TTL signals from motor outputs

[jabraxas]

I'm currently using a stepper motor with a MID-7604 drive and a PCI-7344 controller. I would like to output TTL signals from the drive at certain motor positions, but do not have an encoder (which is required for breakpoint signals). Is it possible to `construct' a TTL type signal using the low-level motion functions in LabView, and then output them through a motor axis that is not currently being used?

[Scott_R]

Hello,

Depending on the type of output that you want to generate (single pulse or pulse train) you could use the Digital IO port of the motion controller with the Set IO Port MOMO.flx function to toggle DIO lines or you could use the Configure PWM Output.flx function to generate a pulse train.  The downside is that this will be software timed based on the current position as determined by the controller.

There is not any way to manually modify the motion control signals that are generated by the controller.  That is all handled by the FPGA of the controller.

Regards,

Scott R.

Applications Engineer

National Instruments

[jabraxas]

Thanks Scott. Timing might be an issue for us, but this is worth considering.