DSPC170 DSPC170 DSPC170
首先,DCS的骨架—系统网络,它是DCS的基础和核心。由于网络对于DCS整个系统的实时性、可靠性和扩充性,起着决定性的作用,因此各厂家都在这方面进行了精心的设计。对于DCS的系统网络来说,它必须满足实时性的要求,即在确定的时间限度内完成信息的传送。这里所说的“确定”的时间限度,是指在无论何种情况下,信息传送都能在这个时间限度内完成,而这个时间限度则是根据被控制过程的实时性要求确定的。因此,衡量系统网络性能的指标并不是网络的速率DCS,即通常所说的每秒比特数(bps),而是系统网络的实时性,即能在多长的时间内确保所需信息的传输完成。系统网络还必须非常可靠,无论在任何情况下,网络通信都不能中断,因此多数厂家的DCS均采用双总线、环形或双重星形的网络拓扑结构。为了满足系统扩充性的要求,系统网络上可接入的**节点数量应比实际使用的节点数量大若干倍。这样,一方面可以随时增加新的节点,另一方面也可以使系统网络运行于较轻的通信负荷状态,以确保系统的实时性和可靠性。在系统实际运行过程中,各个节点的上网和下网是随时可能发生的,特别是操作员站,这样,网络重构会经常进行,而这种操作**不能影响系统的正常运行,因此,系统网络应该具有很强在线网络重构功能。
其次,这是一种完全对现场I/O处理并实现直接数字控制(DDC)功能的网络节点。一般一套DCS中要设置现场I/O控制站,用以分担整个系统的I/O和控制功能。这样既可以避免由于一个站点失效造成整个系统的失效,提高系统可靠性,也可以使各站点分担数据采集和控制功能,有利于提高整个系统的性能。DCS的操作员站是处理一切与运行操作有关的人机界面(HMI-Human Machine Interface或operator interface)功能的网络节点。
NEW Powervision 113-C Cable TV Standby Power Supply
USED Allen Bradley PLC-5/40V Processor Unit PLC5 40V
USED Allen Bradley PLC-5/V80B Processor Unit PLC5 V80B
USED 4000 Amp Siemens RL4000 Breaker Static Trip 3 LSG
USED Allen Bradley 2711P-T12C4D2 PanelView Plus 1250 A
USED Westinghouse 300 kVA Dry Type Transformer 3 phase
2400 Delta HV 480 Y / 277 LV
Siemens I-T-E RD63F200 Sentron Series Breaker 2000 amps
225 KVA 13800 480 277 480Y GE Dry Transformer 3 Phase
USED Allen Bradley PanelView Plus 1250 2711P-T12C4D1
USED Bosch PSU 5100.100 L Inverter Module MFDC D-64711
Liebert SI025277YANDE Interceptor Surge Suppressor
NEW Giddings & Lewis NSM2304 M.1015.6949 Servo Motor
USED Perceptron 390-0049 Enna 17" Monitor 0520776002
NEW Xycom VME XVME-977 Hard / Floppy Drive Module
Repaired USED Allen Bradley 2711E-T14C6 PanelView 1400e
USED Repaired Allen Bradley 2711E-T14C6 PanelView 1400e
USED Allen Bradley 1756-L61/B ControlLogix Processor
USED Allen Bradley 2711E-T14C6 PanelView 1400e
NEW ABB 3HNM06855-1 Purge Sensor 3HNM 00272-1
XYCOM XVME-660 VME BUS XVME 660 XVME660 Intel USED
USED ABB 3HNM 01868-1 Hollow Wrist Attachment TR 5002
USED Allen Bradley 1756-L61S B GuardLogix Processor
NEW ABB Baumer 5692435L Feedback Unit PLSR 2XM0 / K10
NEW Xycom VME XVME-977 Hard / Floppy Drive Module
USED AC Tech M14300D MC Series Variable Inverter Drive
NEW Fanuc 0.5/6000 A06B-0115-B804 AC Servo Motor
USED Yaskawa CACR-IR 151515F B Servopack Servo Drive
NEW ABB 3HNM06855-1 Purge Sensor 3HNM 00272-1 .
USED Allen Bradley Complete Servo Motor System
2098-DSD-HV030-SE, MPL-B230P-VJ42AA, 1756-M0S3E
Sieb & Meyer 26.44.29 Sinudyn Brushless Motor System
150 Amp Square D Molded Case Circuit Breaker KC34150
USED SICK CLV490-2010 Optic Barcode Scanner CLV 490
USED Technifor UC200/E Marking Machine Controller UC200
800 Amp Square D Molded Case Circuit Breaker MH 36800
USED Allen Bradley 1785-L80B/E PLC5 Enhanced Controller
NEW Elwood Gettys M433-JCN0-0203 AC Servo Motor
USED Allen Bradley 2098-DSD-HV050X-DN Servo Drive V1.45
800 Amp Square D Molded Case Circuit Breaker MAP36800
USED Nordic 100 hp Soft Start Motor Controller 2364S00
Custom Enerpac Turbo w/ Enerpac Cylinder Press
600 Amp Westinghouse Circuit Breaker MA3800F 3 Pole
USED Siemens 4700-BDRMC3-11HN Panel Power Meter
Allen Bradley 2098-DSD-HV030 Ultra3000 Kinetix Drive
NEW Stearns 108705100EBF Self-Adjust Brake Assembly
400 Amp Square D Molded Case Circuit Breaker LHP36400MT
400 Amp Square D Molded Case Circuit Breaker LHP36400MT
REFURB Allen Bradley R2711-TC4X PanelView 1200 Terminal
Enerpac Enerpac Hydraulic Pump PEM 1521 PEM1521
NEW Norgren Herion 40892109000 Pressure Control Valve
USED Stanley AF-SERVO-040-001 Beta Servo Drive Unit
Lot of 37 Kromer Packers Zero Gravity Tool Balancer
USED Dillon SGMC Compression Load Cell 31915-0041
NEW Industrial Devices D2501B Cylinder Control Board
USED Allen Bradley 2711-K5A8 PanelView 550 Series F
USED Control Gaging Inc. Model 760 Grinding Monitor
USED SICK CLV490-0010 Optic Barcode Scanner CLV 490
USED Square D LC36600 Molded Case Circuit Breaker 600 A
Lakeland Parker Hydraulic Tube Bender 412 12x1-3/4mm
Lakeland Parker 400 Series Hydraulic Tube Bender 412
400 Amp Square D Circuit Breaker LAF 36400 32MVI027