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SIEMENS 6ES7953-8LJ11-0AA0 Micro Memory Card

Product Description

The SIEMENS 6ES7953-8LJ11-0AA0 is a 512KB Micro Memory Card (MMC) designed for SIMATIC S7-300, C7, and ET 200S/IM151 CPU systems. It serves as a non-volatile storage medium for PLC programs, configuration data, and firmware updates, ensuring data retention even during power loss. This 3.3V Flash-EPROM card is essential for backup, program transfer, and system recovery in industrial automation environments .

Key Features & Advantages

Reliable Data Storage
- 512KB memory capacity, suitable for small to medium PLC applications .
- Flash-EPROM technology ensures 100,000 write/erase cycles and 10-year data retention under standard conditions (0–60°C) .
Critical for Modern S7-300 CPUs
- Required for newer S7-300 CPUs (e.g., CPU313/314/315-2DP/317-2DP) that lack built-in load memory, acting as the sole storage for user programs .
- Automatically backs up DB block data from RAM to MMC during power-off .
Robust Industrial Design
- Compact dimensions (24 × 32 × 1.4 mm) and lightweight (0.01 kg).
- IP20 protection against dust and accidental contact .
Flexible Data Management
- Supports SFC82/83/84 functions for direct read/write operations to load memory .
- Compatible with STEP 7 programming tools for downloads, deletions, and passive formatting .

Technical Specifications

Parameter	Specification
Memory Type	Flash-EPROM
Capacity	512 KB
Voltage	3.3V
Write/Erase Cycles	100,000 (0–60°C)
Data Retention	10 years
Compatibility	S7-300, C7, ET 200S/IM151 CPUs
Operating Temp.	0°C to +60°C
Certifications	CE, RoHS

Applications

Program backup & restoration for S7-300 PLCs .
Firmware updates and recipe storage in manufacturing (e.g., automotive, packaging) .

Installation & Safety Notes

Handling: Avoid electrostatic discharge and touching metal contacts to prevent damage .
Power: Never hot-swap; always power off the PLC before inserting/removing the card .
Formatting: Use only Siemens PG or approved readers to avoid corruption .
Environment: Operate within 0–60°C; higher temperatures reduce lifespan .