ENHANCING AHU PERFORMANCE WITH PLC-BASED CONTROL SYSTEMS
                     ENHANCING AHU PERFORMANCE 
WITH PLC-BASED CONTROL SYSTEMS
www.messungautomation.co.in 
Imagine a world where your building breathes in oxygen. Where comfort meets air 
quality, and energy is saved. It is the world where AHUs and PLC control systems are the 
starting point of everything in the domain of Energy management systems.
These AHU controllers (Air Handling Units) are the lungs. But to make those lungs 
breathe better, smarter, and cleaner, you need a brain—enter the 
Programmable Logic Controllers (PLC).
We at Messung Industrial Automation are not just manufacturing PLC automation 
systems. We engineer intelligence. Smart PLC control is our ambition, and we aim to 
revolutionize the way AHU controllers operate, using a range of technologies including 
Modbus, MQTT, compact PLCs, or IOT-enabled PLC.
www.messungautomation.co.in 
What is a PLC-Based AHU Control 
System?
A PLC-based AHU control system is the 
HVAC
master conductor. The flow, cooling, 
heating,
and energy consumption of air are all 
controlled by real-time logic and 
precision through automation controllers.
Decision-making is the primary 
responsibility
of an IoT-enabled PLC. Your AHU is 
designed
to respond to data, adjust to changing
surroundings, and function like a finely 
tuned
machine. Whether it’s a mini PLC or a 
modular
wwPwL.Cm efsosru mngualuttio-zmoanteio nb.ucoil.dini ngs, this 
IEC 61131-3standard controller is the 
heartbeat of
your air management system.
Core Functions of PLC Automation in AHU Controllers
• Sensor Integration
Temperature, humidity, CO2, and pressure sensors are interpreted by PLC systems to manage 
energy efficiently.
Our intelligent PLCs capture every detail of your indoor environment.
• Data Analysis & Decision Making
Our IEC 61131-based PLCs analyze inputs like room occupancy, air quality,
and return temperature to take intelligent action.
• Control Actions via Actuators
Using PLC and Modbus TCP/IP, your controllers regulate VFDs for fan speed and energy savings.
• Actuated Dampers
Our compact PLCs give precise timing for zoned cooling, ensuring accurate damper operations.
• Valves
The PLC automation system manages hot and chilled water with accuracy for thermal comfort.
• Humidifiers & Dehumidifiers
Our controllers maintain optimal humidity levels regardless of weather.
www.messungsmart.com 
System Architecture Overview: The NX-ERA JET Advantage
NX-ERA JET PLC is an 
intelligent,
IEC 61131-3 standard system
Combining advanced logic,
seamless connectivity, and
scalability. It ensures sensors
And actuators function
in harmony.
www.messungautomation.co.in 
Features at a Glance:
• Modular PLC architecture scales with infrastructure.
• TCP/IP ensures fast, secure communication across systems.
• Native support for MODBUS RTU, Modbus TCP, MQTT for BMS, SCADA, IoT platforms.
• Integrated HMI enables real-time monitoring and diagnostics.
NX-ERA JET delivers the intelligence and flexibility needed for hospitals,
pharma cleanrooms, and smart malls.
www.messungautomation.co.in 
Benefits of IoT-enabled PLC for AHUs
•  Improved Energy Efficiency 
   IoT-enabled PLCs optimize fan speeds, valves, and dampers, saving up to 30% energy.
•  High Precision Control 
   IEC 61131-3 PLCs provide precise airflow, temperature, and humidity regulation.
•  Advanced Diagnostics 
   Real-time monitoring and predictive insights minimize downtime.
•  Scalability and Modularity 
   Modular PLCs adapt to expansion and upgrades without complexity.
•  BMS Integration 
   Our systems integrate HVAC, lighting, and fire alarms into a single ecosystem.
In a data-driven world, PLC-controlled AHUs offer more than
automation-they offer confidence.
www.messungautomation.co.in 
Intelligent PLC Systems for Smart Buildings
•  HMI with PLC Controllers
   Monitor fan speed and filter life easily from one interface.
•  MQTT-based PLC and IoT Systems
   Enable cloud communication and predictive control with ease.
Real-World Applications
•  Pharma Cleanrooms
   Maintain sterile zones by controlling temperature, humidity, and pressure.
•  Commercial Buildings
  Enhance employee comfort and productivity through climate control.
•  Data Centers
   Ensure cooling stability to prevent data loss.
•  Energy-Efficient Manufacturing
  Maximize AHU performance while minimizing emissions and energy use.
Wherever air needs managing, our Compact PLCs lead with intelligent control.
www.messungautomation.co.in 
Messung’s Expertise in HVAC Automation
We design smart automation systems, backed
by four decades of engineering excellence.
Architects, MEP consultants, and facility
managers across India and beyond trust our PLCs.
•  Built on IEC 61131-3 Standard
   Ensures global compatibility and consistency.
•  Built on IEC 61131-3 Standard
   Ensures global compatibility and consistency.
Our controllers don’t just automate industries
they bring them to life.
www.messungautomation.co.in 
Conclusion
Comfort, control, and conservation are non-negotiables in
today’s infrastructure. Messung’s PLC-based AHU systems
offer real-time responsiveness, BMS integration, and
energy efficiency with precision and reliability.
Don’t settle for basic—automate brilliance.
www.messungautomation.co.in 
THANK YOU.
Contact us
MESSUNG SYSTEMS PVT. LTD.
Office No.420, Tower -2,World Trade Center, Kharadi, Pune, India - 411 014.
T: +91 9561703619| E: [email protected]
www.messungautomation.co.in