On Sat, 6 Dec 2014, David Armstrong wrote:
> Date: Sat, 6 Dec 2014 17:57:21 +0000
> From: David Armstrong <[email protected]>
> Reply-To: EMC developers <[email protected]>
> To: EMC developers <[email protected]>
> Subject: [Emc-developers] 7i77 and stepper output
>
> more for PCW i'd expect :
>
> is it possible to get a stepgen output from a 5i25/7i77 card
> either from one of the servo outputs or from 2 gpio pins ? , ( needed for a
> toolchanger )
> either TB5;DRV3 or any gpio on TB7
>
> (in this particular case i dont have the option of using use directly from
> the 5i25 )
>
> I presume a flash update will be required too of course
>
>
> Dave
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Not really possible to do high performance stepgens
from the 7I77, though you could use the field I/O for low step rate
motion (using a software stepgen at the servo thread rate) a decent MB will
allow a 4 KHz servo thread so that gets you to a 2 KHz step rate, not grets
but maybe useable
Theres really only one high speed output on the 7I77 card and thats
the expansion RS-422 TX pin. so I guess something could be rigged up to use
a field I/O for direction and the RS-422 pin for stepgen but its pretty M^2
Better choice is probably to use the other 5I25 connector
Peter Wallace
Mesa Electronics
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