Siemens 6AV1903-0BA01 SIMATIC WinCC Software License

Siemens 6AV1903-0BA01 is a 512 KB SRAM memory module (SRAM card) designed as a dedicated memory expansion accessory for the CP528A communication processor used in SIMATIC automation systems. The SRAM card increases available RAM for the CP528A, enabling more extensive data buffering, larger program/data storage during runtime, and better handling of concurrent I/O tasks within legacy S7-300 configurations, without requiring changes to the processor's firmware or system topology. As an original Siemens accessory, the part carries the 6AV1903-0BA01 designation and appears in distributor listings as a 512 KB SRAM card compatible with CP528A modules, reflecting its role as a hardware upgrade for in-field CP deployments. Experienced technicians specify this module when upgrading aging CP528A installations to maintain performance margins, exactly matching Siemens' memory upgrade approach for CP-based systems.