The index number of the platform described by this object.
The high 16 bits represents the platform type as follows
1 Bay Controller
The low 16 bits represents the ID of the platform. For a server,
the ID is the server id.
For a module, the ID is slot number + (bay number - 1) * 40.
For a bay controller, the ID is slot number + (bay number - 1) * 2.