I did the world's simplest simulink model which sums two constants and send the result to an outport. I exported this to an fmu model and try to run it in pyfmi.
I get an error with FMUException: The simulation failed. See the log for more information. Return flag 3
The log says ['FMIL: module = FMILIB, log level = 5: Allocating FMIL context', 'FMIL: module = FMILIB, log level = 5: Parsing model description XML', 'FMIL: module = FMI2XML, log level = 5: Parsing XML element fmiModelDescription', 'FMIL: module = FMI2XML, log level = 5: Parsing XML element CoSimulation', 'FMIL: module = FMI2XML, log level = 5: Parsing XML element VendorAnnotations', 'FMIL: module = FMI2XML, log level = 5: Parsing XML element ModelVariables', 'FMIL: module = FMI2XML, log level = 4: [Line:31] Detected during parsing:', 'FMIL: module = FMI2XML, log level = 2: Start attribute is required for this causality, variability and initial combination', 'FMIL: module = FMI2XML, log level = 5: Building alias index', 'FMIL: module = FMI2XML, log level = 5: Parsing XML element ModelStructure', 'FMIL: module = FMI2XML, log level = 5: Parsing XML element Outputs', 'FMIL: module = FMI2XML, log level = 5: Parsing XML element InitialUnknowns', 'FMIL: module = FMILIB, log level = 5: Parsing finished successfully', "FMIL: module = FMILIB, log level = 4: Loading 'linux64' binary with 'default' platform types", 'FMIL: module = FMICAPI, log level = 5: Loaded FMU binary from /tmp/bruce/JModelica.org/jm_tmp9uvk5t3l/binaries/linux64/simple_sum2const.so', 'FMIL: module = FMICAPI, log level = 5: Loading functions for the co-simulation interface', 'FMIL: module = FMILIB, log level = 5: Successfully loaded all the interface functions', 'FMIL: module = FMI2XML, log level = 3: fmi2_xml_get_default_experiment_tolerance: returning default value, since no attribute was defined in modelDescription', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2SetupExperiment', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2EnterInitializationMode', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2ExitInitializationMode', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] getReal vr:0, value:5.000000', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] getReal vr:1, value:0.000000', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] CommunicationStepSize=0.02, LocalSolverStepSize=0.2', 'FMIL: module = Model, log level = 2: [error][FMU status:Error] Stepsize must be non-negative and divisible by 0.2', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] CommunicationStepSize=1, LocalSolverStepSize=0.2', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] Local solver will do 5 steps from t = 0.', 'FMIL: module = FMI2XML, log level = 3: fmi2_xml_get_default_experiment_tolerance: returning default value, since no attribute was defined in modelDescription', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2SetupExperiment', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2EnterInitializationMode', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2ExitInitializationMode', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] getReal vr:0, value:5.000000', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] getReal vr:1, value:0.000000', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] CommunicationStepSize=0.02, LocalSolverStepSize=0.2', 'FMIL: module = Model, log level = 2: [error][FMU status:Error] Stepsize must be non-negative and divisible by 0.2', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2SetupExperiment', 'FMIL: module = FMI2XML, log level = 3: fmi2_xml_get_default_experiment_tolerance: returning default value, since no attribute was defined in modelDescription', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2SetupExperiment', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2EnterInitializationMode', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2ExitInitializationMode', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] getReal vr:0, value:5.000000', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] getReal vr:1, value:0.000000', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] CommunicationStepSize=0.02, LocalSolverStepSize=0.2', 'FMIL: module = Model, log level = 2: [error][FMU status:Error] Stepsize must be non-negative and divisible by 0.2', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2EnterInitializationMode', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2ExitInitializationMode', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2EnterInitializationMode', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2ExitInitializationMode', 'FMIL: module = FMI2XML, log level = 3: fmi2_xml_get_default_experiment_tolerance: returning default value, since no attribute was defined in modelDescription', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2SetupExperiment', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2EnterInitializationMode', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2ExitInitializationMode', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] getReal vr:0, value:5.000000', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] getReal vr:1, value:0.000000', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] CommunicationStepSize=0.02, LocalSolverStepSize=0.2', 'FMIL: module = Model, log level = 2: [error][FMU status:Error] Stepsize must be non-negative and divisible by 0.2', 'FMIL: module = FMI2XML, log level = 3: fmi2_xml_get_default_experiment_tolerance: returning default value, since no attribute was defined in modelDescription', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2SetupExperiment', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2EnterInitializationMode', 'FMIL: module = FMICAPI, log level = 5: Calling fmi2ExitInitializationMode', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] getReal vr:0, value:5.000000', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] getReal vr:1, value:0.000000', 'FMIL: module = Model, log level = 4: [info][FMU status:OK] CommunicationStepSize=0.004, LocalSolverStepSize=0.2', 'FMIL: module = Model, log level = 2: [error][FMU status:Error] Stepsize must be non-negative and divisible by 0.2']
I can't find any information on how to set stepsize, or what it should be. I tried model.do_step(0, 1.0) model.initialize(0, 0.1, True)
model.simulate_options() shows {'ncp': 500, 'initialize': True, 'stop_time_defined': False, 'write_scaled_result': False, 'result_file_name': '', 'result_handling': 'binary', 'result_handler': None, 'result_store_variable_description': True, 'return_result': True, 'time_limit': None, 'filter': None, 'silent_mode': False}
How can I get this simple demo to work?