On Tue, 25 Apr 2017, Marius Alksnys wrote:
Date: Tue, 25 Apr 2017 16:35:33 +0200
From: Marius Alksnys <mar...@robotise.lt>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Had to re-flash Mesa 7i77 twice
The firmware was the same, downloaded a month ago. The cable is provided
by Mesa, no damage observed.
Today is even "funnier": the machine started to drift away, like user
said, to go to completely different position than commanded in G-code.
This was observed at least four times. Two of them where going to the
material - operator noticed and hit the Emergency button.
I think it is drifting away with the latest analog command DACs received
and Enable signal state and all components: LinuxCNC, Mesa cards and
servo drives are happy with it, not stopping anything and not issuing an
error in a timely fashion.
The only way I can see this (drift) happening (assuming reasonable following
error settings) is encoder counting issues. If drift was the only issue I
would be tempted to enable encoder filtering(if not enabled) and perhaps lower
the encoder sampling rate.
But the drift in addition to the sserial+quadrature errors suggest a
systemic problem, perhaps 5V power to the 7I77 is marginal, or as I mentioned
before you have PC power/PCI issues (the list of sserial errors you got is not
really possible with just a link failure and I think reflects complete loss of
communication to the 5I25 card so the PCI reads are reading 0xFFFFFFFF and
therefore all possible hardware errors are reported)
You can see the videos and pictures by yourself. The user claims it is
the same G-code, almost the same time, no HW / SW changes, cables also
not touched. Maybe even without LinuxCNC restart:
https://www.youtube.com/playlist?list=PLMTctt_8ZIjX3eo2pw2IDmmH3Q34qZm83
The pictures of electric cabinet, cables, cards:
https://drive.google.com/drive/folders/0Bx5r7yxJ8GWDTVdvbnFxVFFyYmc?usp=sharing
04/24/2017 03:23 PM, Peter C. Wallace ra????:
On Mon, 24 Apr 2017, Marius Alksnys wrote:
Date: Mon, 24 Apr 2017 13:52:55 +0200
From: Marius Alksnys <mar...@robotise.lt>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: emc-users@lists.sourceforge.net
Subject: [Emc-users] Had to re-flash Mesa 7i77 twice
A month ago one machine with LinuxCNC and Mesa cards: one 5i25 and one 7i77
started bringing errors(1) each time program was started. Then I re-flashed
7i77 using ./update_7i77 script from mesanet page. It fixed the problem..
till today. Today I got similar errors(2). And again, reflashing 7i77 fixed
the problem.
If the error was not a complaint about the 7I77 firmware version being < 14,
reflashing the card would not help. I suspect that there is a signal
integrity issue perhaps in the 5I25 PCI/system connection, as that set of
errors looks like bad data at that interface.
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Peter Wallace
Mesa Electronics
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