Soft PLCs (Software-based Programmable Logic Controllers) execute traditional control logic on standard, commercially available computing hardware — industrial PCs, edge gateways, or servers — instead of proprietary embedded hardware. The defining promise is hardware independence: the ability to decouple control software from any single vendor's physical platform, running IEC 61131-3 logic portably across different devices.
The Evolving Landscape in 2026
The industrial automation market is undergoing a structural transition from traditional hard PLCs toward software-defined architectures. The global PLC market is projected to grow from USD 12.79 billion in 2025 to USD 16.4 billion by 2031, driven significantly by the push for software-defined and virtual PLC architectures that separate control software from proprietary hardware limitations. The U.S. PLC software market specifically is forecast to grow from USD 10.2 billion in 2024 to USD 18+ billion, fueled by smart manufacturing and Industry 4.0 initiatives.
Soft PLC vs. Virtual PLC: A Critical Distinction
A major development reshaping the field is the emerging split between Soft PLCs and Virtual PLCs (vPLCs):
According to a March 2026 Omdia analyst report, soft PLCs "have stagnated" in their promise to deliver hardware independence, while virtual PLCs — with their hardware-agnostic, scalable, and resilient architecture — are positioned to disrupt the market, with soft PLCs surviving mainly in niche, motion-critical applications.
Containerization: The Biggest Driver of Hardware Independence
The most transformative technical trend right now is the containerization of Soft PLCs. When PLC logic is packaged as a container (e.g., Docker), it becomes a fully portable software artifact that can be deployed, versioned, and rolled back across any compliant hardware — eliminating lifecycle dependency on physical PLC hardware. Key operational benefits include:
Fleet-wide deployment of control logic across multiple production lines without on-site hardware changes
Co-location of PLC workloads alongside edge AI and IoT applications on a single edge device, reducing hardware sprawl
Standardized CI/CD-style operations — health checks, logging, and monitoring applied uniformly across sites
Containerized open process automation projects now support logic reassignment between controllers without rewiring or hardware recertification
CODESYS: The Leading Hardware-Independence Platform
CODESYS remains the most prominent open platform enabling hardware independence in 2026. By running CODESYS SoftPLC on any industrial PC, engineers break vendor lock-in entirely — purchasing any brand or spec of IPC on the open market rather than being forced into a single vendor's ecosystem. A single CODESYS IPC can consolidate:
PLC logic (IEC 61131-3 programs)
HMI/WebVisu visualization
Motion/CNC control
OPC UA, EtherCAT, PROFINET, MQTT communications — without add-on communication cards
CODESYS recently highlighted enabling TUM BORING's tunneling project to achieve "maximum independence from device manufacturers" as a showcase of its platform's hardware-agnostic capabilities.
Open-Source and Open Automation Initiatives
The open-source industrial automation movement is accelerating hardware independence further. Platforms like Autonomy OpenPLC and KPA Automation SoftPLC provide completely hardware-independent control platforms, democratizing access beyond traditional vendor ecosystems. The Open Process Automation (OPA) initiative, covered by Control Engineering in March 2026, emphasizes containerized designs for quick deployment with hardware independence, where logic can be dynamically reassigned to other controllers as operational needs change.
Key Industry Standards Driving Adoption
Two standards are central to hardware-independence in modern Soft PLC deployments:
IEC 61131-3 — The universal programming language standard (Ladder, Structured Text, Function Block Diagram, etc.) ensuring portability of control logic across hardware
IEC 61499 — An emerging standard enabling event-driven, distributed function blocks specifically designed for hardware-agnostic, scalable automation; now referenced in market transitions toward virtual architectures
Cybersecurity & Compliance Challenges
Hardware independence introduces new attack surfaces. As Soft PLC logic migrates from isolated embedded hardware to shared computing environments and networks, PLC software providers face increasing pressure around cybersecurity standards and regulatory compliance. Organizations adopting containerized or virtual PLCs must address:
Secure container orchestration and image integrity
Network segmentation between IT and OT environments
Compliance with IEC 62443 industrial cybersecurity frameworks
Market Outlook
The trajectory is clear: hardware independence is no longer a differentiator for Soft PLCs — it is becoming the baseline expectation. Virtual PLCs are raising the bar to full cloud/server-hosted, centrally managed architectures. For engineers in industrial automation and construction management environments, this means the value now lies in platform openness (CODESYS, OPC UA), containerization readiness, and IT/OT convergence capability rather than simply "runs on a PC."
About the Author
Nay Linn Aung is a Senior Automation & Robotics Engineer (M.S. Computer Science — Data Science & AI) specializing in the convergence of OT and IT.