PeterW
Member
should it not be if either hand switch is depressed then the other must be depressed within a very short (extremely short) time.
Same for footswitches.
Any hand or foot release should imediately stop the machine.
But hey, as already said, anyone programing a safety circuit like this should be shot anyway, unless its a validated safety system i.e. PILZ PLC's where you'd only see a block call anyway.
Never seen hand and foot switches used this way, always two hands only.
The way shown could be tricked with a couple of matches.
Same for footswitches.
Any hand or foot release should imediately stop the machine.
But hey, as already said, anyone programing a safety circuit like this should be shot anyway, unless its a validated safety system i.e. PILZ PLC's where you'd only see a block call anyway.
Never seen hand and foot switches used this way, always two hands only.
The way shown could be tricked with a couple of matches.