Iec 61508-7 May 2026

At the post-mortem, Elena asked the room: “Why didn’t we think of this before?”

Not fancy. Not new. Just a table. On the left: “Technique.” On the right: “Recommended SIL.” Buried in the footnotes: iec 61508-7

“It’s in the standard,” I said, sliding the open binder toward her. Page 147. Table C.5: “Diverse programming – Recommended for SIL 3 and SIL 4.” At the post-mortem, Elena asked the room: “Why

“Because we only read the parts that tell us what to do. This part tells us how to think.” At the post-mortem

“How long?”

She meant the Safety Lifecycle phase. But I heard the unspoken accusation: You didn’t think of everything.

“Eight weeks. No hardware spin. Just a second firmware image and a comparator.”