01Why OPC-UA over Modbus
Modbus moves registers; OPC-UA moves structured, typed, secured information with a self-describing model. When both ends support it, UA gives you encryption, authentication and a model that MES/SCADA understand without a custom register map.
02On a Pi
Open stacks like open62541 (C) and asyncua (Python) run well on a Pi, so it can publish its sensor and AI results as a secure UA server, or pull from UA-capable PLCs. It bridges naturally: Modbus on the field side, OPC-UA up to the enterprise.
Common questions
The ones we're asked on every first call.
Yes, when configured properly — UA's security profiles give you encryption and certificate-based auth. Combined with a hardened, signed Pi image and network segmentation, it's a defensible OT endpoint.
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