Hi Justin,
I can't answer your question--I would like to know how to do it as well--but I would double check your idea of the 'soft' EStop against your country's and industry's safety standards.
It's my experience that most customers require EStop circuitry to be specifically hard-wired. There are entire catalogs of this type of safety equipment: monitored safety relays, guard PLCs, etc. Most customers that accept 'soft' EStops require safety-rated certifications of the software logic, which I seriously doubt CVI can meet the requirements. Also, I have never heard of a safety-rated installation of WIndows, assuming that is your deployment target. That said, some groups recognize a category of stop button that can be done in software, typically called 'controlled' stop buttons, which could drop power to your mains or signal a rapid stop or EStop, but you normally don't advertise them as part of the safety circuitry.
Orlan
