Rockwell Automation 8520-9API 9/Series OCI API Developer's Guide - Manual (Page 62)

4–14 OCI Data Server Data Items
Publication 8520-6.6 - August 1999
The 9/Series provides a dual process option which allows the use of
the 9/Series to control multiple processes. Many API data items and
commands present different data based on the process you are
looking at. Refer to appendix A and B to identify if your API data
item or command is available in two different process.
Important: Dual process options are not available for Release 1 of
the 9/PC CNC.
To specify which process your API data request or command is
targeting you can append the process number to the data item or
command following a period. For example:
NUM_AXES.1
NUM_AXES.2
would request the number of axes in process 1 and process two
respectively.
The default for all per process commands and API items is always
process 1 so the API item:
NUM_AXES
on a dual process system returns only process 1 data.
If an item or command has an argument, follow the process number
with the argument. For example:
AXIS_NAME.2,2–3
would return the second and third axis names in process 2.
Selecting the Process for
Dual Process Controls