Emergency alarm cancellation switch, function - GF82.25-P-4101-04T

The emergency alarm system cancel button (S62/5)  is monitored by the multifunction control unit for special-purpose vehicles (MSS) (N26/9).  If the emergency alarm system cancel button (S62/5) is pressed, the input of the special vehicle multifunction control module (MSS) (N26/9)  is short-circuited to ground. With this an emergency alarm is canceled.

For line monitoring  purposes the emergency alarm system cancel button (S62/5) has a resistor (sensing resistor) connected in parallel. A small test current flows through this resistor when the emergency alarm system cancel button (S62/5) is at rest. When the current drops below a defined threshold this indicates an open circuit.