MELSEC-QnA Serial Communication Modules Discontinuation Notice

This technical bulletin announces the discontinuation of the MELSEC-QnA series serial communication modules A1SJ71QC24N and A1SJ71QC24N-R2, with production ending June 30, 2006, due to obsolete parts and the release of compatible replacement models. It details the discontinuation schedule, repair acceptance through June 2013, and provides specific precautions for replacing the discontinued models with the alternative models A1SJ71QC24N1 and A1SJ71QC24N1-R2, including adjustments for communication timing, EEPROM write time, and internal current consumption.