PLC-Based Automation Systems Explained
31 Dec 2025
A practical guide to PLC-based automation systems, architecture, programming standards, and real-world use cases.
Programmable Logic Controllers (PLCs) are the backbone of industrial automation systems.
They are designed to operate reliably in harsh industrial environments and control machines and processes
through digital and analog I/O.
PLC programming is standardized under IEC 61131-3, which defines languages such as Ladder Logic,
Function Block Diagram, Structured Text, and Sequential Function Charts.
Popular PLC platforms include Siemens SIMATIC S7, Allen-Bradley ControlLogix, Mitsubishi MELSEC,
and Schneider Electric Modicon.
PLCs are commonly integrated with HMIs, servo drives, safety relays, and industrial networks
such as PROFINET, EtherNet/IP, and Modbus.