FMI-LS-BUS v1.0 news article and press release

content/news/2025-07-21-FMI-LS-BUS-v1.0-release.md

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+---
+title: Release of FMI Layered Standard for Network Communication v1.0 (FMI-LS-BUS)
+date: 2025-07-21
+aliases: [/news/2025/07/21/fmi-ls-bus-v1.0-release.html]
+---
+
+# The FMI Layered Standard for Network Communication v1.0 has been released - enabling the simulation of virtual ECUs with FMI 3.0!
+
+Increasingly complex supply chains and functional diversity in the creation of virtual ECUs (vECUs) require standardization to ensure the simple and cost-efficient exchange of vECUs for users of Software-in-the-Loop (SiL) testing solutions. FMI is an established standard for creating vECUs already using the FMI versions 1.0 and 2.0, but the capabilities for these applications has been improved significantly with the release of FMI 3.0 in 2022. Additionally FMI 3.0 allows for the specification of layered standards. These are defined based on the FMI 3.0 core standard and extend its capability for specific usage domains, in the case of the new Layered Standard the network Communication of vECUs:
+
+Automotive CAN, LIN, FlexRay, CAN FD, CAN XL and Ethernet are network technologies that have been applied successfully over many years by all automotive OEMs worldwide. Virtualizing electronic control units and then simulating multiple such vECUs requires connecting them using a virtual version of these network technologies.
+
+The layered standard defines what input and output variables and which FMI 3.0 features are used and how to emulate a transport layer for such network traffic. At this point it should be explicitly mentioned that this layered standard not only relates to automotive buses, but can also be extended to buses from other domains in the future.
+
+There are two base use cases enabled:
+
+- Physical Signal Abstraction (or High-Cut) to simply transport physical signal values between virtual ECUs:
+The network properties are largely idealized: Infinite bandwidth, zero-delay etc. Signals, groups of signals and their properties (e.g., units) are usually derived from existing and validated standard network topology description formats, such as DBC, LDF, Fibex and ARXML.
+- Network Abstraction (or Low-Cut) to realize virtualized bus driver implementations:
+This transport layer emulation allows anything from idealized to more detailed network simulations, including bandwidth restrictions, message arbitration and delays. It forwards the network payloads using binary variables. The Low-Cut abstraction layer is meant to allow virtualized bus driver implementations, including feedback from the physical drivers about transmission status or network node states. Since the Network Abstraction layer is protocol-independent, it can also be used for the simulation of non-automotive control units, e.g., from the field of industrial automation.
+
+The FMI Layered Standard for Network Communication (FMI-LS-BUS) has been created in a collaborative effort by a working group within the FMI Project with contributions from Akkodis, AVL, Beckhoff, Bosch, dSPACE, PMSF and Synopsys (in alphabetical order). 
+
+The FMI Steering Committee has now released the version v1.0 of the FMI 3.0 Layered Standard for Network Communication (FMI-LS-BUS) supporting CAN, CAN XL, and published a pre-release of FMI-LS-BS v1.1.0-beta supporting Flexray and an alpha version of Ethernet support.
+
+The new Layered Standard has been heavily tested during the development, and already is supported by the following tools: 
+Altair Twin Activate, dSPACE SystemDesk, dSPACE VEOS, Model.CONNECT, Synopsys Silver, Vector SIL Kit, Vector vVIRTUALtarget (for more information see  https://github.com/modelica/fmi-ls-bus)
+
+The FMI Layered Standard for Network Communication is accompanied by other layered standards to improve the simulation of vECUs: 
+
+- the FMI-LS-XCP (v1.0 released, see https://github.com/modelica/fmi-ls-xcp) which enables the measurements via the ASAM XCP standard, and
+- the FMI Layered Standard for the Structuring of data (FMI-LS-STRUCT, v1.0-alpha available, see https://github.com/modelica/fmi-ls-struct) which defines support for maps.
+
+Together they represent a significant part of the functionality required for carrying out SiL tests in vECUs. 
+They enable the faster exchange of vECUs and give users the option of tool freedom when creating and simulating vECUs. Ultimately, this reduces the process complexity for exchanging and makes it significantly more cost-efficient to create and simulate vECUs. 
+
+We will present the new Layered Standard for Network communication also at the coming "16th International Modelica and FMI Conference" in Lucerne, Sept 8-10 2025, in our talk "FMI Layered Standard for Network Communication: Applications in Networked ECU Development". [Come and meet us there](https://modelica.org/events/modelica2025/)!
+
+## More information: 
+
+- FMI Layered Standard for Network Communication (FMI-LS-BUS) v1.0.0 [(Standard text)](https://github.com/modelica/fmi-ls-bus/releases)
+- FMI Layered Standard for Network Communication (FMI-LS-BUS) [Github repository and Issue tracker](https://github.com/modelica/fmi-ls-bus/)
+- Presentation at the International ASAM Conference 2024: "The Functional Mock-up Interface (FMI), layered standards and ASAM standards - Enabling seamless SiL simulation of vECUs": A recorded presentation with a demonstration in tools from Bosch, Akkodis, Altair, AVL, dSPACE, ETAS, SYNOPSYS [(Slides)](/assets/literature/FMI-LS-ASAM_2024.pdf)[(Video)](https://www.youtube.com/watch?v=KzzKRa3jORs)
+
+## About the Modelica Association
+
+The Modelica Association (MA) is a non-profit organization incorporated in Sweden with the mission to develop open-access, royalty-free, coordinated standards for the development and verification of cyber-physical systems. The open and royalty-free nature of the standards supports a rich eco-system of open-source and commercial solutions. The MA projects provide open-source assets, compliance checkers, and infrastructure to simplify the process of standards adoption, all publicly available under the [Modelica GitHub organization](https://github.com/modelica), and organizes regular open-access conferences, with all papers available on the [Modelica website](https://modelica.org). The Modelica Association standards are endorsed and recommended by many professional societies in the modeling and systems engineering domain: [ASAM](https://report.asam.net),[Prostep IVIP](https://prostep.org), [PDES](https://pdesinc.org), [NAFEMS](https://nafems.org), and [INCOSE](https://incose.org).
+
+## Contact information
+
+### Modelica Association
+
+<img width="200px" align="right" src="https://raw.githubusercontent.com/modelica/MA-Logos/master/LowRes/Modelica_Association.png" alt="Modelica Association logo"/>
+
+Website: [https://modelica.org/](https://modelica.org/)
+
+Email: [[email protected]](mailto:[email protected])
+<br/><br/>
+
+### Modelica Association Project FMI
+
+<img width="200px" align="right" src="/docs/3.0/images/FMI_logo_horizontal.svg" alt="FMI logo"/>
+
+Website: [https://fmi-standard.org/](https://fmi-standard.org/)
+
+Email: [[email protected]](mailto:[email protected])
+
+FMI Project Leader: Christian Bertsch, Robert Bosch GmbH
+
+FMI Steering Committee Members: AVL List GmbH, Austria; Robert Bosch GmbH, Germany; Dassault Systèmes, France, Germany, and Sweden; dSPACE GmbH, Germany; ESI ITI GmbH, Germany; Maplesoft Inc., Canada; Modelon AB, Sweden; PMSF, Germany; Siemens PLM Software, France; Synopsys, USA, Germany and Romania
+
+