Thank you to all of you. your answers helped med a lot to debug the
problem which was ... a bad ribbon cable between the 7i43 and a screw
terminal board...yepp always something stupid. but I learned a lot on
the way.
So now I need to play with scaling and PID tuning..
Hi all,
I just got a message from a guy in Germany who is looking at EMC for a
retrofit on a CNC rolling machine.
It can be used to roll tubes or cones, and has 6 adjustable axes, with
linear scales and hydraulic motors.
He has the analog servo drives for the proportional hydraulic valves. I
? An open collector output is just that, open collector. You need to
terminate it at the lead end with resistor according to the voltage you're
using, to the positive rail. Terminating with a 100R to ground is simply a
poor configuration.
Regards
Roland
2009/7/17 Jon Elson
Hi Peter,
One difference is that the TTL inputs have an RC filter, the differential
inputs have none.
Hmm, that could still point towards a noise issue then.
I wonder if your index outputs can drive the termination resistor. Have you
measured you index and /index outputs for reasonable
On Fri, 17 Jul 2009, Leslie Newell wrote:
Date: Fri, 17 Jul 2009 20:48:16 +0100
From: Leslie Newell les.new...@fastmail.co.uk
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: Re:
Hi Peter,
Each output swings from 0.48V to 4.1V. When IDX is high, /IDX is low.
Therefore the voltage between them is about 3.6V.
Les
What I was asking about (maybe not very well) is differential drive: in other
words measured between IDX and /IDX. This should be positive in one index
Did you measure that while it was connected to the receiver? If the
terminator is 100 ohms and the pull up is 1K ohms, the voltage under
load would only be around 400 mv. That should be fine, I think.
If the pull up is 10K, then you would have around 40 mv. I don't think
that would work too
On Fri, 17 Jul 2009, Leslie Newell wrote:
Date: Fri, 17 Jul 2009 22:13:46 +0100
From: Leslie Newell les.new...@fastmail.co.uk
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: Re:
Hi Ken,
Yes, this was under load.
Les
Kenneth Lerman wrote:
Did you measure that while it was connected to the receiver? If the
terminator is 100 ohms and the pull up is 1K ohms, the voltage under
load would only be around 400 mv. That should be fine, I think.
If the pull up is 10K,
