Siemens S7-414F
Siemens S7-414F
(OP)
Hello all,
For a safety critical application (SIL 2, possibly SIL3) Siemens have suggested S7-414F. Is there some experience in the group in using this PLC
For a safety critical application (SIL 2, possibly SIL3) Siemens have suggested S7-414F. Is there some experience in the group in using this PLC





RE: Siemens S7-414F
RE: Siemens S7-414F
RE: Siemens S7-414F
One of the problems that we have (as I see it anyway) is that our company has not taken the time to define the criteria for SIL1 or SIL2. For that matter there are not many of us that even understand what an SIS or SIL level is (to clarify something- Our parent owns a high percentage of the nuclear power plants in this country. I feel quite sure that they completely understand the terms and properly implement their SIS designs. Unfortunately (or possible fortunately) we do not get the benefit of trickle down engineering. Based on a risk ranking example (qualitative) that is given in the book Safety Shutdown Systems: Design, Analysis, and Justification we would not require greater than SIL2 and even that would be rare. 99% of the time the risk ranking qualitative example would yield an answer of "no SIS required". However, unless we define our own criteria I don't see how, even though we sometimes do, we can ever correctly make the determination that one of our process's is SILX.
Sorry for cluttering your post with my corporate dirty laundry and thanks again for responding.
RE: Siemens S7-414F