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The stop-function is for normal operation, e.g. stopping a drive by mechanically disengaging it. The emergency-stop generally deenergizes the entire machine.
In our industry applications E-Stops are used to remove the control voltage to the control circuit. This prevents anyone from issuing a start command either remotely (control room), locally (at the MCC (Motor control centre)) or in the field.
The E-Stop switch is usually also a mechanical latching type switch, that requires you to turn the knob before it will release. Additional safety feature.
The Stop pushbutton is wired in series with the control relay (a N/C switch) and once the stop pb is pressed, power will be removed to the relay, the contacts open up and power is removed from the drive.
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