In a rollercoaster trigger system to output a data signal to a control unit for triggering and controlling an event at a predetermined track position, a beacon plate with a certain aperture pattern and a sensor set is provided to send a trigger signal and a data signal to the control unit. The sensor set includes a first and a second trigger sensor which provide together the trigger signal to readout the data of the beacon plate when together simultaneously detecting a first and second trigger aperture of the aperture pattern. A read sensor is provided for reading data from the aperture pattern by detecting a presence or absence of a read aperture. The data signal is obtained by the control unit when the trigger signal is generated.