罗克韦尔1746-BLM

罗克韦尔1746-BLM

1、从PLC的组成来看，除CPU，存储器及通信接口外,与工业现场直接有关的还有哪些接口?并说明其主要功能。

1）输入接口:接受被控设备的信号,并通过光电耦合器件和输入电路驱动内部电路接通或断开。

2）输出接口:程序的执行结果通过输出接口的光电耦合器件和输出组件(继电器、 晶闸管、晶体管)输出,控制外部负载的接通或断开。

2、PLC的基本单元由哪几个部分组成?各起什么作用?

1）CPU：PLC的核心部件,指挥PLC进行各种工作。如接受用户程序和数据、诊断、执行执行程序等;

2）存储器:存储系统和用户的程序和数据;

3）I/O接口:PLC与工业生产现场被控对象之间的连接部件,用来接受被控设备的信号和输出程序的执行结果;

4）通信接口:通过通信接口与监视器、打印机等其他设备进行信息交换;

1746-BLM 

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1746-BLM