blog about Opensource PLC Software Gains Traction for Industrial Automation

In industrial automation, programmable logic controllers (PLCs) serve as the central nervous system, precisely orchestrating complex production processes. However, the high licensing costs of traditional PLC software impose a significant financial burden on businesses, particularly small and medium-sized enterprises. Fortunately, the emergence of open-source PLC software offers a cost-effective alternative. This article explores leading open-source PLC solutions, with a focus on Mect Suite , a robust offering from Italy’s industrial automation leader, Mect.

Imagine building a powerful automation control system without hefty software licensing fees—a notion once deemed unrealistic. Open-source PLC software dismantles this barrier, delivering tangible advantages:

• Reduced Costs: Eliminates expensive licensing fees, slashing project budgets.
• Flexibility and Customization: Open code allows tailored modifications for specific applications.
• Community Support: Vibrant developer communities provide troubleshooting, updates, and extensions.
• Vendor Neutrality: Avoids lock-in to proprietary systems, ensuring long-term autonomy.

Developed under free-software principles, Mect Suite is a unified environment for creating human-machine interfaces (HMIs) and PLC applications. Its SDK comprises two core tools:

• Qt Creator: Enables drag-and-drop HMI design with ATCM plugins, linking graphics to PLC variables without advanced coding.
• ATCMcontrol Engineering: Supports all five IEC 61131-3 programming languages (ST, FBD, SFC, LD, IL) for complex logic.

Key Features:

• Real-time HMI/PLC synchronization
• Online debugging and remote control via VNC
• NTP synchronization, data logging, and trend analysis
• Modbus RTU/TCP and CANopen protocol support
• Wi-Fi and mobile device integration

Ideal for: Compact systems, Mect hardware integration, and remote management.

Compliant with IEC 61131-3, OpenPLC supports ladder logic and functional block diagrams. Its cross-platform compatibility and active community make it suitable for residential and industrial projects.

Highlights: Full open-source access, Modbus/Ethernet/IP support, and Raspberry Pi compatibility.

While not fully free, CoDeSys offers a robust evaluation version. Its extensive library support and multi-platform adaptability cater to large-scale projects.

This free tool simulates PLC behavior, enabling logic validation without physical hardware—ideal for education and prototyping.

A straightforward simulator for mastering ladder diagrams, LogiSim is tailored for newcomers to PLC programming.

Designed for HVAC and energy systems, BACnet ensures interoperability across devices in smart buildings.

For enterprises prioritizing seamless integration and remote capabilities, Mect Suite delivers a comprehensive, open-source solution. Its synergy with Mect hardware and sMily remote tools streamlines automation workflows without compromising performance or budget.