6ES7953-8LL31-0AA0

Features:

• Storage Medium for S7-300/C7/ET 200 Controller Programs and Configuration Data
• Integrates 2 MB NAND Flash Capacity with 3.3V Low-Voltage Operation
• Functions Seamlessly with SIMATIC S7-300 CPUs, C7 Compact Control Systems, and ET 200 Distributed I/O Stations

The 6ES7953-8LL31-0AA0 serves as the dedicated Micro Memory Card for the SIMATIC S7-300 series, providing reliable non-volatile storage for all user programs and system parameters within the controller. It permanently retains downloaded application logic, hardware configurations, and operational data using Flash-EPROM technology, ensuring that critical automation programs remain intact even during extended power outages. The 6ES7953-8LL31-0AA0 operates at 3.3V with NAND Flash architecture, delivering stable memory performance while minimizing power consumption. With a generous 2 MB memory size, this card accommodates substantial program complexity and data requirements typical of modern industrial control applications. The 6ES7953-8LL31-0AA0 has made significant advancements in durability over previous memory solutions, incorporating a minimum endurance of 100,000 write/delete cycles to support frequent program updates and iterative development workflows.

The 6ES7953-8LL31-0AA0 provides essential memory functions fundamental to the entire S7-300/C7/ET 200 control system, and is a critical component of the operational path, directly affecting the proper, normal execution of the overall automation program. One 6ES7953-8LL31-0AA0 memory card is required per CPU to maintain program persistence and enable portable project deployment across multiple controllers. The card occupies the dedicated MMC slot on the CPU module and is always inserted before power-up to ensure immediate recognition and program loading.

For applications requiring long-term data preservation, the 6ES7953-8LL31-0AA0 guarantees a minimum data retention period of 10 years following the final programming action. This extended retention capability ensures that archived programs, backup configurations, and historical parameter sets remain accessible for maintenance, troubleshooting, and system replication years after initial deployment. The Flash-EPROM architecture executes reliable storage using the non-volatile memory cells specified in the semiconductor design. Using this method, the memory system continually preserves data integrity without requiring backup batteries or auxiliary power sources. If the controller experiences complete power loss or extended shutdown periods, the 6ES7953-8LL31-0AA0 automatically maintains all stored information and enables immediate program resumption upon the next power cycle without manual intervention or data restoration procedures.