Postal Service and Grammar: IEC 62264-6 Messaging and the Unified Namespace

Deep End Era. Engineering with Sankalp · Oct 29, 2026 · 56m

Two diagrams on one whiteboard: Leila Darwish's ISA-95 pyramid and Tomás Iglesias's Unified Namespace hub. Part six of The Deep End's Enterprise-Control Integration series explains IEC 62264-6:2020, the messaging service model, and settles the argument about whether a Unified Namespace replaces ISA-95, completes it, or is ISA-95 with a broker. Along the way: MQTT's pipeline origins, Sparkplug, quality of service, broker zoning under IEC 62443, a stale tank level that sent trucks to an empty tank, and what an EPC should write into an integration specification.

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