Provided is a printing plate cylinder to which a sleeve printing plate is detachably attached. The variable homogenizing system may homogenize light projected by a lamp across a light valve. The apparatus further includes means for selecting the size of the RLC PDU. A reference count is also used as a variable by the configuration object to track the number of packets assigned to the configuration. This permits a configuration of the individual module components in relation to one another and with respect to a mounting board with only small positional tolerances.