Matute Villegas, M.C. et al. 2026. Biometric-Gated SD-VPN Gateway for Secure Remote PLC (Siemens S7-1200) Control with Microsegmentation and Conversational Monitoring. LACCEI. 1, 14 (July 2026). DOI:https://doi.org/10.18687/LACCEI2026.1.1.2572.