Rockwell Automation 5730 DriveLogix5730 Controller for PowerFlex 700S Drives with Phase II Control - Manual (Page 50)

2-26 Placing and Configuring the Drive
Use Aliasing for all Communication Format Connections Between
DriveLogix and the PowerFlex 700S
Using aliases for the tags in the Communication Format (i.e. Speed Control,
Motion Control, Position Control, User-Defined 1 and User-Defined 2) has
the following benefits:
• Improves program portability over processors and through upgrades to
DriveLogix, PowerFlex 700S, and RSLogix 5000 firmware.
• Allows real names to be applied to the User Defined tags of the static
assembly.
• Allows new functions of DriveLogix and the PowerFlex 700S to be
clearly named in the program even if RSLogix 5000 has not been
updated.
• Allows long tag names in RSLogix 5000 to be shortened for easier
program viewing.
• Allows tags to be named using the above naming convention to identify
machine section association.
Apply aliases to all external connections including the PowerFlex 700S
Communication Format and I/O. All defined bits should be included.
Use "Periodic Tasks" to optimize processor utilization.
Name periodic tasks to identify the update time
(e.g. Periodic_020ms_P9 = 20ms task with priority 9).
Set the periodic task time appropriate programming requirements.
Important: Remember that tasks with faster the task times consume more
processor bandwidth than those with slower task times.
Set the priority of each task to coincide with the task speed. Set faster tasks
to higher priority.
Important: Remember lower priority numbers define higher priorities (e.g.
a task with a priority number of 9 has a higher priority than one
with a priority of 10).
Important: Do not set the priority number lower than 8 (the recommended
priority range is 8-15). This will provide I/O scanning with
optimal updating. Flex I/O and Compact I/O are coded as
priority 7 for DriveLogix.