Protocol
OPC UA
OPC Unified Architecture
Platform-independent industrial information model with secure channels, sessions, subscriptions, and monitored items. Binary UA-TCP and HTTPS transports are common; PubSub adds cyclic datagram distribution. Companion specs define domain models from robotics to machine vision.
Domains
Layers
Tags
information-modelpubsubscadasecure
Sources
- OPC UA specifications (OPC Foundation)
Related protocols
PROFINET
Lab readyIndustrial Ethernet from PROFIBUS International with Real-Time (RT) and Isochronous Real-Time (IRT) classes for cyclic IO. Device descrip…
Modbus TCP
Lab readyModbus application PDUs carried over TCP port 502 with an MBAP header instead of serial address and CRC. Function codes and register maps…
MQTT
Lab readyPublish/subscribe messaging over TCP with QoS 0/1/2 delivery grades. Topics, retain flags, and last-will messages are core broker feature…