Implementation of control systems using B action systems: a case study
Nordic Journal of Computing
Model Checking Safety-Critical Systems Using Safecharts
IEEE Transactions on Computers
Modeling and automatic failure analysis of safety-critical systems using extended safecharts
SAFECOMP'07 Proceedings of the 26th international conference on Computer Safety, Reliability, and Security
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This paper presents the experiences of using a symbolic model checker to check the safety properties of a servo-loop control system. Symbolic model checking has been shown to be beneficial when the system under analysis can be modeled as a finite state machine. Servo-loop control systems are typically represented by differential equations (Laplace transforms) 驴 not as finite state machines. However, the control loop is only a part of the software system needed to properly and safely operate the system. This paper first validates the safety of the servo-loop using control theory and simulation. Then, a simplestate model of a servo-loop is combined with the state model of entire system. This model is then entered into a model checker (SMV) along with safety predicates. The model checker is used to validate the safety predicates. This paper shows via a concrete example that safetyissues can be discovered and defined for control systems using a model checker. Furthermore, it demonstrates that effective hazard analysis may require multiple techniques.