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Low Level interlock trigger pump pushbutton to shutdown the motor

Low Level interlock trigger pump pushbutton to shutdown the motor

Low Level interlock trigger pump pushbutton to shutdown the motor

(OP)
Dear Sir
I wonder how to show the right way that the software signal from interlock to shutdwon the motor. Please see the attached drawing.

case 1 : As liquid level's low low, the singal will interlock through the pushbutton to stop the motor, and the pushbutton only be activated as interlock happen.

case 2 : As liquid level's low low, electrical singal will interlock to stop the motor, and operator also can stop the motor through pushbotton.

case 3 : The signal form interlock to motor is electrical signal instead of software signal

Could anyone please help me to tell which cases is right cause sometime I saw different cases can describe the same interlock scenario? For exampe, We use case 1 & 2 in our porject to descripe the tank liquid's low low, and the pump stop.

Thank you very much for your generours help.

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