The invention pertains to a diagnostic device for a fluidic device (11, 12, 23), in particular for a valve array and or a maintenance unit. Furthermore, the invention pertains to a fluidic device (11, 12, 23) equipped with said diagnostic device. The diagnostic device preferably can be locally attached to the fluidic device (11, 12, 23). It features a diagnostic module (34) to determine at least one wear parameter (38b-40b,44) causing wear on the fluidic device (11,12,23) and for reporting of at least one wear status ascertained on the basis of the at least one wear parameter (38b-40b,44).