Process control systems are devices that respond to inputs from a process and related equipment, other programmable systems, and operators. They then generate output signals, causing the process and related equipment to work as desired and within preset production constraints.
Think of the systems as quality testers scattered throughout the production line who ensure each product meets the required specifications before it leaves each step in the entire production process.
Read More about Process Control Systems
Before diving into the systems that make process control possible, let’s tackle what the concept is first.
What Is Process Control and How Does It Work?
Process control aids in continuous production in fields like manufacturing that require some kind of material production without any kind of interruption. It’s also applied in batch processing to control production conditions to ensure better quality and efficiency automatically.
The concept involves three basic operations—measurement, decision, and action.
First, sensors and transmitters measure the controlled variables (i.e., product dimensions). Next, the controllers decide what to do with the variables based on the measurements and the desired set points (i.e., exact specifications). Finally, the entire system acts according to the decisions made by the controllers to create the products.
What Are the Different Types of Process Control Systems ?
There are two broad types of process control systems. Learn more about each below.
Discrete Process Control Systems
Discrete systems are often simple since they handle processes like regulating the temperature in a building. They allow direct manipulation by a person. That means someone can shut the system down manually for maintenance or other reasons.
These systems are often engaged in small-scale production where manufacturers can spare resources so someone can watch the system. They were initially pneumatic or operated by pressure, but many have transitioned to being fully electronic.
Distributed Process Control Systems
Distributed systems are typically more complex. Instead of monitoring a single or relatively few processes, they often watch out for a complex system. They can track multiple types of control devices so they can oversee an entire production facility.
These systems automate processes and have other systems built into them to shut down a process if it exceeds safety parameters or other metrics. They can also communicate with other systems in different sections of a production facility.
What Benefits Do Process Control Systems Provide?
Using the systems offers businesses various benefits, including:
- Provide energy savings since they reduce wastage by making plants and machinery more efficient
- Improve safety because they automatically warn of any abnormality that minimizes the risk of accidents
- Ensure consistent product quality by keeping variations to a minimum, thus also reducing wastage
- Lower manufacturing costs since they can detect faults early, thus maintaining quality
- Improve environmental performance because they can give early warnings when emissions rise
- Increases employee productivity since they automate manual tasks, allowing them to focus on more critical aspects of their job like quality assurance
What Kinds of Industries Utilize Process Control Systems ?
Various industries use the systems for different production needs. Here are a few of them.
Chemical Industry
The systems enhance safety, optimize production, and minimize waste in chemical processes that involve complex reactions requiring precise control.
Energy Sector
Regardless of power plant type—conventional or renewable—the energy sector benefits from advanced control systems that maximize efficiency, manage load distribution, and ensure grid stability.
Automotive Manufacturing Industry
This industry relies on the systems to automate assembly lines. As such, they ensure consistent quality and high production efficiency.
Oil and Gas Sector
Exploration, drilling, refining, and transporting oil and gas require intricate processes that demand precise control for safety, efficiency, and environmental compliance, making the systems critical to the sector.
Pharmaceutical Industry
Manufacturing pharmaceuticals need stringent quality control. That makes the systems indispensable to the industry for ensuring product consistency and meeting regulatory standards.
Water Treatment and Utilities Sector
The systems monitor and regulate the distribution of clean water and the treatment of wastewater in water treatment plants and utilities.
Food and Beverage Industry
This industry requires systems to process and package raw materials while maintaining their quality, safety, and compliance with hygiene standards.
Industrial Sector
The systems monitor, control, and optimize the functionality of industrial control systems (ICSs) through what’s called “industrial process control (IPC)” using control algorithms.
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While the concept of process control has been around for centuries, dating back to the Industrial Revolution, it has dramatically improved with the help of technology.
Key Takeaways
- Process control systems respond to inputs from processes and related equipment, other programmable systems, and operators to generate output signals within preset production constraints.
- Process control aids in continuous production that requires some kind of material production without any kind of interruption. It involves three basic operations—measurement, decision, and action.
- The systems can be broadly categorized into discrete and distributed systems.
- The chemical, energy, and automotive manufacturing sectors, apart from several others, greatly benefit from using the systems.
Sources
- https://www.sciencedirect.com/topics/chemical-engineering/process-control-system
- https://www.liveabout.com/process-control-systems-pcs-2221184
- https://www.sciencedirect.com/topics/engineering/process-control-system
