Filling Injector and Method for Operating a Filling Injector

A filling injector for a mold having an injector housing, which has a cylindrical cavity in which a closing piston unit is supported in movable fashion;

• the injector housing has a supply for plastic granules leading to the cavity and at an end oriented toward the mold, has a mold opening for supplying the plastic material to a mold and
• in a closed position, the closing piston unit is slid so far forward that it closes the mold opening and in an open position, is retracted from the cylindrical cavity at least in the region between the supply and the mold opening, wherein
• in or on the injector housing, a sensor is provided for detecting a predetermined detection position of the closing piston unit and a counting device for counting the number of detection positions of the closing piston unit in which it is situated in the predetermined detection position.