Software Structure Design And System Safety Validation Of Smart Transmitters Based On IEC 61508

As the expansion of industrial manufacturing and complication of control system, safety attracts so much attention that functional safety becomes a hot spot in the field of industry. So there is practical significance to the research of functional safety of the smart transmitter which is typical in the process industrial field.This paper begins with the background and significance of functional safety, and then rules that include the safety function of the smart transmitter is detection function, the target SIL is grade 2, the E/E/PES structure is 1oo1 D structure, are determined after introduced IEC 61508 which is the functional safety standards and the smart transmitter based on HART protocol which is the object of this study.Several techniques and methods such as modular approach, semi-formal methods, and fault diagnosis and so on, are selected and used in the development process of software of the smart transmitter according to IEC 61508-3.The results of verification after designing indicate that the used techniques and/or methods are effective; then diagnostic coverage rate is in the interval (60%,90%) through fault injection testing which is according to the requirements of SIL2; the comparison on safety failure fraction which is the key parameter to determine SIL between smart transmitters of this paper whose SFF is 88.3% and two types whose SFF are 88.4% and 88.7% of 3051S series reflects that the techniques and/or methods used in this paper are applicable to the research of functional safety of the smart transmitter.