Factories worldwide are accelerating Human-Machine Interface (HMI) retrofits to advance smart manufacturing, strengthen cybersecurity, and improve analytics and operator experience. Major industrial firms are replacing legacy interfaces with modular, edge-enabled systems that deliver faster integration of analytics and secure connectivity.
Background
The global HMI market is projected to expand from USD 7.25 billion in 2025 to USD 13.44 billion by 2031, representing a compound annual growth rate of 10.8% as manufacturers pursue automation and real-time data capabilities. Companies increasingly favor retrofitting existing assets over full replacements to extend equipment life and control capital expenditures. Rising cybersecurity threats are prompting the adoption of biometric authentication and threat detection features in HMI designs as plants transition from standalone systems to connected smart factories.
Details
A case study from Nedschroef Machinery highlights the ongoing retrofit trend. The company replaced outdated Pro-face HMIs with a web-based, multi-touch HMI using the WebIQ platform. The upgrade enabled remote access, enhanced usability, and paved the way for predictive maintenance and diagnostics. Post-retrofit, engineers now independently develop and maintain interfaces. Koen Heylen, Automation Engineer at Nedschroef, stated, "we are now able to develop and maintain our own future-ready, web-based HMIs."
HEITEC recently completed a three-year HMI and PLC retrofit project for Diehl Aerospace. The project entailed a complete electrical redesign, integration of protocols including ProfiNet, Profibus-DP, RS232, and OPC UA, and compliance with EN 61010-1 safety standards. The outcome included improved performance, enhanced data capture, and extended machine life cycles with minimized environmental impact.
Analytics, Cybersecurity and ROI Drivers
AI-enabled HMIs are evolving into proactive tools, supplying predictive analytics and recommending optimal machine settings alongside the broader adoption of Industry 4.0 technologies. The increase in cybersecurity threats has driven vendors to implement secure boot features and encrypted communications in HMI hardware.
Case studies report strong returns on investment: retrofits generally incur lower costs than full system replacements, accelerate time-to-value, and improve operator efficiency through intuitive interfaces and advanced diagnostics. Remote monitoring further reduces downtime and provides modular options for system evolution.
Outlook
As manufacturers deepen Industry 4.0 adoption, HMI retrofits are set to remain a strategic focus for balancing cost, operational efficiency, and cybersecurity. Edge-based analytics and robust security features are expected to play an expanding role in retrofit projects over the next decade.
