Parker Hannifin
Immediate Mode
While a program is running, the master velocity can be changed for
a master (and all axes attached to it). The change is instantaneous,
and takes effect even if the axis or axes are moving.
Use the FOV (Set Feedrate Override) command to set a floating-
point scaling factor to adjust the master velocity. If a move is in
progress, the master uses the established acceleration or
deceleration ramp to adjust to the new velocity.
NOTE: The FOV command does not change the master velocity
permanently and the change is not saved. To make a
permanent change, adjust the master velocity in the
program code either manually or through the Configuration
Wizard.
For more information about feedrate override, see the FOV
command in the ACR Command Language Reference.
Example
The following is typed in at the prompt by the user. It reduces the
master velocity for all attached axes to 75%, then 50%, and then
returns the velocity to 100%.
FOV 0.75
FOV 0.50
FOV 1.00
Differences Between FOV and VEL
While a program is running, both the FOV and VEL (Set Target
Velocity for a Move) commands can be set, but each affects
motion differently:
• FOV immediately affects all axes attached to the master.
• VEL is buffered in memory. The newly commanded velocity
does not take effect until current motion is completed.
52 Programmer’s Guide
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