# Maximum permissible axis velocity in security zone 2 (P-AXIS-00503)

P-AXIS-00503 | Maximum permissible axis velocity in security zone 2
Description | The parameter defines the maximum permissible axis velocity inside the security zones 1 and 2 if the control signal is active. Activation for security zone 2 is executed by the “Reduced velocity in zone 2“ control unit. This security zone is limited by the position limits given by P-AXIS-00105 and P-AXIS-00097.
Parameter | getriebe[i].vb_max_red_zone_2
Data type | UNS32
Data range | 0 ≤ P-AXIS-00503 ≤ P-AXIS-00212
Axis types | T, R
Dimension | T: µm/s | R: 0.001°/s
Default value | 0
Drive types | ----
Remarks | This parameter is available as of CNC Build V3.1.3052.05 or higher. When the parameter value is not set or has the value 0, vb_max_red_zone_2 is not active, i.e. the identical value of P-AXIS-00030.

Parameters of permissible axis velocities inside the second security zone

Remark on active acceleration during the deceleration phase:

The effective acceleration during deceleration depends on the following factors:

- the channel parameter P-CHAN-00097
- the time of activation of the signal for the “Reduced velocity in zone 2“ in the PLC
- the current axis position at this time in relation to the zone.

If the axis is outside the zone at the time of signal activation, the axis decelerates at the acceleration value of P-AXIS-00004 . If the axis is inside the zone, the axis decelerates at the acceleration value of P-AXIS-00024 .