PLC Scan Cycle Explained – How PLC Thinks & Works
Welcome to Instrumentation & Automation by Nasar Babu!
In this video, we dive deep into the PLC Scan Cycle – the core of how a PLC works. Learn how inputs, logic, and outputs are processed step by step, and why PLCs do not respond instantly. This is a must-watch for anyone learning industrial automation or preparing for PLC interviews.
You’ll discover:
Input Scan – How the PLC reads digital and analog signals from field devices
Program Scan – How logic is executed inside the PLC CPU
Output Scan – How the PLC updates actuators and devices
Scan Time – How fast a PLC completes a cycle
Real-world examples – Push buttons, motors, solenoid valves, and more
By the end of this video, you will understand how PLCs process signals in milliseconds and why understanding the scan cycle is essential for troubleshooting and designing automation logic.
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