Patent ID: 6813664
Filing Date: 2004-11-02
Classification: G05B,H04L,Y02P

Abstract:
Method for operating a user terminal in a network wherein data is transmitted in equidistant cycles, the network having a user terminal with a communications processor and with an arithmetic unit that accesses memory, comprising:the communications processor performing the cyclic data transmission by either or both (i) reading the data from a memory in a cyclic part (ZYK,x) of each of the cycles (Z,x) and transmitting the read data to other user terminals or (ii) receiving the data from other user terminals and writing this data into a memory; the communications processor sending at least a first synchronization signal (16) respectively at a fixed instant (Tsx) of each cycle (Z,x) to the arithmetic unit, the arithmetic unit being configured to release the first synchronization signal; blocking the first synchronization signal (16) after the first synchronization signal has been sent, and the arithmetic unit releasing the first synchronization signal only when the arithmetic unit fails to access the memory within the cyclic part (ZYK,x); determining a time interval (&Dgr;Tâ€²sx,xâˆ’1; &Dgr;Tâ€²ex,xâˆ’1) between two successive first synchronization signals; and detecting and signaling an access without access authorization if the time interval is greater than a duration (TDP) of each cycle (Z,x).