METHOD FOR THE FUNCTIONALLY SECURE TRANSMISSION OF A BROADCAST MESSAGE, AND AUTOMATION SYSTEM

摘要

The invention relates to a method for the functionally safe transmission and reception of a broadcast telegram (T _BC ) with safety-relevant data (Safe _Data ), the broadcast telegram (T _BC ) is sent out by a transmitter (S) and received by several receivers (E1, E2), whereby a time master (UM) is operated with a master clock (MUhr) and the transmitter (S) is operated cyclically Sends a synchronization telegram (T _ZS ) with the current time (AKT) to the master clock (MUhr), whereby a sender clock (SUhr) of the sender (S) with the master clock ( MUhr) is synchronized, whereby the receivers (E1, E2) receive a time telegram (T _akt ) with the current time (AKT) of the master clock (MUhr), whereby with the sending of the request telegram (T _A1 , T _{A1 < / sub>) a time counter (Z1, Z2) is started with which a delay time (D1, D2) is determined when the requested time telegram (T akt ) arrives in the receiver (E1, E2), with the current time (AKT) of the master clock (MUhr) plus the delay time (D1, D2), a receiver clock (EUhr1, EUhr2) is set or synchronized, the broadcast telegram (T BC ) when the broadcast telegram (T BC ) a send time (t send ) is added by means of the sender clock (SUhr), and when it arrives at the receiver (E1, E2) a receive time (t < sub> receive} ), whereby the recipient (E1, E2) accepts the safety-relevant data (Safe _Da-ta ) as valid data if there is a difference between the time of receipt (t _receive ) and the send time (t _send ) has not exceeded a specifiable limit value (ΔD).