描述
开关量I/O接口可从传感器和开关(如按钮、限位开关等)及控制设备(如指示灯、报警器、电动机起动器等)接收信号。典型的交流输入/输出信号为24~240V,直流输入/输出信号为5~240V。尽管输入电路因制造厂家不同而不同,但有些特性是相同的,如用于消除错误信号的抖动电路等。此外,大多数输入电路在高压电源输入和接口电路的控制逻辑部分之间都设有可选的隔离电路。在评估离散输出时,应考虑熔丝、瞬时浪涌保护和电源与逻辑电路间的隔离电路。熔丝电路也许在开始时花费较多,但可能比在外部安装熔丝耗资要少。
(三)模拟量I/O
模拟量输入/输出接口一般用来感知传感器产生的信号。这些接口可用于测量流量、温度和压力,并可用于控制电压或电流输出设备。这些接口的典型量程为-10~+10V、0~+11V、4~20mA或10~50mA。一些制造厂家在PLC上设计有特殊模拟接口,因而可接收低电平信号,如RTD、热电偶等。一般来说,这类接口模块可用于接收同一模块上不同类型的热电偶或RTD混合信号。
(四)特殊功能I/O
在选择一台PLC时,用户可能会面临一些特殊类型且不能用标准I/O实现的I/O限定(如定位、快速输入、频率等)。此时用户应当考虑供销厂商是否提供有特殊的有助于最大限度减小控制作用的模块。有些特殊接口模块自身能处理一部分现场数据,从而使CPU从繁重的任务处理中解脱出来。
(五)智能式I/O
当前,PLC的生产厂家相继推出了一些智能式的I/O模块。一般智能式I/O模块本身带有处理器,可对输入或输出信号作预先规定的处理,并将处理结果送入CPU或直接输出,这样可提高PLC的处理速度并节省存储器的容量。
综上,表3归纳了选择I/O模块的一般规则。
欧美品牌停产的,常用的“PLC”备品备件
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1,《发电厂DCS监控系统》
2,《智能平钢化炉系统制造》
3,《PLC可编程输送控制系统》
4,《DCS集散控制系统》
5,《智能型消防供水控制系统》
6,《化工厂药液恒流量计算机控制系统》
7,《电气控制系统》造纸,印染生产线,变电站综合自动化控制系列
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OMRON G3PA-210B SOLID STATE RELAY
Lumonics Laser Interface SDT/EU Board PWB 2016047 REV A
RVSI 53115 REV K,61266 REV B,61263 REV A
CENTENT CNO165 HIGH RESOLUTION MICROSTEP DRIVE
FUJI 4800 VME-48316-32F Rev F Vision Processing Board
SUPER VEXTA UDK5128N 5-PHASE DRIVER
SunX DPX-410-IN Digital Pressure sensor
Sorensen DCS40-25E DC Power Supply 0-40V 0-25A
BERKELEY BXi 4 AXIS SERVO CONTROLLER BXi4/2-01-B
COGNEX VISION SYTEM IN-SIGHT-3400 Processor
ARCOM CONTROL PCIB40 40-Ch Digital I/O,Counter Board
Teknic SST-3000-829 Servo Drive M-5075-829 SERVO Motor
OMRON E5CS-Q1KJ TEMPERATURE CONTROLLER
WATLOW ANAFAZE CLS216 CONTROLLER
SunX DP2-42N Digital pressure Sensor
KEYENCE LX2-V10W PHOTOELECTRIC AMPLIFIER THRUBEAM LASER
OMRON H5F-KB Digital Daily 24hr Time Switch control
Omron Temerature Controller E5C3 WR20K E5C3-WR20K
FREE QUAD Ethernet Module p/n 110789
Watlow 989A-25CE-NERG Digital Temperature Controller
Lot of 2 Agilent 10467-68701 Microprobe set
CyberOptics PWA 5120218 Rev B Board
Agilent W2641A DisplayPort Test Point Access Adapter
Agilent U2122A 32I USB Digital I/O
CyberOptics PWA 5120089 Rev F Board
Intel D52657-303 PCIe Memory Expansion with 8GB FBDIMM
Agilent 86205A RF Bridge 50Ohm 300kHz to 6GHz
TAMAGAWA TBL-I SERIES AC SERVO MOTOR TS4509N3920E200
Omron Temperature Controller E5CN-R2MT-500 AC100-240V
MITUTOYO 10X/24 WIDEFIELD FOCUSING EYEPIECES 24mm
National Instruments NI SC-2062 8-Channel Relay Board
Lot of 2 MATSUSHITA NAIS FPO-C14RS PLC+FPO-E8RS
Advantech FPM-3150G-R 15 inch touch screen Flat Panel
Phoenix Contact MCR-SWS/U MCR-SWS Threshold Switch
Panasonic AC Servo Motor 1.0KW MSM102Q1C
FLOWLINE LR79326 ISOLATION RELAY LEVEL CONTROLLER
PRO-FACE GP37W2-BG41-24V TOUCHSCREEN GRAPHIC PANEL 24V
4 HP NC7170 Dual Port Gigabit Ethernet Card 313586-001
Yaskawa AC Servo Motor SGM-08AAF J12 750W 3000rpm
DELL Y8132 Poweredge 2950 Redundant PSU 750W N750P-S0
ADCOS VME-A100 K-100-VA
SONY SOMIC 68K VSP2 CAMERA/VIDEO CONTROLLER
Dell UF804 E1705 9400 M90 NVIDIA GeForce GO 7800″NEW”
Watec WAT-902B High Resolution CCD Camera
Omron S8VS-24024 10 Amp 24 VDC Power Supply
KEYENCE BL-185 BARCODE READER and BL-U2 POWER SUPPLY
MURR ELEKTRONIK 24V Power Supply MCS5-115-230/24 5A
Intel Core 2 Duo Mobile T9400 2.53Ghz/6MB/1066
Teli CS3730DC+1X65 lens+V-27R+Camera Holder
Watec WAT-505EX VISION CAMERA
Intel Core 2 Duo Mobile T7500 2.20Ghz/4MB/800
BOECKELER 1398 DIGITAL MICTROMETER POSITIONER HEAD
Agilent E2078-62101 CONN EXT HPIB GPIB Adapter
PowerCore CPCI-3750 Single Board CompactPCI®Computer
Symbol P370 P470 Cordless Scanner PS/2 cable P 370
Symbol P370 P470 Cordless USB Barcode Scanner Kit
MITUTOYO AT112 Linear Scales AT112-120 AT112-50
COGNEX IN-SIGHT 3400 ISS-3400-0 REV G with Full cable
Quickpanel Pro-Face GP370-LG21-24VP Touchdisplay
CISCO 10G BASE SR XENPAK TRANSCEIVER Module 10GB-SR
Opto 22 Classic Mistic G4LC32SXA Controller Processor
ZHONE MALC-G SHDSL-24
BK3110 KL1104 KL2134 DEVICENET BUS TERMINAL
FUJI TEAC TD-320A DIGITAL INDICATOR CONTROLLER
NEW HP 75000 Series C VT 1563A 800kSa/a 2 Ch Digitizers
AGILENT N2269A DAC 16-BIT DIG I/O MULTIFUNTION MODULE
Lot of 2 HP 10705A INTERFEROMETER 10704A RETROREFLECTOR
BALDOR ASR SERIES BTS10-5/10-24-RL-708 SERVO DRIVE
MITUTOYO LGB-110S LINEAR GAGE 542-401
MOTOROLA MCP750 VME Processor Module
SBS Technologies CP 6212 Universal Serial I/O
FORCE POWERCORE CPCI-690 CPCI 690 COMPACT PCI
Whedco DSP Motion Control IMJ-313E-X-D MTR-3N31 Motor
Galil 3-AXIS Motion Controller DMC-1030 DMC1030
FORCE POWERCORE CPCI-680 COMPACTPCI
COMPAQ 70-40453-01 U320 SCSI Bus I/O Controller
Dell 5U104 ATI VGA 64MB for Inspiron 5100 5150
SIEMENS 228246 card 210400 rev-f with 208000 rev-g
PEPPERL&FUCHS KFD2-SOT-EX2 Isolated Switch Amp qty=2
OMRON SYSMAC C60P Programmable Controller C60P-CDR-AE