On Sun, 19 May 2019, Davide wrote:
Date: Sun, 19 May 2019 20:49:07 +0200
From: Davide <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: [email protected]
Subject: [Emc-users] Unusual help request.
The bob i'm using now is the keling c35, which gas buffered TTL outputs.
Maybe, since I need very High step rates (i need to reach almost max speed out
of these hybrid nema34-12NM steppers) i'm thinking about going with 7i92.
I've read the manual and there's not the possibility to set them for
differential output, am i right? In case i can build a simple rs422 bob.
Another possibility is 1X 7I96 which has 5X differential step/dir outputs
Yes, right now i have stretch with preempt-rt on, with lcnc 2.8. Peter, please
can you confirm 7i92 works OK with latest 2.8? And, just in case i'll feel more
confortable in using one 7i92 per winch and ethernet/optic fiber converters for
the long range, i know 4 of 7i92 are really oversized, but can you confirm they
can work together without slowing down everything?
This can work but depending on your host PC you might need to drop the servo
thread rate to 500 Hz or so, this has no effect on the maximum step rate,
just the number of velocity steps getting to full speed
I actually think it makes more sense to have one controller and wire the
step/dir signals the longest distance since they are the slowest, only a fwe
hundred KHz at most. This might change if you have distributed I/O (local limit
switches etc)
Thanks, Davide.
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Peter Wallace
Mesa Electronics
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