Siemens Aktiengesellschaft

Siemens Industry Software Gmbh

Robert Winter

Moshe Hazan

Michael Schlereth

Guy Barak

Gal Snir

Werner Herla

Gilad Milman

Frederik Heuser

Johannes Ottermann

Michael Engel

A method synchronizes first and second simulation systems, each operating in a free running operation thereby exchanging data to run the simulation systems. The method includes: a) providing the first simulation system (PLCSIM) being enabled to run in cycles at a linear speed determined by repeatably setting a scaling factor (s); b) providing the second simulation system (Process Simulate) to run in cycles at different speeds; c) the second simulation system requests at the end of a cycle a virtual time stamp from the first simulation system; d) calculating on the basis of the virtual time stamp a virtual duration time Atand on the basis of the virtual time stamp after completion of the cycle of the second simulation system a virtual duration time At; and e) calculating an update sn+1 for the scaling factor according the most recent scaling factor smultiplied by At/At.

Method and a system for synchronizing a first and a second simulation system

A programmable logic controller (PLC) with changing memory access times is intended to interact with a subordinate system, i.e., a discontinuous virtualized system, wherein a computation apparatus is provided, in which the PLC is implemented and in which the system that is subordinate to the PLC with respect to an operation to access the memory access is implemented. A memory to which a component of the PLC has access is integrated in the PLC. Also implemented in the computation apparatus is a proxy device that coordinates access to the memory of the PLC by the subordinate system such that simultaneous access by the component of the PLC has priority over access by the subordinate system and it is thus possible to ensure that the PLC always complies with a predefined cycle time of the PLC.

Computation apparatus with coordination of the access to an internal memory and operating method

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Velburg, Germany

Robert Winter