Requirements Specification for Process-Control Systems
IEEE Transactions on Software Engineering
The B-book: assigning programs to meanings
The B-book: assigning programs to meanings
Formal Specification and Synthesis of Procedural Controllers for Process Systems
Formal Specification and Synthesis of Procedural Controllers for Process Systems
What is in a Step: On the Semantics of Statecharts
TACS '91 Proceedings of the International Conference on Theoretical Aspects of Computer Software
Designing a Requirements Specification Language for Reactive Systems
ZUM '98 Proceedings of the 11th International Conference of Z Users on The Z Formal Specification Notation
Invariant-Based Synthesis of Fault-Tolerant Systems
FTRTFT '00 Proceedings of the 6th International Symposium on Formal Techniques in Real-Time and Fault-Tolerant Systems
From Implicit Specifications to Explicit Designs in Reactive System Development
IFM '02 Proceedings of the Third International Conference on Integrated Formal Methods
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With the advent of comprehensive safety standards for software intensive safety related systems, such as IEC 61508 and its speciali-sations for particular industry sectors (medical, machinery, process, etc), there is a need to establish combinations of techniques which can be used by industry to demonstrate conformance to these standards for particular developments. In this paper we describe one such combination of techniques, involving statecharts and B, which is aimed at reactive control system development. We define strategies for controller decomposition which allow safety invariants to be distributed into subcontroller requirements, and define techniques for the automatic synthesis of controllers from invariants. A case study of a train control system is used to illustrate the ideas.