FX1S to FX3S Programmable Controller Replacement Technical Bulletin

This technical bulletin provides guidance on replacing Mitsubishi Electric FX1S Series programmable controllers with the FX3S Series, including recommended substitute models for main units, expansion devices, and optional accessories. It highlights key specification differences such as larger program capacity in FX3S, different device assignments, and necessary adapters or wiring changes, while advising users to consult local representatives for application-specific suitability.