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