3HAC029818-001/10 DSQC663 ABB

描述

为了系统配置方便，有的主箱体还可增加内插选件，如通讯接口选件、内存选件、模拟量输入选件等，为要增强主箱体功能的用户提供方便。

此外，还有扩展箱体。扩展箱体外观与主箱体类似，但一般只有I/O系统及电源（有的没有，其电源可由主箱体提供）。有的另有其它功能。

如主箱体控制点数不符需要或功能不足，可再接扩展箱体。如接一个扩展箱体后，点数还不够，还可再接若干个扩展箱体。

模块式的PLC：它由具有不同功能的模块组成。其主要模块有，模块、输入模块、输出模块、电源模块、通讯模块、机架…等等。大、中型机都是模块式的。

在结构上讲，由模块组合成系统有三种方法：

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