I hesitate to post this, but this is what I do for my enable on power up of my axis (which are actually ac induction motors controlled by VFD). I do have an estop but it is already wired to the VFD's directly, as I get things sorted out I'll look into Al_the_Man's Shunt Regulators. Anyway using a couple of opto couplers with the SWE signal it's easy to have control over the KAnalog output's during boot. The model of opto coupler was chosen because I could find them on ebay with din rail mounting for cheap...

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