Siemens Micro Memory Card MMC SIMATIC S7  ET 200 Distributed I/O System 6ES7953-8LJ31-0AA0

The 6ES7953-8LJ31-0AA0 is a SIMATIC S7 Micro Memory Card (MMC) manufactured by Siemens. It is designed for use with SIMATIC S7-300 PLC systems, C7 devices, and ET 200 distributed I/O systems. The card stores the user program, configuration data, and retentive data required for the PLC’s operation.

This memory card uses non-volatile flash technology, meaning stored data remains intact even when power is removed. It is typically inserted into the PLC CPU to enable program loading and data storage in automation applications.

The part is considered a spare part and has been discontinued, with Siemens recommending the successor model 6ES7953-8LJ31-0AA0.

Key Specifications

Functional Features

• Program storage: Holds the PLC user program and configuration.

• Non-volatile storage: Data remains stored without power.

• Removable design: Allows easy transfer of programs between PLCs.

• Industrial reliability: Designed for automation environments using SIMATIC S7-300 platforms.

• Backup capability: Can be used for program backup and firmware data storage.

Typical Applications

• Industrial automation systems

• Factory control systems using SIMATIC S7-300 PLCs

• Distributed I/O systems (ET200)

• Program storage and transfer in PLC maintenance and commissioning

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