Rockwell Automation 1788-CN2FF ControlNet to Foundation Fieldbus H1 Linking Device Installation Instructions - Manual (Page 20)

20 ControlNet-to-Foundation Fieldbus H1 Linking Device
Publication 1788-IN051D-EN-P - February 2004
To locate the Device Info, expand the CN2FF tree and double-click on Device Info.
Each tag in the FieldbusTag column counts as a fieldbus connection. There can be duplicate
Instance numbers for different types of modules (e.g. DI vs. AI).
On any one port you can have up to a maximum of 18 connections. If you are using 18
connections on one port, the second port would only be allowed 12 connections for a total of
30 per CN2FF.
When
accounting
for the
number of
connections,
you need to
count the
number of
Tags in the
FieldbusTag
column and
not the
number
identifying
the
Instances.
Even though
there is a
duplicate
Instance of 1, it
is still counted as
a separate
FieldbusTag that
counts against
the total 30
connections. This
example has 12
connections.