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Re: Hard wiring?
I suspect it comes from #2 eric. The field software makes us safe by killing all the outputs on the robot. If it were not able to do that, the compressor could choose to fill at any time it likes, with unexpected results.
For instance, say you have a pneumatic firing mechanism, and a spike shorts or malfunctions so that robot keeps shooting. Without being able to kill the compressor with the E-stop, the firing mechanism will just keep firing while the compressor works happily to refill it.
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