Siemens Aktiengesellschaft

Dieter Brueckner

Dieter Klotz

Karl-Heinz Krause

Juergen Schimmer

Franz-Josef Goetz

Johann Arnold

Karl Weber

Herbert Bernecker

Matthias Schweikart

A method for transmitting real time data packets in a cyclic communication system, each transmission cycle having a first partial cycle (IRT-Z) for a real time communication portion and a second partial cycle (NRT-Z) for a non-real-time communication portion. The method includes determination () of a cycle number and processing of a transmission sequence of real time data packets in the first partial cycle. The transmission sequence is composed of one or more partial sequences (1, 2, 3, 4, 5), and the composition depends on the cycle number.

Method for transmitting real-time data messages in a cyclic communications system

A method for the transmission of data messages in a switched cyclical communication system () with a linear or ring arrangement of the users. Real-time critical data messages are transmitted in a first segment () of a transmission cycle (), without the need to first plan the send and receive instants in the forwarding users, such that the chronological start () of the first segment () of a transmission cycle () is guaranteed by all users in all transmission cycles through monitoring. The duration of the first segment () of a transmission cycle () can be fixedly specified or automatically adjusted using a timeout procedure.

Method for transmission of data telegrams in a switched cyclical communication system

The method carrying out permanent redundant transmission of data messages in disjunctive paths, such that circulating data messages can be reliably identified and destroyed. The method includes splitting a redundant message into two data messages in the respective branching point in a transparent manner. The method further includes causing no additional load for the receiver of the two identical messages by, for instance, allocating a current cycle number to the received data message in a cyclic communication system (). This can also be ensured in a non-cyclic communication system by means of software processing, for instance, by processing the header identifier of the data messages. In particular, the behavior of the communication system () with respect to 'learning' the addresses in the individual users (), more particularly the switches, is not altered for the remaining non-redundant data traffic.

Method for permanent redundant transmission of data messages in communication systems

A subscriber in a communication system () for transmitting and receiving data telegrams, wherein a data telegram includes reference data or user data and an identifier. The control of transmitting and receiving data telegrams is based on check data sets (). A check data set includes an address for the reference data or user data and the identifier of the data telegram, which is assigned to the check data set. A transmission list () includes a first number of check data sets. A circuit unit () generates, based on a check data set of the transmission list, a data telegram to be transmitted. In addition, a second number () of check data sets is provided. An assignment unit () assigns a received data telegram to one of the check data sets of the second number of check data sets, wherein the assignment is carried out based on the identifier for the received data telegram.

Subscriber device for a high-performance communication system

A method for receiving data messages in communications systems having redundant network paths. Received data of a peripheral representation or image is routed to a node along at least two different network paths. This makes it possible to store a consistent peripheral representation or image in a memory () of a node, if there is a disturbance in the data transmission along one network path.

System and associated method for receiving data telegrams in communication systems having redundant network paths

A method for arbitrating access to a data bus among subscribers or bus devices (Tn,Tn, . . . ), wherein the bus devices are coupled by at least one arbitration ring (). The method comprises the following steps: a) requesting access by a first bus device; b) checking whether a first signal, which indicates that the arbitration ring is enabled, is present at an input () of the first bus device; c) if the first signal is present, outputting () a second signal by the first bus device; d) checking whether, at the end of a predetermined time period, the first signal is still present at the input () of the first bus device; and e) if the first signal is still present at the end of the predetermined time period, accessing the data bus by the first bus device.

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Unterleiterbach, Germany

Dieter Brueckner