Reliance 57C413B 64K Common Memory Module

The Reliance 57C413B 64K Common Memory Module is a 64K x 16-bit memory module used in AutoMax and DCS 5000 racks to store shared configuration data. When placed in slot 0 in a rack with multiple Processor Modules, it provides 128K bytes (64K registers) of memory for cross-processor configuration data. The stored data includes definitions of physical I/O and other system-wide configurations that multiple processors must access, ensuring consistent operation across the rack. It is commonly cataloged as M/N 57C413B with alternative part numbers including 57C-413B, 57C413-B, and 804112-R, reflecting the Reliance Electric lineage that fed into Rockwell Automation. These modules are used to extend a processor's storage data in AutoMax racks, enabling larger configurations without modifying individual processors. The 57C413B is compatible with legacy Reliance Electric/Reliance automation systems and is typically employed in multi-processor AutoMax configurations where centralized memory holds the pilot parameters, I/O maps, and inter-processor definitions.