Safety Evaluation of Fail-Safe Fieldbus in Safety Related Control System

Abstract

The paper deals with the problem of modelling safety features of the safety Fieldbus transmission system used within safety related control systems. The basic principles of the modelling failures effect upon the safety of closed transmission system and standards used in the process of safety evaluation are summarized in the paper. The practical part is oriented to a description of a realized Markov model for determination of the random failures effect on the safety of a closed transmission system. The model reflects the safety analysis of failures effect caused by electromagnetic interference in the communication channel and random HW failures of the transmission system. In the paper the results of simulation of parameters of the transmission system are discussed, such as the probability of an undetected corrupted message.

Improving the Hybrid A* method for a non-holonomic wheeled robot

“…Then, the most critical factor is the safety of the communication, which has to be evaluated separately. 13…”

Modelling of Failures Effect of Open Transmission System for Safety Critical Applications with the Intention of Safety

“…In this paper authors deal only with a mathematical procedure to quantify this particular failure rate. Calculations of dangerous failures rates λD(1), λD (2), λD(3) are taken from [9] respectively from results in [13], [14] stemming from authors experiences gained during years of practice in this field of expertise. Hardware errors of untrusted transmission system can lead to undetected errors during message transmission in case of simulations failure of detection properties of the safety code.…”

Performing safety functions to monitor the protected area using a light curtain

“…In order to determine the achieved SIL for specific components, their involvement, parameters and communication links, a suitable model should be developed. This issue is addressed by many publications [7], [8], [9], [10], [11], [12].…”