Re: [Emc-users] Fanuc Serial encoders

[Dave K. <pke...@wo...>]

Jon,
         These encoders are made to have a battery backup attached to them 
so they can retain position when shut off for long periods of time. When the 
machine is powered up it sends a request on one of the lines for the encoder 
to send it's position info back to the control so it can start updating 
position. It works a lot like the Heidenhan Serial scales.

Dave Keeton



--------------------------------------------------
From: "Jon Elson" <el...@pi...>
Sent: Monday, March 22, 2010 12:41 PM
To: "Enhanced Machine Controller (EMC)" <emc...@li...>
Subject: [Emc-users] Fanuc Serial encoders

> With all this talk about serial encoders, does anyone know anything
> about Fanuc serial encoders?  I've been looking for the protocol specs
> all weekend with no luck.  It seems they have  a VERY large number of
> motors out there in the later "red cap" series, the encoder is called
> the &Beta;128ia.  It has 128K counts/rev (131072).  There is also a 64K
> count version.  It is an absolute encoder, and retains index alignment
> for 10 minutes when unpowered.  The closest thing I found was a patent
> document, but it was not specific enough about the format.
>
> Anyway, motors from the &Beta;is series use this encoder.  Some typical
> motors are the A06B-0078-B003, which has encoder model A860-2020-T301.
>
> Thanks in advance for any help anyone can offer.
>
> (If anyone wonders what this (ampersand) Beta ; stuff is, the browser is
> supposed to translate that to a Greek capital Beta character.)
>
> Jon
>
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