7i96 configuration for servo motor use case

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21 Sep 2022 13:28 #252505 by millathe
Hi all,

I want to configure my 7i96 mesa card to control 3 DC-Servomotors ( I also intend to use 7i33TA daughter board)
But pncconf does not allow me to choose any pwm generators. I'm only able to choose 5 step generators.
As far as I read 7i96 should generate a PWM + direction signal and the 7i33 board converts it into an analog voltage of +/-10V.

How do I have to proceed?
Thanks and best Regards
Gerhard

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21 Sep 2022 13:56 #252508 by PCW
How had you intended to connect the 7I33 to the 7I96?

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21 Sep 2022 14:06 #252510 by millathe
Via P1 expansion connector of 7i96

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21 Sep 2022 14:34 #252512 by PCW
It should be possible but requires a special cable and there are not
enough pins for 3 full axis unless some PWM enables are combined
or encoder index pins are not used.

There wont be any pncconf support for this but you could copy/paste
that relevant servo hal code from a 7I33 example configuration

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21 Sep 2022 15:28 #252516 by millathe
Thanks for your support.
so what would be the best approach since pncconfig generates error messages "you forgot to define a stepper or pwm-signal for x/y/z axis" and does me not allow to proceed. Just configuring 3 random step generators and later on deleting them in the hal?
I know that a special assembled ribbon cable connection is necessary since one connector has 50 pins while the other one only has 26 pins.
So in principle 6 signals are needed for controlling the 3 axes and 9 signals for the three DRO encoders --> 15 signals in total
>> copy/paste that relevant servo hal code from a 7I33 example configuration
could not find anything in the web, can you please provide a link?
-thanks-

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21 Sep 2022 15:37 #252518 by PCW
If you use the pnconf 7I80HD --> SV12 selection as a starting point, that should be close

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