Siemens 6ES7953-8LG11-0AA0 MMC Card

128 KB Flash Memory Card for S7-300, C7, and ET 200S Systems

The 6ES7953-8LG11-0AA0 serves as a SIMATIC S7 Micro Memory Card (MMC) for the S7-300, C7, and ET 200S platforms . This 128 KB flash memory card stores user programs, configuration data, and firmware updates for your PLC system . It acts as the load memory for the CPU, which means the controller cannot run without this card inserted. Furthermore, this MMC card retains data reliably even during power outages, ensuring seamless system recovery. Please note that this model is a spare part and Siemens has discontinued active production since October 2017, with successor model 6ES7953-8LG31-0AA0 now available .

Technical Specifications

The table below details the key technical parameters for the 6ES7953-8LG11-0AA0 Micro Memory Card.

Parameter	Specification
Manufacturer	Siemens
Product Type	SIMATIC Micro Memory Card (MMC)
Series	S7-300, C7, ET 200S
Memory Capacity	128 KB
Technology	3.3 V N-Flash
Dimensions (W x H x D)	91 mm x 101 mm x 5 mm
Net Weight	Approx. 0.018 kg
EAN	4025515070757
Country of Origin	Germany
Product Lifecycle	Discontinued (PM500) since 01/10/17
Successor Model	6ES7953-8LG31-0AA0

Application and Functionality

The 6ES7953-8LG11-0AA0 provides three essential functions for S7-300, C7, and ET 200S systems. It serves as the CPU’s load memory, which means the CPU will not operate without this card inserted. In addition, this card stores the entire project, including symbols and comments, directly in the CPU . The MMC card also stores data during power interruptions and supports firmware updates for the CPU . For firmware updates, you will need an MMC card with at least 2 MB capacity, so this 128 KB version primarily suits program storage and data backup tasks . Consequently, this card remains a vital component for maintaining legacy S7-300 systems, though users should plan for eventual migration to the successor model for new installations.