1C0577

1C0577

1C0577

(3) 适合于在恶劣环境下工作，能抗电源干扰、雷击干扰、电磁干扰和低电位差干扰。

(4) 分层结构，为适应DCS的分层结构，其通讯网络也必须具有分层结构，如分为现场总线，车间级网络系统，工厂级网络系统等不同层次。

3、通讯网络的分级体系

早期的DCS系统的通讯网络都是专用的，DCS有几级网络，完成不同模件之间的通讯。从目前的情况来看，DCS的最多网络级有四级，它们分别是I/O总线、现场总线、控制总线和DCS网络。

(1) I/O总线

它把多种I/O信号送到控制器，由控制器读取I/O信号，I/O模件之间并不交换数据。I/O总线包括并行总线和串行总线。I/O总线的传输速率是不高的，从几十K到几兆不等，为了快速，最好是并行总线。采用并行总线，其I/O模件必须与控制器模件相邻。若采用串行总线，I/O模件和控制器之间的距离也要比较近才行。通常把控制器模件和I/O模件装在一个机柜内或相邻的机柜内。

(2) 现场总线

现场总线是90年代初发展起来的，远程I/O应该采用现场总线，如CAN、LONWORKS、HART总线等。在DCS系统中，远程I/O采用HART总线比较多。比如现场的变送器，距离控制器机柜比较远，常把16个变送器来的信号编成一组，用HART总线把信号送到控制器，控制器同时读进16个变送器来的信号。采用现场总线，控制器和变送器两者距离可达1公里以上。

ABB 1SCA022736R8840 TERMINAL SHROUD *NEW INFACTORY BAG*

ABB 1SCA022736R8840 TERMINAL SHROUD *NEW INFACTORY BAG*

ABB INTERCONN. BAR BES185-30 1SFN084704R1000 *NEW IN BAG*

ABB INTERCONN. BAR BES185-30 1SFN084704R1000 *NEW IN BAG*

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ABB 3HAB 8208-1/04 Modul DSQC 328

ABB 88T501 GJR2356900R1100

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ABB Part# 3HAC14940-1 Axis 1-4 cableharness on Irb 6600s

ABB 89NG05 GJR23421000R2

ABB - IRC5 Controller Panel Board DSQC 643- 3HAC024488-001

ABB Leitungsschutzschalter S 263- C32

ABB / BBC Veritron Stromrichter Typ: GCB0591 Nr. 9043179

ABB DCS 600 (1400HP) DC MOTOR DRIVETYPE:DCS601-1500-61-15000A0 600VAC PH:3 USED

ABB SLC Controller w/ LCD Display: SLC01,SLC02, SLC21, & more.

ABB Sace Tmax T1N Circuit breaker 3-polig40A

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ABbaseA connection drive unit drive boardcard DSTA 150A DSTA-150A 57160001-UH

ABB 24V Fan assy.Part# 3HAC6658-1

ABB 24V Fan assy.Part# 3HAC6658-1

ABB BAILEY INFI90 HARMONY / INFI 90 BRIDGEConTROLLERS INLIM03 & INBIM02

ABB BAILEY INFI90 HARMONY / INFI 90 BRIDGEConTROLLERS INLIM03 & INBIM02

ABB DRIVE ACS401600632 380 - 480VACS401600632

ABB DRIVE ACS401600632 380 - 480VACS401600632

ABB A9-30-01 Contactor Schütz1SBL141001R8101 24V 50/60Hz

ABB A9-30-01 Contactor Schütz1SBL141001R8101 24V 50/60Hz

ABB-LOT OF 8-NEW

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ABB 5714012-AK 2668171-73/1 ASEA MODULECARD ASSEMBLY PCB CIRCUIT BOARD

ABB 3HAA0001-ADY/1 3HAA0001-ADX/1 OperatorInterface

ABB 88FT05C-E GJR2393100R1200

ABB 88FT01D GJR2332200R0100

ABB MOTORS MT9UL-4F115 CLASS F *NEW NO BOX*

ABB MOTORS MT9UL-4F115 CLASS F *NEW NO BOX*

ABB / STROMBERG SAMC 7 REL 57172509 / ABB /STROMBERG SAMC7 REL 57172509LE

ABB 042L017-23 KIT *FS*

ABB 042L017-23 KIT *FS*

ABB, ANALOG INPUT,P70820-4-0369031GEBRAUCHT

ABB TAL16-30-10 ConTACTOR 1SBL183061R5410

ABB TAL16-30-10 ConTACTOR 1SBL183061R5410

ABB 3BHT 300055 R1 CI-10 card

Refurbished Sharp LM32K101 LCD. ORIGINAL!Tested. ABB TEACH PENDANT. S4 S4C S4C+

NEW ABB TA75DU52 OVERLOAD TA75 DU 52

ALLEN BRADLEY 1326AB-B515G-21-K5 SER.C ACSERVO MOTOR *NEW IN BOX*

ALLEN BRADLEY 1326AB-B515G-21-K5 SER.C ACSERVO MOTOR *NEW IN BOX*

ABB G10CTX170 Flat Panel Operator InterfaceRev. A

ABB DSQC 212 Monitor Display BoardYB560103-AP/4

ABB 129A539G01 Switch Assembly