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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →A process automation system combines sensors, control logic, equipment that changes the process, and interfaces that let people monitor it. Together, these elements measure and regulate an industrial process, from a local production line to geographically dispersed assets. Such systems can support continuous production or batch manufacturing.
What is a process automation system?
The International Society of Automation (ISA) defines process automation and control as encompassing “hardware, software, systems and methods that measure, regulate, manipulate and visualize industrial processes for optimum consistency, efficiency and safety.” In practical terms, a system observes conditions, decides how equipment should respond, applies that response, and presents operating information to people.
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NIST uses the broader term industrial control system (ICS) for information systems used to control industrial processes, including manufacturing, product handling, production, and distribution. ICS is an umbrella category that includes SCADA, DCS, and other configurations such as PLCs.
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How the components work together
A process automation system is a coordinated set of components, not just a controller or a piece of software. NIST notes that control components can include electrical, mechanical, hydraulic, and pneumatic elements working toward an industrial objective.
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- Measure: Sensors and instrumentation detect process conditions, such as a physical operating state or change.
- Control: A PLC, DCS, or other control device monitors the process and uses programmed logic or control methods, such as PID, to determine a response.
- Act: Final control elements, including valves and pumps, adjust the process in response to the control system.
- Supervise and visualize: Interfaces in a control room or at remote locations help operators view conditions and supervise operations. SCADA and RTU systems can support this supervisory role.
The exact arrangement depends on the process. These functions may be distributed across multiple devices and systems rather than housed in one unit.
What do PLC, DCS, and SCADA mean?
PLC, DCS, and SCADA describe related control-system configurations or functions within the wider ICS landscape. They are not a universal checklist of mutually exclusive products, and a plant may combine approaches.
| Term | Primary role or scope | How to understand it |
|---|---|---|
| PLC (programmable logic controller) | Industrial control hardware, including use in localized process control | A physical controller used to monitor or control equipment and processes. |
| DCS (distributed control system) | Monitoring, supervising, and manipulating processes | A control-system category used in process and manufacturing environments. |
| SCADA (supervisory control and data acquisition) | Gathering and processing data, then applying operational controls over long distances | Commonly associated with geographically dispersed assets; NIST gives power distribution and pipelines as typical uses. |
Choose terminology based on the system’s role and scope, not an assumed rule that every process must use one architecture. A localized process and a network of distant assets can have different control needs.
Which production processes use automation?
ISA distinguishes continuous processing, which uses raw materials and energy continuously to produce a product, from batch processing, where products are made in batches. The distinction describes how production proceeds; it does not by itself determine which control-system configuration is appropriate.
- Continuous processing: Examples include oil and gas, pulp and paper, chemicals, and power.
- Batch processing: Products are produced in batches rather than as a continuous stream.
ISA also identifies process safety, burner management, and fire and gas systems as process-automation application areas. Its broader examples of automation include manufacturing, utilities, transportation, defense, and facility operations; those categories should not all be treated as process industries.
How ISA-95 places automation in a manufacturing system
ISA-95, also known as ANSI/ISA-95 or IEC 62264, is a technology-agnostic set of standards for integrating logistics and manufacturing control systems. It describes levels by activity, from physical production to business planning. ISA says the framework primarily addresses the interface between manufacturing operations (Level 3) and business systems (Level 4).
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| Level | Activity | Examples |
|---|---|---|
| 0 | Physical production process | The process itself. |
| 1 | Sensing and manipulating the production process | Sensors, smart devices, and valves. |
| 2 | Monitoring and supervising control | PLCs and DCS. |
| 3 | Manufacturing operations management | MES and systems such as SCADA. |
| 4 | Business planning and logistics | ERP. |
The ISA page lists ANSI/ISA-95.00.01-2025 among current editions. Standards editions can change, so check the current ISA listing when edition-level currency matters.
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How to think about the right system scope
There is no single process automation system type that fits every installation. The useful questions are what the system must control, how widely assets are distributed, what kind of production is involved, and where the boundary lies between plant-floor control, manufacturing operations, and business planning.
- Geographic scope: Is control localized, or must operators supervise assets across long distances?
- Primary role: Is the priority measurement, direct manipulation, supervisory control, or visualization?
- Process mode: Is production continuous or batch-based?
- Integration boundary: Does the need end at equipment control, include manufacturing operations management, or extend to business planning and logistics?
ISA’s wider definition of automation is “the creation and application of technology to monitor and control the production and delivery of products and services.” Process automation applies that broad idea specifically to industrial processes.
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Sources and further reading
- NIST: Industrial control system (ICS) glossary
- ISA: Process Automation and Control
- ISA: ISA-95 Standard—Enterprise-Control System Integration
- ISA: What is Automation?
- NIST: SCADA glossary
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