On Fri, 17 May 2013, Sebastian Kuzminsky wrote:
> Date: Fri, 17 May 2013 15:33:05 -0400
> From: Sebastian Kuzminsky <[email protected]>
> To: "Enhanced Machine Controller (EMC)" <[email protected]>
> Subject: Re: [Emc-users] 7i43 watchdog has bitten, looking for the cause ?
>
> On 05/17/2013 03:27 PM, Andrew wrote:
>> 2013/5/17 Maximilian H <[email protected]>
>>
>>> I use a
>>> servo loop of one millisecond.
>>>
>>
>> I'd say 1ms is too short for 7i43, at least it never worked for me. Try
>> increasing it to 4ms to eliminate the possible cause.
>
> I've run a 7i43 at 1 kHz, "it worked fine for me". I guess it would
> depend on the user's hardware how well it works.
>
> Maximilian reported that after a watchdog bit, the max time taken by the
> servo thread was 765 us:
>
>> Realtime Threads:
>> Period FP Name ( Time, Max-Time )
>> 498550 YES servo-thread ( 6060, 764883 )
>
> ... so a 1 ms servo period doesn't seem to be the problem here.
>
>
> --
> Sebastian Kuzminsky
Another possibility that Sebastian hinted at is that there's an electrical
noise problem. This could cause a false reading that indicates a watchdog
timeout even though one has not happened (though you would expect many
readings to be corrupted in this case not just watchdog state)
Peter Wallace
Mesa Electronics
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