Siemens 6ES5373-1AA61 is a replacement memory module for SIMATIC S5 PLC systems, identified as Speichermodul 373. This part is used as a spare in legacy S5 hardware to store the PLC program and data within compatible memory modules. Typical applications include retrofitting or repairing aging S5 installations where the Speichermodul 373 is required to restore the system’s configuration and program data.
