ABB ACH550-UH User Manual page 444

2-98
Mailbox read/write
The ACH550 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 describes the use of this function.
Name
Mailbox
Parameter
Mailbox
Data
Mailbox
Read
Mailbox
Write
1. As noted above, Modbus provides direct access to all parameters using the format: 4 followed by
the parameter number.
Embedded fieldbus
Description
Enter the number of the drive parameter
to access.
Contains the parameter value after a
read, or enter the desired parameter
value for a write.
A binary value triggers a read – the value
of the "Mailbox Parameter" appears in
"Mailbox data".
A binary value triggers a write – the drive
value for the "Mailbox Parameter"
changes to the value in "Mailbox data".
ACH550 E-Clipse Bypass User's Manual
Protocol Reference
1
Modbus N2
Does not AO19 95
apply.
AO20 96
BO19 97
BO20 98
FLN BACnet
AV25
AV26
BV15
BV16