> Any thoughts would be appreciated. Can I (or do I wnat to) put a big 
> capacitor on the PLC supply. I don't have a O..scope, but do have a DMM 
> with RS-232, at it's slow (1 /sec.) rate nothing is showing up in the 
> PLC supply.
>
>   
perhaps its not so much a drop in the supply as a spike or surge thats
resetting it.
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