Automatic Conformance Testing of Safety Instrumented Systems for Offshore Oil Platforms

摘要

Functional failures in Safety Instrumented System (SIS) of offshore platforms may have catastrophic consequences for the production, facility, environment and health. This work presents a method for automatic conformance testing of safety specifications represented in a Cause and Effect Matrix (CEM) for Programmable Logic Controllers (PLC) in charge of SIS. Test cases are automatically designed from the CEM using a CEG-BOR strategy to enhance coverage of black box test. Petri Net models support the automated oracle creation and test result evaluation. An experimental tool has been developed to edit the CEM, to generate and execute test cases on a PLC simulator, to generate and execute the Petri Net oracles and to present the verdict. The method has been applied to test the SIS of an offshore oil platform.