Allen-Bradley 1775-MX Memory Communication Module

Allen-Bradley 1775-MX Memory Communication Module is an accessory for PLC-3 backup configurations that enables data-table transfers between the main processor memory and a backup memory module. When used with a 1775-CM memory communication cable, the 1775-MX supports memory-table transfers and data migration during maintenance or power-down events. Rockwell documentation notes that the 1775-MX quickly transfers data and is employed in PLC-3 backup concepts to preserve or replicate memory contents across processor banks. The module includes PASS and FAIL indicators to show transfer status and module health, helping technicians verify successful data synchronization. Common applications include maintaining memory consistency between the active PLC-3 processor and its backup, enabling data backups and quick recovery in PLC-3 backup systems.