Sebastian,

Yes it is a gpio output to a relay which goes to another relay (ice cube),
which is the one that can be heard. A bit of a kludge, but it works. It is
set as an output in HAL and 99% of the time works properly. In every case I
am aware of, the problem only occurs when shutting down EMC and then
restarting EMC. As far as I know it never happens after a cold boot, and
only rarely when stopping and starting the EMC software.

Regards,
Eric


That dmesg looks perfectly normal.

When the computer powers on, the 5i20 I/O pins are all weakly pulled 
high.  When the hm2 driver & firmware loads, the state of the pins is 
determined by the firmware & config.  Pins configured as GPIOs default 
to inputs, which again are weakly pulled high.

On this machine, is the relay connected to an I/O pin configured as 
GPIO?  Is this I/O pin set to be an output in HAL (gpio.XXX.is_output = 1)?



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