Frequently Asked Question

Is it possible to select the HFT constraints routes, subsystem wise, instead of applying it only to the whole SIF? i.e. Route 2H-61508 for “S”, Route 1H-61508 for “Logic Solver” and clause 11.4.5 IEC61511 2nd edition for “Final Element”​?
Last Updated a year ago

You will still choose IEC 61511 or IEC 61508 for the entire SIF, however for logic solvers IEC 61508 is always used. If you choose IEC 61508, either Route 1H or 2H will be applied depending on the equipment in the leg.

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