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。

iemens 18-483-905-508 Static Trip III it RMS-TSG-TZ

Fanuc A20B-1007-0140 Board A20B-1007-0140/03B

imation D918BU1 Circuit Board

Crouse  Hinds APM2 3/4" Pendant Mot Cover

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ABB 3HAC17342-1/01 Motor SGMAS-C2ARA-AB21 W/TS2620N871E172

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ico 308228 Encoder Interface Rev. 10

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Allen Bradley 1747-M13 EEPROM Module 1747M13 Ser.A

 Allen Bradley 1747-M13 EEPROM Module 1747M13 Ser.A

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Leeds And Northrup Company 4222-B Resistor 4222B

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Allen Bradley 1747-M13 EEPROM Module 1747M13 Ser.A Rev.A

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Parker 63CFMRCTUC46 Cylinder 63 CFMRCTUC 46.000 RC

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Rosemot 3144P-D1A1I5XA Temperature Transmitter 3144PD1A1I5XA

Endress  Hauser PMC45-RC15H6J1BF1 Pressure Transmitter PMC45RC15H6J1BF1

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