What is OPC UA and why is it used in industrial robotics integration?

• A. Modbus RTU
• B. CAN bus
• C. OPC UA
• D. I2C

Answer: (C)

OPC UA is a platform-neutral framework for industrial data exchange that gives robots and control systems a common, semantically rich language to share information. It separates the data model from the transport, so devices and software from different vendors can describe their state, capabilities, and events in a consistent way and communicate securely. In robotics integration this means a robot controller, PLC, motion planner, and higher-level systems like SCADA or MES can query, subscribe to, or publish data using the same semantics, access historical values, and respond to events, all with robust security and reliability. OPC UA supports standardized information models, method calls, events, and subscriptions, plus authentication and encryption, making it suitable for scalable, enterprise-grade automation. The other options are lower-level fieldbus or inter-device protocols that carry simple data with limited semantics and security, and they don’t provide the cross-vendor interoperability or rich information modeling needed to integrate diverse robotics and automation systems.