Siemens Aktiengesellschaft

Peter Jaenicke

Ulrich Hahn

Markus Gross

Martin Teckentrup

Oswald Kaesdorf

For real-time communication between a number of network subscribers in a communication system using Ethernet physics, the slave units are synchronized to the master unit in that each slave unit is clocked via a respective timer with a predetermined overall cycle time, which timer is set cyclically by the reception of respective slave-specific synchronization information which is determined by the master unit. In this case, each timer in a slave unit automatically starts a new cycle once the predetermined overall cycle time has elapsed, even in the absence of the respective synchronization information. Access control for the transmission mode and reception mode between the network subscribers is provided using a timeslot access method.

Method for real-time communication between a number of network subscribers in a communication system using ethernet physics, and a corresponding communication system using ethernet physics

In a control loop comprising a motor, a power section, a motor sensor and a control unit, an electrical circuit is also closed by producing an electrical connection between the motor and the motor sensor. Safe electrical isolation in such a control loop is preferably overcome by means of parasitic capacitances. The control unit transmits a feature, preferably via the power section, which feature is passed to the control unit once again from the other direction. This feature need not be an identity in the sense of a number, and a pulse which can be identified uniquely is sufficient. This allows a technically very effective implementation of a comparison of the control loop structure with the actual wiring, by the control unit evaluating the motor sensor to determine whether the pulse has occurred.

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Erlangen, Germany

Peter Jaenicke