OT/IT names the two technology worlds of an industrial company: OT (Operational Technology) covers systems that control physical processes, such as PLCs, SCADA and sensors, and IT (Information Technology) covers management systems: ERP, databases, analytics. Their convergence is the foundation of industrial digitalisation.
What OT means in a company
In a company, OT is all the technology that moves, measures and controls production: what sits on the plant floor rather than in the office. If a device acts on a machine, a line, a furnace or a valve, or reads a physical variable, it is OT.
In a typical factory that includes controllers and their programs, HMI panels, the supervisory SCADA, drives, robots, sensors and field instrumentation, and the industrial networks that tie them together. It usually belongs to maintenance, engineering or production rather than the IT department, and it mixes equipment from different decades that keeps running because replacing it would mean stopping the line.
OT vs IT
The difference between OT and IT, in short:
- What it governs. OT, physical processes: machines, energy, materials. IT, information: orders, invoices, inventory, analytics.
- Priority. OT, availability and process safety. IT, confidentiality and integrity of information.
- Lifecycle. OT, equipment kept in service for decades. IT, systems renewed on much shorter cycles.
- Protocols. OT, industrial protocols such as Modbus, PROFINET or OPC-UA. IT, general-purpose network and application protocols.
- Owner. OT, maintenance, engineering and production. IT, the IT department.
Why OT and IT converge
OT prioritises availability and process safety; IT prioritises information confidentiality and integrity. They grew apart, with different protocols, lifecycles and owners, which is why production data often reaches management late and by hand. OT/IT convergence builds the bridge: standard protocols such as OPC-UA and MQTT, edge gateways and a unified data layer.
For an SME the effects are concrete: manual transcription and its errors disappear, problems become visible while they happen, and the unified data layer becomes the foundation for OEE, traceability and predictive maintenance. All of this connects existing systems rather than replacing them. See OT/IT integration.