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The Map Before the Territory: ISA/IEC 62443, Its History and Its Parts
On her first morning at the Al Sahil Gas Complex, OT cybersecurity architect Priya Raghavan is handed a forty-page vendor questionnaire that says "comply with IEC 62443" eleven times and never says which part. Diego Ferrer, the EPC's lead instrument and control engineer, admits he has been signing those questionnaires for years. Part one of The Deep End's 62443 series walks the whole map: the attacks that made the standard necessary, the committee in Chicago that started it, the four shelves of documents, who each one is written for, the editions current in October 2026, and the misreadings…
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