ADLINK PCI-8154 - Manual (Page 58)

48 Operation Theory
4.2.5 Velocity mode
Veloctiy mode means the pulse command is continuously output-
ing until a stop command is issued. The motor will run without a
target position or desired distance unless it is stopped by other
reasons. The output pulse accelerates from a starting velocity to a
specified maximum velocity. It can be follow a linear or S-curve
acceleration shape. The pulse output rate is kept at maximum
velocity until another velocity command is set or a stop command
is issued. The velocity could be overrided by a new speed setting.
Notice that the new speed could not be a reversed speed of origi-
nal running speed. The speed profile of this kind of motion is
shown as below: