The 6ES7291-8GF23-0XA0: The module plugs into the CPU's memory slot—no tools needed, no fieldbus configuration. The 64 kbyte Flash-EPROM holds the full project plus data logs; if you're swapping a CPU that had a smaller memory module, download the project first to avoid a size mismatch error on power-up.
Listed as current production. No official successor announced—this is the standard memory option for S7-22X CPUs running firmware that supports the module. For a planned shutdown, order against the BOM line; lead time is quoted per RFQ. Keep one on the shelf if your line runs data-logging-heavy sequences that need the full 64 KB.