I would strongly recommend that your Estops directly shut down the 
machine. Even if the computer crashes, Estop should still work. If the 
machine starts removing parts of your anatomy you want to know that 
Estop WILL shut it down no matter what else happens.

To run multiple switches, the best bet is to use normally closed 
switches and run them in series. If any one switch breaks the circuit 
the machine stops.

Les



On 21/09/10 10:23, Mark Wendt wrote:
> external
> estop switch that I'd like to activate.  The current working estop is on
> the control box and is hooked in through pin 10 on parallel port 0.
> Works fine, lasts a long time.  The pendant estop switch is hooked in
> through pin 15 on parallel port two.  I've tried a number of different
> things - different variable names, but it seems the
>    


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