Method of guaranteed reception of common signals in an avionics system comprising a plurality of electronic computers

A method of guaranteed reception and of processing of an “event” in the form of a digital signal in an avionics system comprising a plurality of electronic computers linked together by a data bus, each computer comprising data processing electronics,

• wherein each electronic computer comprises one and the same software layer, which, on receipt of an event, carries out the following steps:
• at a first instant, sending to each of the other electronic computers of a first signal (ACK) attesting the reception of the said event by the said electronic computer, one and only one of the electronic computers sending a stamp representative of the said first instant;
• a second instant termed “TimeOut ACK”, if the said electronic computer has not received at least one of the first signals emanating from one of the other electronic computers, sending of a second so-called failure signal (FAIL) to each of the other electronic computers attesting the absence of reception of the said first signal;
• t a third instant termed “TimeOut GARANTEED”, if a second so-called failure signal has been received by the said electronic computer, absence of taking into account of the event by the said electronic computer and if no failure signal has been received by the said electronic computer, taking into account of the event, according to the temporal order defined by the stamp, by the data processing electronics of the said electronic computer.