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<== Date ==> <== Thread ==>

Subject: Re: Motion control failure at APS
From: "Ronald L. Sluiter" <[email protected]>
To: EPICS <[email protected]>
Date: Thu, 16 Nov 2006 10:11:49 -0600
Based on reports sent to me by Martin Heiniger (PSI), I have to
amend my original message regarding the uniqueness of the
VME58 board failure that occurred here at the APS in July.

Martin has had two or three VME58 boards fail in exactly the
same manner in the past few months.

Martin adds two important data points; first, the number of
boards that are known to have failed in this "slow run away"
manner increases from one, to three or four.  Second, unlike
the board here at the APS, Martin's boards were not in a
radiation environment.

Martin's response to my inquiries follows.

Thanks Martin,
Ron

Martin Heiniger wrote:

Dear Ron

Ronald L. Sluiter wrote:

Were the boards that failed in a radiated environment?

no, they were installed in crates in the technical gallery, far away from the tunnel. The technical gallery is not radiation area, everybody can go there, even eat and drink.


When we experienced this VME58 board failure the VME58 board
was in a VME crate without VMEbus "system" indicator lights; e.g.
SYSRESET, SYSFAIL. It was only later, when we put the failed
VME58 board in a VME crate with indicator lights that we realized
that the VME58 was asserting and deserting SYSFAIL 4 times
a second.

The same with us, our crates don't have these indicators too. But because I am still waiting for an RMA of our local distributor, I have defective 1 OMS VME58 here. So I plugged this card into a crate with no other cards (not even a CPU). All axis began to move! The following oscillogramm shows channel 1 connected to the "clock" (step) signal of axis 1:




The period of the "clock" (step) signal of motor axis 1 is 243.088 ms (measured on the motor amplifier clock LED).


Then I measured the /SYSFAIL signal on the bus:




The period is 243.085 ms and is quite equal to the clock (step) pulses measured before.

As far as I can see, the SYSRESET is not active (no system reset).

Were your failed boards toggling SYSFAIL?

So yes, the board is toggling SYSFAIL too with about 4 times per second, as you wrote.



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