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Process Automation: What It Is, and How It Differs from Discrete Automation
Process automation uses control systems to run continuous or batch processes, chemicals, food, energy, where the product is a flow, not a countable part. It differs from discrete automation, which handles individual items like assembled products. One controls temperatures, flows and reactions; the other controls pick, place and assemble.
Why is process automation important?
Process automation matters because continuous and batch processes move too fast, and too precisely, for manual control to hold safely. Automated control loops keep temperature, pressure and flow inside their limits, which prevents off-spec product, waste and safety incidents. It also captures the data needed for quality, traceability and compliance that a manual log cannot.
What does process automation control?
It keeps a continuous or batch process inside its limits, automatically:
- Continuous variables: temperature, pressure, flow, level.
- Recipes and batch sequences, with parameters enforced.
- Control loops that hold a setpoint without a human at the dial.
- Alarms and interlocks that act before a limit is breached.
- Data capture for quality, traceability and compliance.
How does it differ from discrete automation?
The nature of the product. Process automation handles flows, liquids, gases, powders, controlled by variables and recipes, often feeding a recipe management system. Discrete automation handles countable items, robots assembling parts, controlled by steps and positions. It’s part of the wider move toward a paperless factory and Industry 5.0.
Process vs discrete automation at a glance
Flows versus countable parts.
| Aspect | Process Automation | Discrete Automation |
|---|---|---|
| Product | A flow (liquid, gas, powder) | Countable items |
| Controls | Temperature, flow, recipes | Position, sequence, assembly |
| Industries | Chemicals, food, energy | Automotive, electronics |
| Runs on | Control loops and recipes | Steps and motion |
Related Terms
- Manufacturing Execution System (MES) – sits above the controls.
- Process Control Systems
- Remote Terminal Unit (RTU)
