MELSEC-QnA Serial Communication Modules Discontinuation Notice

This technical bulletin announces the discontinuation of five MELSEC-QnA series serial communication modules (AJ71QC24, AJ71QC24-R2, AJ71QC24-R4, A1SJ71QC24, A1SJ71QC24-R2) due to obsolete parts and the availability of compatible replacement models. It provides the discontinuation schedule, repair acceptance period through December 2011, and details on alternative models, including precautions for program reuse and increased internal current consumption.