Container with LS-BUS enable FMUs¶

Step-by-step example¶

The topology supported be fmucontainer require a BUS Simulation FMU. (See 3.2.2 of LS-BUS specification).

1. From LS-BUS Examples build 2 nodes node1.fmu and node2.fmu) and the Bus Simulation bus.fmu.

2. Create a bus+nodes.json file describing the container. In this example, it connects node1.fmu to bus.fmu through their terminals and the same for node2.fmu.

       {
         "name": "bus+nodes.fmu",
         "fmu": [
           "bus.fmu",
           "node1.fmu",
           "node2.fmu"
         ],
         "link": [
           [ "node1.fmu", "CanChannel", "bus.fmu", "Node1"],
           [ "node2.fmu", "CanChannel", "bus.fmu", "Node2"]
         ],
         "step_size": 0.1
       }
   

3. Create the container with the following command line

   fmucontainer -container bus+nodes.json -fmi 3
   

4. You could run the bus+nodes.fmu with you're favourite FMI-importer. Here is a

   from fmpy.simulation import simulate_fmu
   
   def log(*args):
       msg = args[-1]
       if isinstance(args[-1], bytes):
           msg = msg.decode('utf-8')
       print(f"{msg}")
   
   
   simulate_fmu("bus+node.fmu", step_size=0.1, stop_time=1,
                output_interval=0.1, validate=True, use_event_mode=True,
                logger=log, debug_logging=True, relative_tolerance=1e-6)