A method for monitoring an automation unit with a control unit (3) and several terminals (1,2), whereby the terminal can adopt at least two status values. At least some of the previous status changes can be subsequently reconstructed. The control unit (3) receives a message telegram from one of the terminals...http://www.google.fr/patents/US6895369?utm_source=gb-gplus-shareBrevet US6895369 - Method for monitoring an automation unit
