Mitsubishi Electric A1SJ71AP21 Datalink Module

The Mitsubishi Electric A1SJ71AP21 Datalink Module is a rack-mounted MELSEC-A Series PLC-to-PLC data link device that enables high-speed data exchange between PLCs and networked devices in industrial automation. It is powered through the hosting PLC base unit via a dedicated communication port, delivering stable, synchronized data transmission across manufacturing lines, process control, and distributed control networks. Compatible with Mitsubishi MELSEC-A Series PLC systems, its manufacturer part number is A1SJ71AP21, with common replacements including QJ71E71-100, AJ71AP21, and QJ71LP21-25. Use it for system expansion, retrofit, or replacement of PLC communication modules to support industrial network communication and data sharing.