Siemens Aktiengesellschaft

Georg Haller

Herbert Barthel

Andreas Maximilian Schenk

Hartmut Schuetz

Markus Walter

Wolfgang Schmauss

Hartmut Schütz

Rainer Mattes

Thomas Peter

Alfons Göbel

The invention relates to a method and a system for detecting errors in the communication of data from a transmitter to at least one receiver. In the method, in a first step on the side of the transmitter a first check value is generated at least from user data to be communicated; in a second step on the side of the transmitter a second check value is generated at least from the user data and the first check value; in a third step at least the user data, the first check value and the second check value are communicated to the receiver; in a fourth step on the side of the receiver the communicated user data and the communicated first check value are verified with the aid of the second check value; and in a fifth step on the side of the receiver the communicated user data are verified with the aid of the first check value. To improve the detection of errors in the communication of data from the transmitter to the at least one receiver it is proposed that, in the first step, the user data are modified to generate the first check value, in the second step the unmodified user data are used to generate the second check value, in the fourth step the unmodified communicated user data are used, and in the fifth step the communicated user data are modified according to the modification in the first step for checking with the aid of the first check value.

Detection of errors in the communication of data

Device () for controlling and/or monitoring external technical processes, in particular a device for use in connection with safety-related controls. The device includes an input functionality, an output functionality and a processing functionality that can be connected with at least one higher-level unit () for transfer of process-influencing and/or process-monitoring signals by way of a bus system () to and/or from actuators () and/or sensors () connected to the device. A guaranteed response time over the bus system () is determined on one hand by the cycle time of the higher-level unit () and on the other by the signal cycle time over the bus system () itself. In order to provide a shorter response time than this in appropriate circumstances, the device () uses the processing functionality thereof to execute logical links internally. The results are available for process control and/or process monitoring after a time interval that is shorter than the guaranteed response time of the higher-level unit () over bus ().

Device for controlling and/or monitoring external technical processes

Growing community of inventors

Erlangen, Germany

Georg Haller