5P81 B&R
二、I/O模块:
PLC的对外功能,主要是通过各种I/O接口模块与外界联系的,按I/O点数确定模块规格及数量,I/O模块可多可少,但其大数受所能管理的基本配置的能力,即受大的底板或机架槽数限制。I/O模块集成了PLC的I/O电路,其输入暂存器反映输入信号状态,输出点反映输出锁存器状态。
三、电源模块:
有些PLC中的电源,是与模块合二为一的,有些是分开的,其主要用途是为PLC各模块的集成电路提供工作电源。同时,有的还为输入电路提供24V的工作电源。电源以其输入类型有:交流电源,加的为交流220VAC或110VAC,直流电源,加的为直流电压,常用的为24V。
四、底板或机架:
大多数模块式PLC使用底板或机架,其作用是:电气上,实现各模块间的联系,使能访问底板上的所有模块,机械上,实现各模块间的连接,使各模块构成一个整体。
五、PLC的外部设备
外部设备是PLC系统不可分割的一部分,它有四大类
1.编程设备:有简易编程器和智能图形编程器,用于编程、对系统作一些设定、PLC及PLC所控制的系统的工作状况。编程器是PLC开发应用、监测运行、检查维护不可缺少的器件,但它不直接参与现场控制运行。
2.设备:有数据和图形。直接监视数据或通过画面监视数据。
3.存储设备:有存储卡、存储磁带、软磁盘或只读存储器,用于地存储用户数据,使用户程序不丢失,如EPROM、EEPROM写入器等。
4.输入输出设备:用于接收信号或输出信号,一般有条码读人器,输入模拟量的电位器,打印机等。
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