IC670CHS002Z
1.PLC的类型
PLC按结构分为整体型和模块型两类,按应用环境分为现场安装和控制室安装两类;按CPU字长分为1位、4位、8位、16位、32位、64位等。从应用角度出发,通常可按控制功能或输入输出点数选型。整体型PLC的I/O点数固定,因此用户选择的余地较小,用于小型控制系统;模块型PLC提供多种I/O卡件或插卡,因此用户可较合理地选择和配置控制系统的I/O点数,功能扩展方便灵活,一般用于大中型控制系统。
2.输入输出模块的选择
输入输出模块的选择应考虑与应用要求的统一。例如对输入模块,应考虑信号电平、信号传输距离、信号隔离、信号供电方式等应用要求。对输出模块,应考虑选用的输出模块类型,通常继电器输出模块具有价格低、使用电压范围广、寿命短、响应时间较长等特点;可控硅输出模块适用于开关频繁,电感性低功率因数负荷场合,但价格较贵,过载能力较差。输出模块还有直流输出、交流输出和模拟量输出等,与应用要求应一致。可根据应用要求,合理选用智能型输入输出模块,以便提高控制水平和降低应用成本。考虑是否需要扩展机架或远程I/O机架等。
3.电源的选择
PLC的供电电源,除了引进设备时同时引进PLC应根据产品说明书要求设计和选用外,一般PLC的供电电源应设计选用220VAC电源,与国内电网电压一致。重要的应用场合,应采用不间断电源或稳压电源供电。如果PLC本身带有可使用电源时,应核对提供的电流是否满足应用要求,否则应设计外接供电电源。为防止外部高压电源因误操作而引入PLC,对输入和输出信号的隔离是必要的,有时也可采用简单的二极管或熔丝管隔离。
4.存储器的选择
由于计算机集成芯片技术的发展,存储器的价格已下降,因此,为保证应用项目的正常投运,一般要求PLC的存储器容量,按256个I/O点至少选8K存储器选择。需要复杂控制功能时,应选择容量更大,档次更高的存储器。
BIT3 COMPUTER CORP /?SBS 465-201 SBUS PMC CARD - 84202322 (USED)
BIT3 COMPUTER CORP/?SBS 466-202 VME SUN?SBUS TO A32/D32 VMEBUS W/DMA CONTROLLER
BIT3 COMPUTER CORP/SBS 617-202 VME SUN SBUS TO A32/D32 VMEBUS W/ DMA CONTROLLER
BIT3 COMPUTER CORP/?SBS 412-101 VME SBUS?TO A32/D32 VMEBUS WITH DMA CONTROLLER
BIT3 COMPUTER CORP/?SBS 400-206 8MB DYNAMIC DUAL PORT RAM CARD - 82503180 (USED)
BIT3 COMPUTER CORP/?SBS 418-101 VME64 BUS REPEATER EXTENDER?MODULE - 84702215
BIT3 COMPUTER CORP/?SBS 403-202 IBM PC/AT TO A24/D16 VMEBUS?ADAPTER - 82002045
BIT3 COMPUTER CORP/?SBS 413-101 VME SBUS?TO A32/D32 VMEBUS WITH DMA CONTROLLER
BIT3 COMPUTER CORP/?SBS 400-204 2MB DYNAMIC RAM CARD - 82503160 (USED)
BUSTRONIC 101VMEM106 MONOLITHIC 6-SLOT VMEBUS BACKPLANE (USED)
BUSTRONIC 101PNGJ306 6-SLOT VME BACKPLANE (USED)
BYTE RUNNER PCI-800 8-PORT 9-PIN SERIAL 16550 UARTS PCI CARD WITHOUT CABLES-USED
BROOKTROUT TECHNOLOGY NS301+CP256DM-8P-AB NETWORK INTERFACE?& PACKET PROCESSING
BROOKTROUT TECHNOLOGY TR114+P2L 2 CHANNEL ANALOG FAX/VOICE PCI CARD(802-926-XXX)
BROOKTROUT TECHNOLOGY TRNIC-I24T 24 CHANNEL ANALOG FAX/VOICE?ISA CARD 802-922-XX
BROOKTROUT TECHNOLOGY TR114+14L (802-907-06B) 2 PORT 4 CHANNEL ANALOG FAX/VOICE
CASTELLE 81-0043-002 JETPRESS M10 10 BASE-T HP LJ5 JETDIRECT INTERNAL MODULE
CAMINTONN DHV11-16?16 LINES Q-BUS MUX -DEC DHV11 EQUIVALENT (USED)
CAMINTONN CMX-4200-48 48MB MEMORY (DEC MS650-XX EQUIVALENT)?MODULE (USED)
CAMINTONN CMV-504 2MB DUAL Q-BUS MODULE?(USED)
CAMINTONN CM-DRV11-WA 18/22-BIT GENERAL PURPOSE DMA INTERFACE (USED)
CLEARPOINT DCMEV40-00050 64MB MS670-CA EQUIVALENT MEMORY MODULE (USED)
CLEARPOINT DCMEV40-00095 32MB MS670-BA EQUIVALENT MEMORY MODULE (USED)
CMAC 8136-LG498-33-2 Q-BUS QUAD TEST MODULE (USED)
CMC 320080-03 6U VME MIL SPEC MODULE WITH DAUGHTER CARD 100156-32 (USED)
Cisco CVPN 3000 Concentrator
CISCO CVPN3002-8E (SET OF 2) VPN 3002 HARDWARE CLIENT WITH AC ADAPTER (USED)
CISCO DS-X9016 9000?SERIES 16-PORT 1/2?GBPS FC MODULE (USED)
Cisco PIX-515 Firewall
Cisco NM-8AM 8-Port?Analog Modem
CISCO DS-CAC-2500W MDS 9500 2500W POWER?SUPPLY (USED)
CISCO PIX-501 FIREWALL PIX SERIES P/N 47-10539-02 W/ AC ADAPTER P/N 341-0008-01
CMT GIGE-PMC-OPT SINGLE FIBER CHANNEL PMC MODULE (USED)
COGNEX CORP VM-5 DUAL Q-BUS MODULE (USED)
COLORGRAPHIC COMMUNICATIONS 602168 PRO LIGHTNING V+ 2 SVGA PORTS PCI MODULE
COLORGRAPHIC COMMUNICATION 602184 EVOLUTION 4 VGA 4 PORT MODULE (USED)
HP/COMPAQ StorageWorks SDLT 320 Tape Drive 257321-001 (USED)
COMPCONTROL CC-98 VMEBUS 1.05GB SCSI SINGLE HARD DRIVE (USED
COMPUTONE 3-01655-E PCI EX INTELLIPORT PCI MODULE (USED)
COMPUTONE 3-01835-A 16 PORTS INTELLIPORT II ISA-CEX MODULE (USED)
COMTROL CORP 5000004 ROCKET 8 PORTS RS422 PCI CARD (USED)
CMD CBI-1012/TM VAXBI-BUS DISK&TAPE DIFFERENTIAL (DAUGHTER PCF-1012-000 BOARD)
CMD CSV-8050/6 DUAL?6-PORT TRIDENT RAID?CONTROLLER MODULE W/FRONT CONTROL PANEL
CMD CQD-260/TMS QBUS?QUAD SCSI DISK AND?TAPE CONTROLLER MODULE (USED)
CMD CQD-243/TM QBUS?SCSI DISK AND TAPE CONTROLLER MODULE (USED)
CMD CRD-5440 4 CHANNEL VIPER II ULTRA SCSI RAID CONTROLLER?(USED)
CMD CDU-710-T UNIBUS?SCSI TAPE CONTROLLER MODULE (USED)
CYCLONE MICROSYSTEMS PMC-0359 (270-0359) ATM FIBER CARD (USED)
CYCLONE MICROSYSTEMS PMC55- 270-0355-02 ATM-OC3 USER NETWORK INTERFACE (USED)
CYCLONE MICROSYSTEMS PCI-983 FIBER PCI 64BIT SINGLE MEMORY SLOT MODULE- 270-0983
CYCLONE MICROSYSTEM CVME-965 MEZZANINE CARD W/OPTION VME MODULE 965-1009-408-21
DATABILITY LC-32-RS423 VCP1000 32 RJ45 PORTS MODULE - 500210103 D423/500220103
、
DATABILITY VCP/E-NIC VCP1000 ETHERNET INTERFACE MODULE 10BASET AND AUI PORTS
DATACUBE QVG-123 IMAGING QBUS PROCESSOR MODULE WITH AF-123 PIGGY-BACK MODULE
DATARAM 61994 [MSP01-BC 128MB = 4 X 32MB] MEMORY KIT (USED)
CSPI 2640 MULTICOMPUTER WITH DUAL RISC PROCESSORS, DUAL PORT?MYRINET NETWORK
CSPI 2641 MULTICOMPUTER WITH DUAL RISC PROCESSORS, DUAL PORT?MYRINET NETWORK
CSPI SC3XL/32MB SUPERCARD VMEBUS INTEL i860XP 50mhz ARRAY PROCESSOR BOARD
CSPI SC-2XL/16MB SUPERCARD VMEBUS INTEL?i860 40mhz ARRAY PROCESSOR BOARD
DATEL DVME-628 8 CHANNEL 12-BIT D/A VOLTAGE CONVERTER VMEBUS MODULE (USED)
DATEL DVME-601 16S/8D CHANNEL 12-BIT D/A DATA ACQUISITION W/CO-PROCESSOR VMEBUS
DATUM BC635VME 6U TIME/FREQUENCY PROCESSOR WITH TIME ON DEMAND, EVENT LOGGING
DATUM BC330VME 3U SERIAL TIME SIGNAL DECODER READER / PROCESSORS VMEBUS MODULE
DEVELOPMENT COCEPTS INCORPORATED (DCI) 791004-01 RS/5250 CONTROLLER CARD (USED)
DSRVW-ZA DEC SERVER?700 8 RS232 PORTS 2MB WITHOUT POWER SUPPLY
DTC03-AA DEC TALK III ENCLOSURE W/ POWER?SUPPLY (USED)
DEC 57-19400-04 / DCJ11-AC CPU FOR DEC PDP-11 (USED)
M8061 RLV12 Q-BUS RL01 / RLO2 DISK 22-BIT CONTROLLER
54-24327-01 ALPHASTATION 500/266 MOTHERBOARD (USED)
M7555 RQDX3 QBUS RD/RX CONTROLLER
M7740 KLESI-QA Q-BUS TO LESI BUS CONTROLLER
M7740-PA KLESI-SA S-HANDLE Q-BUS TO LESI BUS CONTROLLER
M7946 RXV11 Q-BUS RX01 CONTROLLER DUAL MODULE
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