Operational Semantics of Reflex

Abstract

Reflex is a process-oriented language that provides design of easy-to-maintain control software. The language has been successfully used in several safety-critical cyber-physical systems, e. g. control software for a silicon single crystal growth furnace. Now, the main goal of the Reflex language project is development a support for computer aided software engineering targeted to safety-critical application. This paper presents formal operational semantics of the Reflex language as a base for applying formal methods to verification of Reflex programs.

Reasoning About Programmable Logic Controllers

“…Actions may have guard conditions depending on the hyperprocess variables and functional states of other processes. Our definition of the hyperprocess transition system is based on a description of the hyperprocesses and the operational semantics of the Reflex language [1,7]. We hide the output phase inside the execution phase without loss of generality.…”

“…The long-term goal of our work is formal verification of control software specified in the process-oriented paradigm, in particular programs written in the Domain-Specific Language (DSL) Reflex [1,7]. Formal verification of Programmable Logic Controllers (PLCs), which are important components of automatic control systems, is an active topic of practical and research work [2,4].…”