Industrial Engineer · phase 5 of 16 · noun

OPC UA

Platform-independent industrial communication standard for structured, secure data exchange between systems.

The Explain card

Plain English: OPC UA is a vendor neutral standard for moving structured data between industrial systems, with security built in. A server publishes its data as a browsable tree and clients read, write and subscribe.
Example: A PLC runs an OPC UA server. The MES, a historian and a dashboard all connect as clients and see the same tag names, types and units, without a driver written for that PLC.
Why it matters: It is how the controller layer talks to the IT layer without a custom protocol per brand. Certificates and encryption are part of it, which is the main reason it replaced the older OPC that depended on Windows networking.
Hook: The factory floor, published for the building upstairs.

How the word is built, where it came from, and what it sits beside in memory.

In a sentence

The SCADA server uses OPC UA to read motor speed, current, and fault status from the packaging-line VFD.

Why these words

OPC 1990s English initialism of OLE for Process Control preserves the established OPC family name
UA English initialism of Unified Architecture identifies the unified generation of the OPC specifications

Where it came from

Origin: Industry coinage combining OPC, originally OLE for Process Control, with UA, Unified Architecture
Entered the language: 2000s
What changed: OPC began as a Windows-based specification name, then became the retained family name when Unified Architecture replaced the earlier technology base.

How it is spelled

Pattern: Both components are written in capital letters
Pattern: The two initialisms are separated by a space and normally take no periods

Spelled like

Broken into chunks

What it sits beside

Same subject

Same shape

OPC technology generations

OPC UA communication models

Phase 5: PLC Industrial Communications

The protocols that let controllers, drives and operator panels talk, plus the addressing and description files that make them agree on what was said.