Siemens 6ES5910-0AA31 EPROM Memory Card Module

Siemens 6ES5910-0AA31 memory submodule (EPROM) is a SIMATIC S5 accessory engineered for use with the S5-110A programmable logic controller, delivering dedicated program storage on a compact EPROM module that interfaces with the S5 backplane and supports the S5 family’s traditional CPU architecture. Known in Siemens catalogs as memory submodule 910 for the S5-110A, it accommodates up to 2044 instructions, enabling the storage of the PLC’s control logic in non-volatile memory that persists through power cycles and simplifies program transfer between units. In typical installations, the 6ES5910-0AA31 is housed in the S5-110A CPU assembly to preserve the active program, and technicians often swap this EPROM during maintenance to recover or restore a known good configuration on aging equipment. Common applications include maintenance and repair of legacy Siemens automation, retrofits of older production lines, archival storage of the S5-110A program for change management, disaster recovery, and provenance documentation when replacing or refurbishing a PLC system.