S
I was wondering how can IS barriers affect safety functions on a SIS. I would assume that the failure rates of the barrier need to be included in the loop analysis to determine the integrity level (SIL). However I wonder if there is any preference or recommendation between using active barrier rather than passive barriers on a de-energized to trip system. If it is possible to use active barrier for analog transmitters, does anybody know of a logic solver that support connection of 4-wire devices? (I think that from point of view of the logic solver, an active barrier looks like a 4-wire device)
Thanks,
Sergio
Thanks,
Sergio