Output O1 is normally used as information about the situation of the
motor position or velocity except for Rx modules, where it can be
selected as "User defined".
In the different position modes, this output is activated if the motor
is within the "In Position Window" for the number of samples indicated
by "In Position Count".
In the different Velocity modes this output indicates that the motor is
with the "At Velocity Window" also defined by the same 2 registers
See more about register 33 and 34 in the Technical Manual.
The modules MAC00-Bx, Rx, FCx, FDx, FPx and FSx all support this
functionality.
This output needs a voltage supply if a module is used, because it's
isolated from the motor.