Two Locks on One Door: IEC TR 63069 Safety and Security Co-Engineering, the Security Environment, and IEC TS 63074 for Machinery

Deep End Era. Engineering with Sankalp · Oct 28, 2026 · 1h 14m

Priya Raghavan, the OT cybersecurity architect, and Tomás Iglesias, the DCS and SIS integration engineer, discover that the safety instrumented system at Al Sahil was assessed to a SIL, and secured to a security level, by two teams who never compared notes. They spend a week making the two assessments talk to each other. Part five of The Deep End's IT and OT security series.

Chapters

00:00:00 Cold open: two reports in two binders

00:06:49 Two cultures, one plant

00:13:28 The security environment: a fence around the safety case

00:19:52 Guiding principles: what the report asks you to believe…