By Eugene le Roux, FSAIRAC, and Eamonn Ryan
This is last part of a series first started on 29 and 30 September 2025.
Understanding the flow of information is every bit as important as understanding the flow of air, water, or refrigerant. Freepik.com
At the centre of every automation system lies the microprocessor. This is the brain that performs data processing within the Central Processing Unit (CPU). However, a practical control system needs more than raw processing power. It must also store information, handle input and output communication, and operate reliably in real-time.
When all of these functions – processor, memory and I/O interfaces – are integrated into a single device, we refer to it as a microcontroller. These compact, purpose-built devices are found in almost every piece of modern equipment, from air-conditioning systems and industrial refrigeration plants to vehicles and manufacturing machinery.
Communication between microcontrollers takes place via a bus: a set of electrical pathways that transfer data and control signals. One of the best-known examples is the Controller Area Network, or CAN Bus. Originally developed for automotive systems, CAN Bus has become a standard method for allowing multiple controllers to communicate efficiently over a shared network with minimal wiring.
Such technologies have made it possible to design distributed control systems where each component is intelligent and networked. Rather than relying on a single central processor, today’s systems often consist of many local controllers working together, sharing data and co-ordinating their actions. This approach increases reliability, scalability and speed of response.
Two questions naturally arise from this trend:
- Is this technology becoming so widespread that you need to be familiar with it? The answer is unquestionably yes. Whether you work in engineering, project management or operations, an understanding of how systems communicate and integrate is becoming essential.
- Should project managers or clients understand mechatronics? Again, yes. Mechatronics – the blending of mechanical, electrical and digital control – is no longer a specialist niche; it is the foundation of modern engineering. Being conversant in its basic principles helps you participate meaningfully in design meetings, evaluate proposals, and anticipate challenges in system integration.
Centralised control, distributed intelligence, digital communication: these are not abstract technicalities. They define how facilities operate today. As mechanical and electrical systems continue to converge with information technology, the ability to bridge those disciplines will set successful projects apart.
So, as we continue to explore the evolution of control systems, remember that understanding the flow of information is every bit as important as understanding the flow of air, water, or refrigerant. The future of engineering belongs to those who can see, and control, both.
