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The Pressure Pad is an Object that emits a logical impulse (logical 1/activation order) whenever somebody steps on it. It does not distinguish between Prisoner, Guard, or any other member of Staff.
It can be connected to a Door Servo so that it opens the door whenever someone steps on the pad. It will do nothing if the door is locked shut because of a Lockdown or manually done.
It only needs a one-way connection, from the pad to the servo or any Logic Object.