According to the present disclosure, a coupling plate is provided to form electrical, electronic, hydraulic and/or pneumatic connections. The coupling plate comprises an approximately flat base plate, at least two hydraulic connecting devices formed in the base plate, at least one electronic connecting device to provide an electronic connection between a control device of a vehicle and a control device of an accessory device, at least one electrical connecting device, a centring device with at least two coupling and/or counter coupling elements for the relative alignment of the connecting devices of the coupling plate and, if necessary, corresponding connections.