Bridging OT and IT: protocol translation at the edge
By Educraftech
Factories speak Modbus, PROFINET, and CAN. Enterprises speak MQTT, REST, and SQL. The edge gateway that translates between them is routinely underestimated — treated as a script, when it is actually the most operationally exposed component in the plant.
Semantics, not syntax, is the hard part
Mapping a holding register to a JSON field is trivial. Deciding that register 40012 is "line 3 outfeed temperature in °C, valid only while the machine state register reads RUNNING" is the real work. A translation layer without a data model just moves ambiguity upstream.
Design for the network you actually have
Plant networks partition, cellular backhaul drops, and brokers restart. The gateway needs store-and-forward buffering, idempotent publishing, and clocks it can trust — otherwise the historian fills with duplicates and gaps that no dashboard can explain.
Security is a boundary, so treat it like one
The OT side often cannot be patched; the IT side must assume it is hostile. One-way data flow by default, allow-listed writes with audit logs when control is unavoidable, and certificates managed like production secrets. The gateway is where those two worlds meet — it should be the most boring, most monitored box on the network.