Valve arrangement and method

A method of operating a valve arrangement for industrial automation, the valve arrangement comprising at least one pneumatic valve module with a module housing, the valve module having a working port, an electric drive device, and at least one actuator element for setting a valve module output pressure at the working port and/or a flow rate through the working port, wherein the actuator element is arranged in the module housing and is positionable by means of the electric drive device, wherein the valve module further has a valve module pressure sensor for detecting the valve module output pressure, the valve arrangement further comprising a diagnostic device which is configured to provide a diagnostic function on the basis of the detected valve module output pressure, the diagnostic function comprising a failure prognosis of the valve module, a compressed air leakage detection, a compressed air consumption detection and/or a compressed air consumer localization, the method comprising the steps of:

• detecting the valve module output pressure;
• and
• providing the diagnostic function based on the detected valve module output pressure.