126 Rockwell Automation Publication 750-UM006C-EN-P - March 2022
Chapter 4 Configure and Start Up the Drive
There are two alternate update periods that you can configure when using Axis
Scheduling.
The Base Update Period determines how often the motion planner runs.
When the motion planner runs, it interrupts most other tasks regardless of
their priority. The motion planner is the part of the controller that takes care of
position and velocity information for the axes.
Follow these steps to set the Base Update Period
1. In the Motion Group Properties dialog box, choose the Attribute tab.
2. Set the Base Update period to an interval between 4.0…32.0 ms.
For the PowerFlex 755 drive, the minimum Base Update Rate is 4.0 ms.
3. Click on Axis Schedule to open the scheduler.
For detailed information on the Axis Scheduling function, refer to Integrated
Motion on the EtherNet/IP Network: Configuration and Startup, publication
MOTION-UM003
.
Logix allows the axis to use one of three course update rates. The Base Update
period for Alternate 1 and 2 must be a multiple of the Base Update period. We
recommend that the drive be set to a Base Update Period of 4 ms when the
drive is used for Positioning. (Minimum allowed is 3 ms). For all other modes
of control (speed, torque, Volts/Hertz, and so on) we recommend an Update
Period of 20 ms.
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