Research On Method Of Proof Test For Functional Safety Of Safety Controller And Test Instrument

As the core part of safety related system, safety controller is widely used in petrochemical industry, rail transport, aviation industry and other fields. Safety related system built with safety controller can perform its safety function properly to avoid heavy casualties and property loss before the occurrence of hazardous event. It is an important measure to ensure production safety. Because of the system architecture, hardware, software and poor environment and other reasons, safety controller may also fail. And it always works in a passive state, so its failure can't expose itself. Therefore, it is of significance to research on proof test method for safety controller and developing an intelligent test instrument.In this paper, the method of proof test for safety controller was given, which include confirmation of test object,test period and test process. A design framework of a portable intelligent functional safety proof test for safety controller was presented. Based on this a portable functional safety proof test instrument was developed. Embedded system was used to develop the instrument. It based on the ARM9 processor to complete data acquisition, data analysis, and processing, which can simulate field devices to transmit fault signal, detect output response and communicate; Based on the Linux operating system and Qt/Embedded, the software system was built to achieve test function and good human-machine interface.The results of experiments show that the method of proof test for safety controller is reasonably practicable, the test instrument with high accuracy output can simulate fault signal properly, complete proof test better and improve the test efficiency.