222015-52

222015-52

222015-52

222015-52

1．输入/输出单元

输入/输出单元通常也称I/O单元或I/O模块，是PLC与工业生产现场之间的连接部件。

PLC通过输入接口可以检测被控对象的各种数据，以这些数据作为PLC对被控制对象进行控制的依据；同时PLC又通过输出接口将处理结果送给被控制对象，以实现控制目的。

由于外部输入设备和输出设备所需的信号电平是多种多样的，而PLC内部CPU的处理的信息只能是标准电平，所以I/O接口要实现这种转换。

I/O接口一般都具有光电隔离和滤波功能，以提高PLC的抗干扰能力。另外，I/O接口上通常还有状态指示，工作状况直观，便于维护。

PLC提供了多种操作电平和驱动能力的I/O接口，有各种各样功能的I/O接口供用户选用。I/O接口的主要类型有：数字量（开关量）输入、数字量（开关量）输出、模拟量输入、模拟量输出等。

常用的开关量输入接口按其使用的电源不同有三种类型：直流输入接口、交流输入接口和交/直流输入接口。

常用的开关量输出接口按输出开关器件不同有三种类型：是继电器输出、晶体管输出和双向晶闸管输出。

继电器输出接口可驱动交流或直流负载，但其响应时间长，动作频率低；而晶体管输出和双向晶闸管输出接口的响应速度快，动作频率高，但前者只能用于驱动直流负载，后者只能用于交流负载。

PLC的I/O接口所能接受的输入信号个数和输出信号个数称为PLC输入/输出（I/O）点数。I/O点数是选择PLC的重要依据之一。当系统的I/O点数不够时，可通过PLC的I/O扩展接口对系统进行扩展。

2．通信接口

PLC配有各种通信接口，这些通信接口一般都带有通信处理器。

PLC通过这些通信接口可与监视器、打印机、其它PLC、计算机等设备实现通信。

PLC与打印机连接，可将过程信息、系统参数等输出打印；与监视器连接，可将控制过程图像显示出来；与其它PLC连接，可组成多机系统或连成网络，实现更大规模控制。

与计算机连接，可组成多级分布式控制系统，实现控制与管理相结合。远程I/O系统也配备相应的通信接口模块。

3．智能接口模块

智能接口模块是一独立的计算机系统，它有自己的CPU、系统程序、存储器以及与PLC系统总线相连的接口。

它作为PLC系统的一个模块，通过总线与PLC相连，进行数据交换，并在PLC的协调管理下独立地进行工作。

PLC的智能接口模块种类很多，如：高速计数模块、闭环控制模块、运动控制模块、中断控制模块等。

Detcon DM-5xx MicroSafe Gas Sensor

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Detect A Fire 32069 70'c 24v 100mA NK Type Test No. 85T622 Thermal Detector 2732

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DI232 Bachmann Digital input module

Diamond Antenna MS800 Handy Speaker Microphone

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Dinkle SPS-01303 Wiring Terminal Shielding 0838 With Cable WHM50/0.5M

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DIRECT LOGIC D2-08TR

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DISPLAY F069130500

Dixell XR70CX -5N1I3- Temperature Controller

DKK-TOA OBM-100

DL240CPU Automation Direct D2-240 CPU

DO232 Bachmann Digital Output Module

DOLAN JENNER LH-1100

Dold AA 9906.82 Time Relay Operate Delayed Minitimer

Domino Alpha 2 Frame Grabber 1161_A1_0

DOVER GA6520-10,GA6520-12

DOVER INSTRUMENT CORP ,VACUUM SPINDLE AIR S/N: 16702

DOVER INSTRUMENT CORP ENCODER BUFFER PCB ML15386-01

Dover Instrument S/N:22047

DP2-22F-P

DPSPL-AVR SR#5 PCB Board

DPT-C-S SER No.2406

DRAGER PAC 3500 O2 GAS MONITOR

Drager QuadGard Gas detection system Power supply Display & Circuit Boards

Drive DC2405M

DRIVER DFC5114P

DRS0025200036 Schoenrock Hydraulic Reversing Slide Valve Complete 265.10.00.162

DUAL VIDEO DIGITIZER JR P/N 300A1037 REV.D

Dukane Ultrasonic MADE IN USA 3501

DUKANE ULTRASONICS 110-3204

DUKANE ULTRASONICS 110-3680

DV-150 REFCO VACUUM GAUGE 9881862

Dwyer rma-7-ssv

Dynalco LMD120D Signal Power Digital Indicator

DYNAX Corporation 62AD-018

DYNETIC SYSTEMS B174685

E Dold & Sohne BA9042 Safe Master Relay Module

E. DOLD & SÖHNE KG AI905 Timer AI905.82

E. DOLD & SÖHNE KG Minitimer AA9906.82 Timer

E.Dold & Sohne BN5930.48 Emergency Stop Module A1+A2 DC 24V

E.Dold & Sohne KG BD5987.02/001 Safemaster BD5987

E.Dold AN5871 Insulation Monitor

E.Dold u. Sohne KG MK 9989.72/024 Timer Relay

E.O. Technics interface card P/N: 8170-735-511

E154554 SH-A94V-0,134D053-01-200-RS

E248779

E2S SONF1-HO 10 TONE SONORA SONF1DC24W-H

E2V Radar Component Performance Monitors B3RX1011

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EALEVEL Systems 7801 PCB COMM+8.PCI

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EAO 02-810.001 Buzzer

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Eaton FHF WeatherproResisTel Hazardous Area Headset

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EATON XSLOT RELAY 1018460

Eaton XSLOT RELAY AS/400 1018460

EBM R2E225-BD52-45 230v-50/60Hz Cooling Fan

Ebmpapst 3900 AC Axial Fans 115V

ebmpapst 614 NGN Fan, DC axial, 24VDC, 2,1w

EBRAIN 650-CPCI04

EBRAIN 650-VMOO3IS

ECI Power Inverter 730060 / Power Invertor N1660

ECKARDT 5982210 Electric Position Transmitter

Eclipse 5603 -22 Veri-Flame VF560322AA Flame Monitoring Control

ECO1000 SYSTEM SENSOR PHOTOELECTRIC SMOKE DETECTOR ECO1003 + BASE ECO1000B

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Edold & Sohne BN5930 48/204 Safemaster BN5930

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Edwards VS16K Adjustable Vacuum Switch - Range 30-1000

EEV Technologies B3JC1646 Radio Frequency Circulator

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