Sharing of measuring instruments and final component control valves of different SIL levels in the SIS system
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According to specification 50770, for circuits of SIL2 and above, the measuring instruments as well as the final component switches and valves must be separated from the process control system. There’s no problem with that, but I have a question: for circuits of different SIL levels, such as a SIL1 circuit and a SIL2 circuit, can the interlock solenoid valves (which must meet SIL2 standards) be shared? Conversely, can a measuring instrument (meeting SIL2 requirements) be involved in both a SIL1 interlock circuit and a SIL2 interlock circuit at the same time? I kindly ask all the experts to help clarify this.
Sure, one measuring instrument can be shared across multiple interlock circuits； As for the actuator, it usually has one output; as long as the several interlock settings do not conflict with each other, that’s fine
The higher standard takes precedence; the highest standards are the key.
If it’s genuine advice, I’d be more than happy to accept it. If it’s just an act of showing off from a superior position, please read my question first. It was a problem from last year already, and the teacher on the second floor also answered my questions. Thank you all for your replies; please pay more attention to new questions. :lol
I’m sorry, I didn’t see it clearly. All I see are new problems{:2_32:} Never mind, I should stop talking; I’m such a talkative person. When I see silly questions, I always feel like reacting to them! Sorry {:2_43:}