Trigger Sensor Based Register Control allows the fine synchronisation of the automatic mark recognition system by immediate finding and holding the register mark position. The Control ensures time and waste saving by automatic and simultaneous adjustment of the length and side register of all printing units. The Control has the feature of good print quality with good register stability by absolute precise register measurement with micro dot marks. The Trigger Sensor Based Register Control ensures good production reliability by cyclic register measurement during production and by alarm signals in case of missing register marks.