福建中立恒自动化设备有限公司

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系统也必须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。

以下链接皆有货

ALLEN BRADLEY 1734-FPD POINT I/O UNIVERSAL VOLTAGE DIST MODULE SER: B

ALLEN BRADLEY 1734-IB4 POINT I/O 4 CH 24VDC SINK DIGITAL INPUT MODULE SERIES D

ALLEN BRADLEY 1734-IB8S

ALLEN BRADLEY 1734-IB8S POINT DIGITAL INPUT MODULE 24VDC 8-CH SINK SAFETY SER:A

ALLEN BRADLEY 1734-IB8S POINT DIGITAL INPUT MODULE 24VDC 8-CH SINK SAFETY SER:B

ALLEN BRADLEY 1734-IE2C C (We have more in stock need more contact us)

ALLEN BRADLEY 1734-MB

ALLEN BRADLEY 1734-MB (We have more in stock need more contact us)

ALLEN BRADLEY 1734-MB POINT I/O MOUNTING BASE SER: A

ALLEN BRADLEY 1734-OB4 POINT I/O 4 CHANNEL 24VDC DIGITAL OUTPUT MODULE SER: C

ALLEN BRADLEY 1734-OB8S POINT I/O OUTPUT MODULE 8CH SINK SAFETY SOURCING SER.A

ALLEN BRADLEY 1734-OB8S POINT I/O OUTPUT MODULE 8CH SINK SAFETY SOURCING SER.B

ALLEN BRADLEY 1734-OW2 POINT I/O DIGITAL RELAY SINK/SOURCE OUTPUT MODULE SER.C

ALLEN BRADLEY 1745-TCAT

ALLEN BRADLEY 1746-A10

ALLEN BRADLEY 1746-A10 SLC500 10 SLOT CHASSIS, SERIES B

ALLEN BRADLEY 1746-A13 SLC500 13 SLOT CHASSIS RACK, SERIES B

ALLEN BRADLEY 1746-A4 SLC500 4 SLOT MODULAR CHASSIS RACK, SERIES A

ALLEN BRADLEY 1746-A7

ALLEN BRADLEY 1746-HSCE2

ALLEN BRADLEY 1746-HSTP1

ALLEN BRADLEY 1746-IA16 SLC500 16 CHANNEL AC DIGITAL INPUT MODULE, SERIES C

ALLEN BRADLEY 1746-IB16

ALLEN BRADLEY 1746-IB16 SLC500 16 CHANNEL DC DIGITAL INPUT MODULE, SERIES C

ALLEN BRADLEY 1746-IB32 SLC500 PLC I/O MODULE, 32 INPUTS, 24VDC, SERIES D

ALLEN BRADLEY 1746-IB8 SLC 500 8 POINT INPUT MODULE SERIES A

ALLEN BRADLEY 1746-IG16 SLC500 16-CHANNEL DIGITAL DC INPUT MODULE 5VDC TTL/BCD

ALLEN BRADLEY 1746-IO12DC SLC500 12 CHANNEL COMBINATION MODULE I/O, SERIES A

ALLEN BRADLEY 1746-ITB16

ALLEN BRADLEY 1746-IV16

ALLEN BRADLEY 1746-NI16I SLC500 MULTI-CLASS ANALOG CURRENT INPUT MODULE, SER:A

ALLEN BRADLEY 1746-NI4 SLC500 HIGH RESOLUTION ANALOG INPUT MODULE 4 POINT, SER:B

ALLEN BRADLEY 1746-NI4 SLC500 HIGH RESOLUTION ANALOG INPUT MODULE 4 POINT, SER:A

ALLEN BRADLEY 1746-NI8

ALLEN BRADLEY 1746-NI8 SLC500 HIGH DENSITY CONFIGURABLE ANALOG INPUT MODULE,SR:A

ALLEN BRADLEY 1746-NO4I SLC500 ANALOG CURRENT OUTPUT MODULE, SERIES A

ALLEN BRADLEY 1746-OA8 SLC500 AC OUTPUT MODULE 8X 120/240V AC OUTPUTS, SERIES B

ALLEN BRADLEY 1746-OB16

ALLEN BRADLEY 1746-OW16 SLC500 PLC I/O MODULE, 8 OUTPUTS, SERIES D

ALLEN BRADLEY 1746-OX8 SLC500 OUTPUT MODULE, ISOLATED RELAY, SERIES A

ALLEN BRADLEY 1746-P1 SLC500 POWER SUPPLY, RACK MOUNT, 120/240VAC, 2A, SERIES A

ALLEN BRADLEY 1746-P2

ALLEN BRADLEY 1746-P2 SLC500 POWER SUPPLY, RACK MOUNT, 120/240VAC, 5A, SERIES C

ALLEN BRADLEY 1746-P4 SLC500 POWER SUPPLY, RACK MOUNT, 120/240VAC, SERIES A

ALLEN BRADLEY 1746-RT25B

ALLEN BRADLEY 1747-AIC SLC500 DH485 LINK COUPLER, SERIES B

Allen Bradley 1747-DTAM

ALLEN BRADLEY 1747-KFC15 CONTROLNET RS-232 INTERFACE MODULE SERIES:A F/W REV 1.7

ALLEN BRADLEY 1747-L532 SLC 5/03 CPU PROCESSOR,16K MEMORY,DH-485 & RS-232,SER.E

ALLEN BRADLEY 1747-L532 SLC 5/03 CPU PROCESSOR,16K MEMORY,DH-485 & RS-232,SER.D

Allen Bradley 1747-L541

ALLEN BRADLEY 1747-L542

ALLEN BRADLEY 1747-L551

Allen Bradley 1747-L553

ALLEN BRADLEY 1747-SDN

ALLEN BRADLEY 1747-SDN SLC500 DEVICENET SCANNER MODULE, SLC 5/02 OR LATER,SER.D

ALLEN BRADLEY 1747-SN SLC500 REMOTE I/O SCANNER MODULE, SERIES B

ALLEN BRADLEY 1753-IB20XOB8 GUARD PLC DISTRIBUTED I/O, 20 DC INPUTS, 8 DC OUTPUT

ALLEN BRADLEY 1756-A13 13 SLOT CONTROLLOGIX CHASSIS, SERIES B

ALLEN BRADLEY 1756-CNB CONTROL NET COMMUNICATIONS BRIDGE, SER.D, F/W REV.5.38.40

ALLEN BRADLEY 1756-CNBR CONTROL LOGIX CONTROLNET REDUNDANT BRIDGE MODULE SER:E

ALLEN BRADLEY 1756-CNBR CONTROL LOGIX CONTROLNET REDUNDANT BRIDGE MODULE, SER:E

ALLEN BRADLEY 1756-CNBR CONTROL LOGIX CONTROLNET REDUNDANT BRIDGE MODULE, SER:D

ALLEN BRADLEY 1756-CPR2 CONTROLLOGIX REDUNDANT POWER SUPPLY CABLE, SERIES A

ALLEN BRADLEY 1756-EN2TR CONTROL LOGIX ETHERNET/IP INTERFACE MODULE SERIES B

Allen Bradley 1756-ENBT

ALLEN BRADLEY 1756-ENBT CONTROL LOGIX ETHERNET/IP BRIDGE MODULE, SERIES A

ALLEN BRADLEY 1756-IB16 CONTROLLOGIX 10-31VDC INPUT MODULE 16 POINTS, SER:A

ALLEN BRADLEY 1756-IB32 CONTROLLOGIX DIGITAL DC INPUT MODULE 32 SINK INPUT,SER:B

ALLEN BRADLEY 1756-IF16 CONTROLLOGIX 16 CURRENT/VOLTAGE ANALOG INPUT MODUL SER:A

ALLEN BRADLEY 1756-IF6CIS CONTROL LOGIX ANALOG INPUT MODULE 6 POINT 20 PIN SER:A

ALLEN BRADLEY 1756-IF8 CONTROLLOGIX ANALOG INPUT MODULE,CURRENT/VOLTAGE,SERIES A

ALLEN BRADLEY 1756-IR6I CONTROLLOGIX ISOLATED RTD INPUT MODULE, 6 POINT,SERIES A

ALLEN BRADLEY 1756-L1 CONTROLLOGIX PROCESSOR UNIT + 1756-M1/A MEMORY EXPANSION

ALLEN BRADLEY 1756-L1 CONTROLLOGIX PROCESSOR UNIT + 1756-M3 MEMORY EXPANSION

ALLEN BRADLEY 1756-L1M2 CONTROLLOGIX LOGIX5550 PROCESSOR, SER.A

ALLEN BRADLEY 1756-L61S GUARDLOGIX 5561S PROCESSOR SERIES:B, F/W REV 1.9

ALLEN BRADLEY 1756-L61S GUARDLOGIX 5561S PROCESSOR SERIES:B, F/W REV 1.9 -

ALLEN BRADLEY 1756-L62 CONTROL LOGIX 5562 PROCESSOR W/4 MBYTE MEMORY, SERIES B

ALLEN BRADLEY 1756-L64 CONTROLLOGIX LOGIX5564 PROCESSOR, SER.B

ALLEN BRADLEY 1756-L73S GUARDLOGIX 5573S PROCESSOR MODULE SERIES B

ALLEN BRADLEY 1756-LSP GUARDLOGIX 55LSP PROCESSOR SERIES:B, F/W REV 1.9

Allen Bradley 1756-M03SE

Allen Bradley 1756-M16SE ControlLogix 16-axis SERCOS servo module

ALLEN BRADLEY 1756-OB32 CONTROLLOGIX 10-31VDC OUTPUT MODULE, SER.A

ALLEN BRADLEY 1756-OF4 CONTROLLOGIX ANALOG OUTPUT MODULE, CURRENT/VOLTAGE, SER.A

ALLEN BRADLEY 1756-OF6CI CONTROLLOGIX ISOLATED ANALOG OUTPUT MODULE, SER.A

ALLEN BRADLEY 1756-OF8 CONTROLLOGIX ANALOG OUTPUT MODULE, CURRENT/VOLTAGE, SER.A

ALLEN BRADLEY 1756-OW16I CONTROLLOGIX ISOLATED RELAY OUTPUT MODULE, SER.A

ALLEN BRADLEY 1756-PA72 CONTROLLOGIX 85-265VAC POWER SUPPLY, SERIES C

ALLEN BRADLEY 1756-PA72/B

ALLEN BRADLEY 1756-PA72/C

ALLEN BRADLEY 1756-PA75 CONTROLLOGIX RACK MOUNT POWER SUPPLY SERIES B 85-265VAC

ALLEN BRADLEY 1756-PA75B

ALLEN BRADLEY 1756-PA75R CONTROL LOGIX REDUNDANT POWER SUPPLY, SERIES A

ALLEN BRADLEY 1756-PA75R CONTROLLOGIX 85-265 VAC REDUNDANT POWER SUPPLY,SERIES A

ALLEN BRADLEY 1756-PSCA2 CONTROL LOGIX REDUNDANT POWER SUPPLY CHASSIS ADAPTOR

ALLEN BRADLEY 1756-PSCA2 CONTROLLOGIX REDUNDANT POWER SUPPLY ADAPTOR MODUL,SER.A

ALLEN BRADLEY 1756-RM CONTROLLOGIX REDUNDANCY MODULE, SERIES B

ALLEN BRADLEY 1756-TBCH CONTROLLOGIX 36 PIN SCREW CAGE TERMINAL BLOCK, SER.A

ALLEN BRADLEY 1757-PLX52 PROCESSLOGIX CPU CONTROLLER MODULE, SERIES A

ALLEN BRADLEY 1757-SRC3 REDUNDANCY MODULE CABLE, 3M (9.84FT), SERIES A

ALLEN BRADLEY 1757-SRM PROCESSLOGIX CONTROLLOGIX SYSTEM REDUNDANCY MODULE,SER.B

Allen Bradley 1761-L32AWA

ALLEN BRADLEY 1761-NET-AIC ADVANCED INTERFACE CONVERTER, SERIES B

ALLEN BRADLEY 1761-NET-ENIW ETHERNET INTERFACE MODULE, SERIES D

ALLEN BRADLEY 1762-IQ32T MICROLOGIX DIGITAL INPUT MODULE, SERIES A

ALLEN BRADLEY 1766-L32BWA MICROLOGIX 1400 PROGRAMMABLE CONTROLLER SER.B REV.A

ALLEN BRADLEY 1769-IF8 COMPACT LOGIX 8-CH ANALOG VOLTAGE/CURRENT INPUT MODULE

ALLEN BRADLEY 1769-IQ32 COMPACT LOGIX 32-POINT 24V DC SINK/SOURCE INPUT MODULE

ALLEN BRADLEY 1769-L33ER

ALLEN BRADLEY 1769-OB32 COMPACT LOGIX 32-POINT 24V DC SOURCE OUTPUT MODULE SER:A

ALLEN BRADLEY 1769-PB2 COMPACT LOGIX POWER SUPPLY 24VDC INPUT,2A@5V DC OUTPUT

ALLEN BRADLEY 1771-IAN 85-138 VAC INPUT MODULE

ALLEN BRADLEY 1771-IND PLC-5 DIGITAL INPUT MODULE SERIES B

ALLEN BRADLEY 1771-KA

ALLEN BRADLEY 1771-OW16 PLC-5 OUTPUT MODULE SERIES B

ALLEN BRADLEY 1771-OWNA CONTACT OUTPUT MODULE

Allen Bradley 1771-P4

ALLEN BRADLEY 1771-SIM 8 POINT DISCRETE I/O SIMULATOR MODULE

Allen Bradley 1772-LE

ALLEN BRADLEY 1777-AL

ALLEN BRADLEY 1783-BMS10CGN STRATIX 5700 MANAGED ETHERNET SWITCH

ALLEN BRADLEY 1783-BMS20CGL STRATIX 5700 MANAGED ETHERNET SWITCH SERIES A

ALLEN BRADLEY 1783-US08T STRATIX 2000 UNMANAGED ETHERNET SWITCH SERIES:A

Allen Bradley 1784-CP10

ALLEN BRADLEY 1785-BCM PLC-5 BACKUP COMMUNICATION MODULE, SERIES C

Allen Bradley 1785-L20B