MELSEC Series Ethernet Module Cybersecurity Precautions

This technical bulletin outlines cybersecurity risks for MELSEC iQ-R, iQ-F, and Q/L/F series modules with Ethernet ports when directly connected to unprotected networks, including unauthorized access, denial-of-service attacks, and data tampering. It provides user measures such as checking network connections, implementing firewalls, and installing VPNs to secure communications.