flexmotion6C pulse output

[garygoh]

I am trying to get variable length digital pulses out
of the flexmotion6 board using the UMI-Flex6 terminal
block. Yusuf C, suggested I configure the axis to run on open loop stepper mode and tap the Step(CW) and Dir(CCW) lines during a simple move. This should
give a pulse train. And I can change the frequency by changing the velocity of the move.

When trying to configure axis 5 as a stepper
and running the 1-D interactive program under the
MAX program to test the axis, I get the error message "Error 70017
NIMC_StepperOnlyError Occurred in set stepper loop
mode (flex_set_stepper_loop_mode) on Axis 05
This command is valid only on a stepper axis"

I have also considered using the flex_load_DAC
command to load a value into the DA
C directly.
Is it possible to use this cammand with DAC 1
through 6, provided they are not associated with
an axis (ie. the axis is disabled or the DAC channel is
not selected for a particular axis.

Thanks for your help

[Amaury]

Ysusf's suggestion should work for you. The error which you are getting indicates that you are trying to change the stepper loop mode on an axis which is set up as a servo. To fix this change the axis configuration to stepper and then hit apply and initialize board.

In order to use the DAC on a channel it must also be configured as a stepper. And then you can do the load DAC. I'm not sure how this is to be a substitute for outputing a pulse train but if does the trick then great!

Regards,
Amaury Rolin
NI Applications Engineer