Hi,
to start with put local inst = mc.mcGetInstance() inside the function otherwise 'inst' is out of scope.

Craig

thanks for the basics tip!

If you look at the Axis Mapping in the Mach4 control config you can get an idea of what child ID could be. I'm thinking it could be the position of master/slave boxes for each motor. So X axis master you would use 0 for the axis and 0 for child ID. To get the slave 1 motor id for the X axis you would use 0 for the axis and 1 for the child ID.

Are you trying to get the axis ID or the motor ID?

There is also this function from the API:

Code: [Select]

axisId, rc = mc.mcMotorGetAxis(number mInst, number motorId)

Searched inside the ini file and foud the following info:

Axis 3 = Child ID0 = Motor 4, Child ID1 = No motor found.  So your info seems correct. If i want the value of the motor in need 0 in the child ID.

still don't get the function working tho...
do i need to do something special for the number to return?