Version numbers in industrial software are never arbitrary. was released during a specific lifecycle phase of the product. While Mitsubishi has since moved on to much higher version numbers (e.g., 1.100+, 1.110+, and now into the 1.1xx series with many patches), the "1.090U" designation points to a version that likely includes:

networks, enabling secure communication between safety-rated scanners and adapters directly within the engineering environment. Other Notable Updates Critical Security Patches