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" <[email protected]>
Sent: Monday, March 22, 2010 12:41 PM
To: "Enhanced Machine Controller (EMC)" <[email protected]>
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 Β128ia. 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 Βis 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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