(xiàn)出來，DCS存在的問題：
①1對1結(jié)構(gòu)。1臺(tái)儀表，1對傳輸線，單向傳輸1個(gè)信號(hào)。這種結(jié)構(gòu)造成接線龐雜、工程周期長、安裝費(fèi)用高、維護(hù)困難。
②可靠性差。模擬信號(hào)傳輸不僅***度低，且易受干擾。為此采用各種措施提高抗干擾性和傳輸***度，其結(jié)果是增加了成本。
③失控狀態(tài)。操作員在控制室既不了解現(xiàn)場模擬儀表的工作狀況，也不能對其進(jìn)行參數(shù)調(diào)整，更不能預(yù)測事故，導(dǎo)致操作員對其處于失控狀態(tài)。因操作員不能及時(shí)發(fā)現(xiàn)現(xiàn)場儀表故障，而發(fā)生事故已屢見不鮮。
④互操作性差。盡管模擬儀表已統(tǒng)一4～20mA信號(hào)標(biāo)準(zhǔn)，可大部分技術(shù)參數(shù)仍由制造商自定，致使不同品牌儀表無法互換。因此導(dǎo)致用戶依賴制造廠，無法使用性能價(jià)格比***的配套儀表，甚至出現(xiàn)個(gè)別制造商壟斷市場的局面
TRUTZSCHLER ZPB 2 ZPB2 CIRCUIT BOARD CARD PLC MODULE 9 408-00.810.000 AG
TRUTZSCHLER ZPB 2 ZPB2 CIRCUIT BOARD 9 400-20.810.110 AE A-03-21-1 NEW
TRUTZSCHLER ZPB 2 ZPB2 CIRCUIT BOARD 9 400-20.810.110 AE A-03-21-1 NEW
Trutzschler ZPB 2 400-20.810.110AE
Trutzschler ZPB 2 400-20.810.110AE
Trutzschler SIB 3 (A1) Board ——#9
Trutzschler SIB 3 (A1) Board ——#9
TRUTZSCHLER SBG-1 SBG1 CIRCUIT BOARD CARD 9 493-37.230.000 AA 49337230000 AA
TRUTZSCHLER SBG-1 SBG1 CIRCUIT BOARD CARD 9 493-37.230.000 AA 49337230000 AA
Trutzschler RIB 1 490-18.330.000 Lifetime Warranty !!!
Trutzschler RIB 1 490-18.330.000 Lifetime Warranty !!!
TRUTZSCHLER PR-1 CIRCUIT BOARD CARD PLC 491-89.230.000 49189230000
TRUTZSCHLER PR-1 CIRCUIT BOARD CARD PLC 491-89.230.000 49189230000
Trutzschler power supply VNB 1 9 494-66.430.000 AB VNB1 949466430000 NEW 8 A 24V
Trutzschler power supply VNB 1 9 494-66.430.000 AB VNB1 949466430000 NEW 8 A 24V
Trutzschler Power Supply NTE 1 9 492-47.430.000 AF New
Trutzschler Power Supply NTE 1 9 492-47.430.000 AF New
Trutzschler PLC Control Station BRE 1C 493-55.332.000 Used
Trutzschler PLC Control Station BRE 1C 493-55.332.000 Used
TRUTZSCHLER KOM 1.2 1 CIRCUIT BOARD 492-40.230.002 492-40.431.000 492-40.230.001
TRUTZSCHLER KOM 1.2 1 CIRCUIT BOARD 492-40.230.002 492-40.431.000 492-40.230.001
TRUTZSCHLER KOM 1 CIRCUIT BOARD 492-40.230.001 492-40.431.000 492-40.230.002. 3A
TRUTZSCHLER KOM 1 CIRCUIT BOARD 492-40.230.001 492-40.431.000 492-40.230.002. 3A
Trutzschler KIB 1A 9 494-61.230.000 Lifetime Warranty !!!
Trutzschler KIB 1A 9 494-61.230.000 Lifetime Warranty !!!
TRUTZSCHLER GMB-1C GMB1C CIRCUIT BOARD CARD 9 494-58.332.000 AC 49458332000
TRUTZSCHLER GMB-1C GMB1C CIRCUIT BOARD CARD 9 494-58.332.000 AC 49458332000
TRUTZSCHLER GMB-1A-9-494-58.230.000 / GMB1A949458230000 (USED TESTED CLEANED)
TRUTZSCHLER GMB-1A-9-494-58.230.000 / GMB1A949458230000 (USED TESTED CLEANED)
TRUTZSCHLER GMB 1B CIRCUIT BREAKER Q067173 WITH HEAT BLOCK $149
TRUTZSCHLER GMB 1B CIRCUIT BREAKER Q067173 WITH HEAT BLOCK $149
Trutzschler Drive Motor - 1LA7166-4AA99-ZN15
Trutzschler Drive Motor - 1LA7166-4AA99-ZN15
Trutzschler Drive FU1 9 495-20.330.00 AA 9 494-70.019.501 Used
Trutzschler Drive FU1 9 495-20.330.00 AA 9 494-70.019.501 Used
TRUTZSCHLER DEG 1 9 494-00.330.000AA, I/O BLOCK CIRCUIT BOARD
TRUTZSCHLER DEG 1 9 494-00.330.000AA, I/O BLOCK CIRCUIT BOARD
Trutzschler DEG 1 9 494-00.330.000AA One Year Warranty !
Trutzschler DEG 1 9 494-00.330.000AA One Year Warranty !
TRUTZSCHLER DEG 1 9 494-00.330.000AA I/O BLOCK CIRCUIT BOARD NEW NOS $899
TRUTZSCHLER DEG 1 9 494-00.330.000AA I/O BLOCK CIRCUIT BOARD NEW NOS $899
Trutzschler DCB1 DCB 1 9 494-80.230.000 ABR28 494-16.210.001 AA
Trutzschler DCB1 DCB 1 9 494-80.230.000 ABR28 494-16.210.001 AA
TRUTZSCHLER CONTROL STATION BRE 1C, 9 493-55.332.000 AD
TRUTZSCHLER CONTROL STATION BRE 1C, 9 493-55.332.000 AD
TRUTZSCHLER CIRCUIT BOARD CARD RAK 1 9 492-58.430.000
TRUTZSCHLER CIRCUIT BOARD CARD RAK 1 9 492-58.430.000
TRUTZSCHLER CIRCUIT BOARD CARD PLC MODULE CCM-UE1 CCMUE1 9 491-91.230.000
TRUTZSCHLER CIRCUIT BOARD CARD PLC MODULE CCM-UE1 CCMUE1 9 491-91.230.000
TRUTZSCHLER CIRCUIT BOARD CARD PLC MODULE CCM-UE1 CCMUE1 491-91.230.000
TRUTZSCHLER CIRCUIT BOARD CARD PLC MODULE CCM-UE1 CCMUE1 491-91.230.000
TRUTZSCHLER CCM-NP1 CIRCUIT BOARD CARD PLC 491-88.230.000 49188230000
TRUTZSCHLER CCM-NP1 CIRCUIT BOARD CARD PLC 491-88.230.000 49188230000
TRUTZSCHLER BRE 1C_BRE1C CONTROL STATION_Z-NR: 9 493-55.332.00 AD
TRUTZSCHLER BRE 1C_BRE1C CONTROL STATION_Z-NR: 9 493-55.332.00 AD
TRUTZSCHLER BRE 1C CONTROL STATION 9097-90.900.906 AA
TRUTZSCHLER BRE 1C CONTROL STATION 9097-90.900.906 AA
TRUTZSCHLER BRE 1C CONTROL STATION ***XLNT***
TRUTZSCHLER BRE 1C CONTROL STATION ***XLNT***
TRUTZSCHLER BRE 1C CONTROL STATION
TRUTZSCHLER BRE 1C CONTROL STATION
TRUTZSCHLER BOARD GMB-1A-9-494-58.230.000
TRUTZSCHLER BOARD GMB-1A-9-494-58.230.000
TRUTZSCHLER BIS 1C RELAY 490-93.334.000 49093334000
TRUTZSCHLER BIS 1C RELAY 490-93.334.000 49093334000
TRUTZSCHLER BIS 1 TYPE A RELAY 490-93.330.000 49093330000
TRUTZSCHLER BIS 1 TYPE A RELAY 490-93.330.000 49093330000
Trutzschler 492 47 430 000 NTE1 Supply
Trutzschler 492 47 430 000 NTE1 Supply
