MELSEC-A A1SY42 I/O Module Discontinuation Notice

This technical bulletin announces the discontinuation of the Mitsubishi MELSEC-A series I/O module A1SY42, with final order acceptance through July 2004 and production ending in August 2004, while repair services remain available until August 2011. It provides a detailed specifications comparison between the discontinued A1SY42 and its upward-compatible replacement A1SY42P, including differences in maximum load current, inrush current, response time, fuse protection, error indication, and internal circuit diagrams.