The Siemens SIMATIC S7 Micro Memory Card 2MB (6ES7953-8LL31-0AA0) is a compact Flash-EPROM memory card designed for Siemens SIMATIC S7-300 PLCs, C7 control systems, and ET 200 distributed I/O CPUs. It provides reliable, non-volatile retention of user programs, system parameters, and operational data without requiring a backup battery. This 2MB memory card ensures fast data transfer and automatic program loading during system power cycles.
The Siemens 6ES7953-8LL31-0AA0 Micro Memory Card (MMC) serves as essential external storage for SIMATIC S7-300 PLCs, C7 integrated controllers, and ET 200 station CPUs. Utilizing Flash-EPROM storage technology, it holds execution programs and system project data securely.
Main Features
Featuring a memory capacity of 2MB, this MMC stores ladder logic programs, system parameters, user data blocks, and firmware updates. It fits into standard S7-300 memory slots and communicates directly with the controller CPU backplane.
Benefits
The non-volatile Flash-EPROM architecture eliminates the need for maintenance batteries, retaining critical control logic and configurations during total power failures. It facilitates fast CPU replacements and program transfers without specialized field programming tools.
Applications
This memory card is widely used across industrial manufacturing facilities, automated processing plants, and specialized machinery—including Bruckner and Stenner processing equipment. It supports continuous operations in packaging lines, textile manufacturing, and automated assembly systems.
Key Features
| Specification | Details |
| Brand | Siemens |
| Model | 6ES7953-8LL31-0AA0 |
| Product Type | SIMATIC S7 Micro Memory Card (MMC) |
| Memory Size | 2 MB |
| Memory Type | Flash-EPROM |
| Compatibility | SIMATIC S7-300, C7, ET 200 CPUs |
| Data Retention | Minimum 10 years |
| Write/Erase Cycles | Min. 100,000 write/erase cycles |
| Dimensions (W x H x D) | 24 x 32 x 1.4 mm |
| Weight | Approx. 0.003 kg |
| Rated Voltage | Not specified by manufacturer |
| Rated Current | Not specified by manufacturer |
| Warranty | Standard Manufacturer Warranty |
Q: What is the main purpose of the Siemens 6ES7953-8LL31-0AA0 MMC?
A: It stores the operating program, system parameters, and data blocks for Siemens S7-300, C7, and ET 200 controllers.
Q: Is a battery needed to maintain program data on this memory card during a power outage?
A: No, the card uses non-volatile Flash-EPROM memory, which retains data automatically without requiring a backup battery.
Q: Can this 2MB MMC card be formatted in a standard PC card reader?
A: No, formatting the card using a standard Windows PC file system will damage the internal Siemens formatting. It should only be formatted using a Siemens Field PG or TIA Portal / STEP 7 software with a compatible Siemens card reader.
Q: What controllers are compatible with this memory card?
A: It is compatible with Siemens SIMATIC S7-300 CPUs, SIMATIC C7 controllers, and ET 200 CPUs that utilize the Micro Memory Card (MMC) form factor.
Q: Can this memory card be used to transfer programs between PLCs?
A: Yes, inserting an MMC containing a valid program into a compatible CPU allows the controller to load the project automatically upon startup.
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