Reliance Electric 57413-3E Common Memory 64K Module

Reliance Electric 57413-3E Common Memory Module is a 128K-byte, 16-bit common memory board built around the 57C413B design, intended for Reliance AutoMax and DCS 5000 racks. It is installed in slot 0 when the rack contains more than one Processor module, and it stores configuration data that must be shared among processors, such as definitions of physical I/O, ensuring consistent startup and operation across all processors in the rack. The module provides 64K memory registers (128K bytes total), enabling a substantial space to hold processor coordination data and I/O mappings. To preserve memory contents during power loss, the 57413-3E requires an external battery backup. This Common Memory Module occupies a specific role in multi-processor configurations by maintaining a central, shared memory image that processors reference during operation, minimizing mismatches and simplifying system initialization, and is compatible with 57C413B-based configurations used in AutoMax and DCS 5000 systems.