The invention relates to a
coating device for applying a flowable medium, in particular a hot-melt
adhesive, to a substrate, having a
coating valve (13) which has a closure mechanism which opens a metering opening of the
coating valve in an open position, so that flowable medium can flow through the metering opening towards the substrate, wherein the closure mechanism can be moved from a closed position, in which it closes the metering opening, into the open position by means of an
electromagnet of the coating valve (13), and having a main
control unit (17), in particular an SPS (
programmable logic controller), which is connected to the coating valve (13) and which provides an electrical output
voltage signal in order to control the
voltage supply of the
electromagnet, in particular periodically, which moves the closure mechanism into the open position and holds it there. The invention is characterized in that a modification unit (19) is arranged between the main
control unit (17) and the coating valve (13), which is configured such that it receives, modifies and continues to pass on the output
voltage signal of the main
control unit (17) to the
electromagnet in modified form.