Siemens 6ES7952-1AY00-0AA0 SIMATIC S7-400 RAM Memory Card 64MB Long Design PLC Memory Card

The Siemens SIMATIC S7 RAM memory card 6ES7952-1AY00-0AA0 is a 64 Mbyte volatile RAM module in the long-design form factor for SIMATIC S7-400 CPUs, used to expand working memory or hold program data during operation. Unlike flash cards, its contents are not retained without battery buffering, and it must be ordered as the exact memory type and size the CPU firmware expects.

Selection Notes

This 64 Mbyte capacity sits far above the smaller Kbyte-class RAM cards used on lighter S7-400 configurations — pick it when the CPU's program and data blocks need more working memory than a small RAM card provides. As with any RAM card, contents rely on the CPU's buffer battery and are lost without it, so it is not a substitute for a Flash-EPROM card where non-volatile retention is required.

Applications

Used as the program/working memory card for SIMATIC S7-400 CPUs configured for larger programs or data blocks that require a RAM card rather than the newer Flash-EPROM memory card format.