The PTOHome and PTOEnhancedHome function blocks are used to set the axis to a reference position.
The Long Cam Positive homing method only uses the Origin input (Cam).
The following diagram illustrates the Long Cam Positive homing method:
The reference point is preset at the negative side of the Cam, when coming in negative direction (from the Cam) at low velocity.
NOTE: If the function is initiated when the Origin = 0 and direction is backward, an error is detected and the command is aborted.
The following errors can be detected:
oWhen the PROX input is enabled, an error is reported in the LIMIT_FLT status object when the limit is crossed.
oWhen the axis is off the Cam and the direction is set backward (negative velocity), the homing function will not be executed and an error will be reported in the HOMING_FLT status object.
