The Mitsubishi Electric A1SJ71AT21B Data Link Module extends your MELSEC A Series PLC with reliable controller-to-controller communications for demanding industrial automation networks. Designed for plant-wide data exchange, it enables fast, deterministic linking of process data across production cells, lines, and SCADA gateways while preserving the robustness required in harsh industrial environments.

Engineered for seamless rack integration, the module installs in A1S base units and communicates over the backplane with the CPU, supporting scalable network architectures and centralized diagnostics. Its data-link functionality streamlines inter-PLC messaging, reduces custom wiring, and simplifies maintenance, making it an efficient choice for upgrading legacy systems or adding capacity to existing Mitsubishi control platforms.

Whether deployed as part of a new installation or as a drop-in replacement within an existing MELSEC A cabinet, the A1SJ71AT21B helps standardize your PLC networking strategy for long-term reliability and serviceability, and it is supplied with a 1-year warranty for added peace of mind.

• Brand: Mitsubishi Electric
• Series: MELSEC A Series
• Model: A1SJ71AT21B
• Module type: Data link module
• Platform compatibility: A1S/A Series PLC base units
• Power supply: Backplane powered via base unit
• Protection rating: IP20
• Connection type: Rack backplane plus front network port(s)