PLC/PAC and Controllers
How does a programmable logic controller (PLC/PAC controllers) work?
A programmable logic controller or a PLC/PAC controller usually comprise three integral components, i.e., power supply, processor, and an input/output (I/O) section. In simple terms, the processor is referred to as the brain of the PLC/PAC as it is designed to perform multiple tasks related to machine tool, process-control functions, and production. A user can successfully operate PLC/PAC controllers by monitoring the current status of the inputs, executing the control program, and timely updating the status of the outputs.
To go beyond these capabilities, some ranges of PLC/PAC’s systems also offer high availability, ensuring continuous operations and minimizing downtime in critical industrial operations. They have built-in cybersecurity features safeguarding your automation system. Additionally, with their communication cards, PLC/PAC systems can integrate with various industrial networks and devices, enabling robust and secure data exchange.
Furthermore, the PLC/PAC’s cutting-edge design allows them to withstand harsh environments, ensuring reliable performance even under extreme circumstances. They also empower the user to operate through a wide range of applications, from simple control tasks to complex processes automation.
Need help choosing PLC/PAC and Controllers?
Our portfolio supports:
- Scalable Architecture: From entry-level controllers for simple tasks to powerful CPUs for demanding applications, Modicon PLCs grow with your system requirements. The Modicon range also supports from multi-axis motion control to high-availability redundant processes.
- Optimized Machine Performance: Achieve greater efficiency and responsiveness in your processes with robust control capabilities.
- Flexible Integration: Seamlessly connect across various industrial environments using a wide array of supported communication protocols.
- IIoT-Native Edge Control: Modicon edge controllers manage complex interfaces across assets and devices, or directly into the cloud. With embedded safety and cybersecurity, they enable secure, real-time data exchange and control for IIoT applications.
- EcoStruxure Compatibility: Fully integrated into our EcoStruxure™ platform, enabling seamless engineering, monitoring, and maintenance across the entire lifecycle.
Modicon M251 Micro PLC with Dual Channel Comm
Modicon M241 Micro PLC

Modicon PLC Configurator
Selecting the right PLC and IOs has never been so easy and fast. Save time during design and implementation into your project.
Modicon M221 Nano PLC
Modicon M258 Compact PLC for Machine Automation
Ensure the longevity of your plant with Modicon PAC controllers. Our comprehensive range of controllers offers advanced features and scalable performance to automate processes of any size. Modicon PACs provide redundancy capabilities, functional safety, native Ethernet, embedded cybersecurity, and common programming software shared across all PAC controllers.
Modicon M340 PAC
Modicon MC80
EcoStruxure Control Expert Software
Modicon M171/M172 Logic Controller
Modicon Edge I/O NTS
Modicon Edge I/O NTS is a robust IP20 distributed I/O system with a wide choice of modules. Edge I/O NTS is integrated in EcoStruxure Machine, Control and Automation Expert. It works with a large variety of PLCs as Modicon M241, M251, M262, M660, M340, M580, SoftdPAC, PacDrive and third-party PLC over Modbus TCP or EtherNet/IP. Modules and features presented will be deployed during 2025. For feature availability, check Release Notes.
Modicon TM3 Expansion I/O modules for M221, M241, M251
Modicon TM5 IP20 Modular I/O System