Grant Agreement: 644047 INtegrated TOol chain for model-based design of CPSs Foundations of the SysML profile for CPS modelling

Deliverable 2.2a report on work carried out in Task 2.1 in Year 2 of the INTOCPS project. The objective in this is to give semantics to SysML to enable it to be used as the entry-level modelling notation for the INTO-CPS tool chain. This entails extracting structural information from SysML models and carrying out some healthiness checks. We report on our approach to verify the healthiness and well-formedness of an architectural design, expressed using a profile of SysML. Our checks guarantee the conformity of component connectors and the absence of algebraic loops, necessary for co-simulation convergence. The checks are carried out using a combination of theorem proving and model-checking using the Isabelle/HOL proof assistant and the FDR3 refinement model checker. We instantiate our approach by applying it to the engineering of mobile and autonomous robot applications; current practice suffers from costly iterations of trial and error, with hardware and environment in the loop. We propose the adoption of an approach to simulation and co-simulation, where designs, and (co-)simulations are traceable and amenable to verification. In this approach, designs are composed of several constituent models whose relationship is defined using our INTO-CPS SysML profile. Our approach supports automatic generation of simulations, and validation and verification beyond what can be achieved with simulation.