Override Function; Relevant Variables/Fbs - Mitsubishi Electric MELSEC iQ-R Series User Manual

9.3

Override Function

• This function sets the factor for the target velocity and performs the control to change the velocity.
• This function sets the factor for the acceleration/deceleration and performs the control to change the acceleration/
deceleration. (The ratio to the acceleration/deceleration time cannot be set.)
• This function is invalid when using the control without the target velocity and the target acceleration. (Ex. Cam operation of
the positioning control)
• When the velocity and the acceleration/deceleration are changed by retrigger or continuous update, the override factor will
be added to changed velocity and the acceleration/deceleration.
• To change the override factor, there are a method of using the dedicated FB and a method of using control data.
Change method
Change using a dedicated FB
Change using control data
• The override factor can be set in the axis control data and the axes group control data respectively. Only the override factor
set in the axis control data is valid for single axis control, and only the override factor set in the axes group control data is
valid for axes group control
Targets to be changed and corresponding FBs, control data
Targets to be changed
Velocity Current value
Limit value
Limit value
*1 Axis parameters can be changed by MC_WriteParameter. However, it cannot be changed during control.
*2 The maximum value of the limit value cannot be changed.

Relevant variables/FBs

Variable/Structure name
AxisName.Cd.
AxesGroupName.Cd.
VelocityOverride
AccelerationOverride
AxisName.Md.
AxesGroupName.Md.
VelocityOverride
AccelerationOverride
The override factor can be changed by using MC_SetOverride and MC_GroupSetOverride.
Description
MC_SetOverride, MC_GroupSetOverride
AxisName.Cd.VelocityOverride, AxesGroupName.Cd.VelocityOverride, etc.
Corresponding FB
MC_MoveVelocity
MC_SetOverride
MC_GroupSetOverride
*1

*2
Maximum value of 
the limit value
Name
Velocity override factor
Acceleration override factor
Velocity override factor
Acceleration override factor
Corresponding control data
AxisName.Cd.VelocityOverride,
AxesGroupName.Cd.VelocityOverride
*1

*2

Details
Sets the velocity override factor.
Sets the acceleration override factor.
Sets the velocity override factor.
Sets the acceleration override factor.
9 RELEVANT FUNCTIONS TO VELOCITY
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9.3 Override Function
9