Mitsubishi Electric A1SJ71UC24-R4 Communications Card

The Mitsubishi Electric A1SJ71UC24-R4 Communications Card provides reliable serial computer-link communication for Mitsubishi MELSEC A Series PLCs, enabling data exchange and remote monitoring across industrial networks. This rack‑mounted PLC communication module is commonly installed in automation systems, control panels, and manufacturing equipment that require serial interfaces, and it supports Mitsubishi computer link protocol with model‑dependent interfaces of RS‑232, RS‑422, or RS‑485. Used by maintenance teams, OEMs, and system integrators for communication upgrades, system integration, and replacement of existing PLC interface modules, the A1SJ71UC24-R4 facilitates PLC‑to‑computer or PLC‑to‑device data transfer and monitoring across production lines, process control systems, and SCADA‑integrated setups. Key details include its designation as a PLC Communication Module / Computer Link Card in the MELSEC A Series, mounting as a PLC rack‑mounted module, and its focus on serial communication for monitoring and control within industrial automation environments. Compatible with Mitsubishi A Series PLCs, this card is positioned to support reliable data exchange and remote monitoring within existing control architectures. Common replacements to consider are the A1SJ71UC24-R2, QJ71C24N, and FX3U‑232‑BD modules.