Co-Simulation Sample Clauses

Co-Simulation. Execution A co-simulation can be performed by the XXX as shown in Figure 16, where transitions to the two states User configuration configured and User simula- tion start-end time configured are triggered by the user through the INTO- CPS Application by calling one of the initialize or simulate com- mands from the protocol described in Appendix A. The state machine Initialize is shown in detail in Figure 17. It shows the phases through which the XXX goes as it initializes for a given simulation. The Simulate state represents the simulation proper, and is shown in detail in Figure 18. Initial user input User configuration configured User simulation start-end time configured user input Initialize Simulate [error] [error] Simulation Completed Initialization Error Simulation Error Figure 16: Top level state machine of the XXX. The Initialization State The state machine starts by reading all model description files embedded in the FMUs and validating their structure using the schema from the FMI standard. In addition to this, it also validates them using the semantic rules obtained from the textual description of the FMI standard (i.e. rules which cannot be enforced by schema-based validation). These include how scalar variables may be configured with their attributes, and how the model structure must be laid out. After the model descriptions are validated, the XXX uses the co-simulation configuration supplied by the user, through the INTO-CPS Application, to configure inputs and outputs of all FMUs, checking that all connections are valid, and caches these in lookup tables for execution. Then the libraries implementing the FMU behaviour are extracted from the FMU zip archives and dynamically loaded, followed by creation of all required FMU instances. The number and name of the instances are obtained from the cached con- nection tables. Finally, the XXX extracts the log categories from the model description of each FMU and returns these, together with a session ID, to the INTO-CPS Application. The Simulation State The simulation state machine shown in Figure 18 can only be entered if the XXX has initialized the current session and if the user has supplied the required start and the optional end time, and the optional set of activated logging categories. It starts by setting the logging categories, if supplied, followed by experiment setup, setting start and op- tionally end times, allowing the FMUs to allocate internal memory for the simulation. Initialization ...