Rockwell Automation 1788-CN2FF ControlNet-to-FOUNDATION Fieldbus H1 Linking Device User Manual - Manual (Page 43)

1788-6.5.1 - January 1999
Using the ControlNet-to-FOUNDATION Fieldbus H1 Linking Device 4-17
Figure 4.11 Sample NI-FBUS Configurator View of ControlNet Object Information
Changing the Linking Device Configuration
Once a configuration is created in the linking device and a PLC processor or
PC is using the offsets previously defined, an addition to the configuration
should not require you to change functioning code in your application. For
this reason, once a configuration has been stored into the linking device, if
the user wires more Fieldbus devices with NI-FBUS, additional object
instances are created and additional offsets are
appended to the assembly
objects; the existing instances of ControlNet objects and assembly offsets
are unchanged. The individual instances increment from the last one used in
the category. The offsets within the assembly objects are assigned in the
same order as described previously, but are placed after existing offsets. For
example, assume you have two MAI channels and one MDO channel with
cascade initialization. The instances and offsets are created. Sometime later,
you need to add an additional MAI channel and two MAO channels to your
configuration. These additions are placed
after the final MDO from the
previous configuration.