# Block ahead limiting via number of blocks (P-CHAN-00216)

P-CHAN-00216 | Select decoder block ahead limiting via number of blocks
Description | Parameter for activating and configuring the decoder block ahead limiting function based on NC blocks by setting a value unequal to zero. This value defines the maximum number of (relevant) NC blocks (rows) by which the decoder block ahead function may be ahead of the interpolator.
Parameter | max_nc_blocks_ahead
Data type | UNS32
Data range | 0: No decoder block ahead limiting (default). >0: After program start, decoder block ahead limiting function is immediately active with the number of NC blocks and this function remains selected until main program end M02/M30.
Dimension | ----
Default value | 0
Remarks | Only one type of decoder block ahead limiting function may be active. This is active immediately after program start and it remains selected until main program end M02/M30.