# Look ahead speed limit (speed_limit_look_ahead.*)

Depending on the machining technology used, it may be necessary for the controller to inform the PLC about changes in velocity profile. In this case, if velocity falls below the speed limit, the CNC generates a signal 'speed limit detected' (SLD).

Timing example of speed limit look ahead

speed_limit_look_ahead.enable 1 0: inactive, 1: active

speed_limit_look_ahead.v_limit 750 [0.1%] of programmed speed

speed_limit_look_ahead.time 1 unit of time or distance

speed_limit_look_ahead.dist_to_corner 5000 [0.1 µm or µs]

speed_limit_look_ahead.dist_from_corner 6000 [0.1 µm or µs]

speed_limit_look_ahead.override_weight_v_limit 0 0: inactive, 1: active

## Additional information

- Enable / disable (P-CHAN-00017)
- Weighting of speed limit (P-CHAN-00089)
- Unit (P-CHAN-00018)
- Distance to corner (P-CHAN-00013)
- Distance from corner (P-CHAN-00012)
- Weighting the speed limit via override (P-CHAN-00155)