# Lifting an axis with time-based calculation (P-CHAN-00345)

P-CHAN-00345 | Switch-over to time-based calculation when an axis is lifted
Description | When an axis is lifted (see [FCT-A11]), it can be lifted or lowered automatically independent of the path motion. The CNC limits the maximum lift height so that the axis can reach the target point of the lowering movement and not influence the path motion. Normally this takes place during path preparation with a path-based coupling of the axis to the main motion path. Instead the 'enable_time_base_lift' parameter can enable a time-based consideration in the real-time GEO task of the controller. As a result, greater lifting height can be reached afterwards. However, time-based coupling requires considerably more computing power in the real-time task of the controller. The HSC slope profile and the time-based approach cannot be used at the same time.
Parameter | enable_time_based_lift
Data type | BOOLEAN
Data range | 0: Path-based approach (default). 1: Time-based approach.
Dimension | ----
Default value | 0
Remarks | The time-based approach must also be included in the configuration data of the path preparation and interpolation function in the controller. Here, set the key word FCT_LIFT_UP_TIME in the parameters P-CHAN-00600 and P-CHAN-00650 (alternatively: P-STUP-00060 and P-STUP-00070).

Parameterisation example with P-CHAN-00600 / P-CHAN-00650

configuration.path_preparation.function FCT_DEFAULT | FCT_LIFT_UP_TIME

.interpolator.function
FCT_DEFAULT | FCT_LIFT_UP_TIME

Alternatively, the function can be parameterised in the start-up list (P-STUP-00060 / P-STUP-00070).
Example of the 1st CNC channel:

configuration.channel[0].path_preparation.function.
FCT_DEFAULT | FCT_LIFT_UP_TIME

configuration.channel[0].interpolator.function.
FCT_DEFAULT | FCT_LIFT_UP_TIME