ADLINK PCI-8154 - Manual (Page 64)

54 Operation Theory
If the 2nd command’s speed value is lower than the others, the
settings would be like as following diagram:
For 4-axis continuous arc interpolation is the same concept. You
can set the speed matched between two command speed set-
tings.
If the INP checking is enabled, the motion will have some delayed
between each command in buffers. INP check enabled make the
desired point be reached but reduce the smoothing between each
command. If users don’t need this delay and need the smoothing,
please turn INP checking off.