Mailbox Function - ABB FBIP-21 BACnet/IP User Manual

Mailbox function

The drive provides a Mailbox function to access parameters that have not been
pre-defined by the protocol. Using mailbox, any drive parameter can be identified and
read. Mailbox can also be used to adjust parameter settings by writing a value to any
parameter identified. The following table shows the mailbox objects.
Object ID Default ob-
ject name
AV25 Mbox-Param
AV26 Mbox-Data
To use the Mailbox function, write the parameter address to the Mbox-Param object
as a floating point value. The three lowest digits in the integer part are used for the
parameter index within the parameter group.
Example: For parameter 47.01, write the address as 47001.00 to the Mbox-Param
object. For parameter 47.999, write the address as 47999.00 to the Mbox-Param object.
Read or write the value to the Mbox-Data object as a floating point value. If the
parameter is a decimal type parameter, its value is shown as a decimal number. The
value of an integer type parameter is shown as an integer number.
Example: If parameter 47.01 has value 12.554 it is shown just as it is. If parameter 47.21
has value 125, it is shown just like that, without a decimal part.
Description
Parameter number to be used by mailbox function.
Set (W) or indicate (R) of the data value of mailbox function.
Communication protocol 49
Present
value access
type
W
W