PDO代表的物理设备对象。

PDO stands for physical device object.

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PDO代表的物理设备对象。总线驱动使用这个对象来描绘介于设备和总线之间的连结。

PDO stands for physical device object. The bus driver USES this object to represent the connection between the device and the bus.

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第一级包括性能对象，它是可以为物理设备建模，或者抽象系统中组件的单元。

The first level consists of the performance object, which is a unit that can model a physical device or abstract component in a system.

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