Siemens Aktiengesellschaft

Oswald Kaesdorf

Ulrich Hahn

Markus Gross

Dietmar Wanner

Martin Teckentrup

Peter Jaenicke

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

Uniform distribution of a correction determined by a PLL over the subordinate clock signals is undertaken by dividing a phase-regulated value by the number of subordinate clock signals. Division by way of successive addition is performed such that time conflicts with subordinate clock signals generated in real time are successfully avoided despite the required time duration of such a division. The synchronicity can be further raised by also uniformly distributing a division remainder. A particularly effective implementation of this division employs subsequent rounding for real time use.

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Grossenseebach, Germany

Oswald Kaesdorf