110
Rockwell Automation Publication 2080-UM002L-EN-E - November 2021
Chapter 7 Motion Control
PTO Pulse Accuracy
Micro800 motion feature is pulse-based and the value of distance and velocity
are designed in such a way that all PTO-related values are integers at the
hardware level, when converting to PTO pulse.
For example, if the user configures Motor Pulses per Revolution as 1,000 and
Travel per Revolution as 10 cm and the user wants to drive velocity at 4.504 cm/
sec. The target velocity is 4.504 cm/sec (that is, 450.4 pulse/sec). In this case, the
actual commanded velocity will be 4.5 cm/sec (that is, 450 pulse/sec), and the
0.4 pulse/sec is rounded off.
This rounding scheme also applies to other input parameters such as Position,
Distance, Acceleration, Deceleration, and Jerk. For instance, with above motor
revolution configuration, setting Jerk as 4.504 cm/sec
3
is the same as setting
Jerk as 4.501 cm/sec
3
, as both are rounded off to 4.5 cm/sec
3
. This rounding
applies to both axis configuration input in the Connected Components
Workbench software and function block input.
Motion Axis Parameter Validation
Besides falling within the predetermined absolute range, motion axis
parameters are validated based on relationships with other parameters. These
relationships or rules are listed below. Error is flagged whenever there is
violation to these relationships.
•
Lower Soft Limit should be less than the Upper Soft Limit.
•
Start/Stop velocity should not be greater than the maximum velocity.
•
Emergency Stop velocity should not be greater than the maximum
velocity.
•
Homing velocity should not be greater than the maximum velocity.
•
Homing acceleration should not be greater than maximum acceleration.
•
Homing deceleration should not be greater than maximum deceleration.
•
Homing jerk should not be greater than maximum jerk.
•
Homing creep velocity should not be greater than maximum velocity.
Delete an Axis
1. On the device configuration tree, and under Motion, right-click the axis
name and select Delete.