Siemens 6ES7954-8LL04-0AA0 SIMATIC S7 Memory Card 256MB Flash PLC Memory Card

The Siemens 6ES7954-8LL04-0AA0 is a SIMATIC S7 memory card with 256MB of Flash-EPROM storage for S7-1x00 CPUs. It supports a minimum of 200,000 write/delete cycles and retains data for 10 years when fewer than 20,000 cycles have been used, or 1 year once past 180,000 write cycles on the card.

Selection Notes

At 256MB this card holds a substantially larger S7-1x00 program, extensive recipe data or logged process data than the smaller-capacity cards in the same line, at the cost of a lower 200,000-cycle write/delete rating versus the higher-cycle, lower-capacity options. It is the card to choose when program size or data logging volume, rather than write endurance, is the limiting factor for the application, and the lower cycle count is rarely reached on CPUs that are not doing constant online reprogramming. The same 24 x 32 x 2.1 mm format as the smaller-capacity cards means no adapter or configuration change is needed when moving to this higher-capacity part.

Applications

Program and data storage for S7-1200/S7-1500 CPUs with larger program sizes, extensive recipe sets, or logged process data over long production runs, and for archiving multiple project versions on a single card during commissioning.