Electropneumatic trailer control-valve unit

A method for controlling an electropneumatic trailer control-valve unit the method comprising:

• receiving a supply control pressure at a protection-valve control port of a pneumatically switched trailer protection valve of the electropneumatic trailer control-valve unit, the trailer protection valve being configured to switch from a first switching position into a second switching position if the trailer operating pressure exceeds a predetermined first threshold value;
• and
• switching the trailer protection valve from the first switching position into the second switching position,
• wherein the electropneumatic trailer control-valve unit comprises:
• a storage port for coupling a store of compressed air for a trailer;
• a brake-pressure port;
• a brake-pressure pilot-control unit configured to output at least one first control pressure;
• a brake-pressure main-valve unit configured to receive the at least one first control pressure and to output a brake pressure at the brake-pressure port;
• a trailer operating-pressure port configured to receive a trailer operating pressure, and
• a redundancy port at which a redundancy pressure is capable of being output,
• wherein the protection-valve control port is connected to the trailer operating-pressure port for receiving the trailer operating pressure,
• wherein the redundancy pressure is connected to the trailer protection valve in such a manner that in the second switching position of the trailer protection valve the redundancy pressure is capable of being transmitted to the brake-pressure main-valve unit, and
• wherein the trailer operating pressure is the supply control pressure.