A1SD51S Intelligent Communication Module Discontinuation Notice

This technical bulletin announces the discontinuation of the Mitsubishi MELSEC-AnS series A1SD51S intelligent communication module, with final orders accepted through May 2010 and production ending June 2010 due to obsolete parts. It provides alternative replacement models (QD51 or QD51-R24) requiring transition to a MELSEC-Q series system, along with repair acceptance until June 2017 and detailed replacement procedures including BASIC program modifications and switch settings.