PLC | Siemens | 6ES7953-8LL31-0AA0 6ES7 953-8LL31-0AA0 SIMATIC S7 Micro Memory Card

Product Description: 6ES7953-8LL31-0AA0

The 6ES7953-8LL31-0AA0 is a 4 MB Micro Memory Card designed for SIMATIC S7-300 CPUs. It provides non-volatile storage of user programs, data blocks, and system firmware. Installed in the CPU’s MMC slot, it is essential for CPU startup—loading and executing the control program from the card—and allows easy transfer, backup, and update of automation projects. Built to industrial- grade standards, it ensures reliable data retention even in harsh environments.

Key Features

• 4 MB Storage Capacity: Accommodates medium-sized programs, data blocks, and recipes
• Non-Volatile Memory: Retains all contents without battery or external power
• Firmware Support: Enables CPU firmware upgrades via the card
• Robust Design: Industry-grade durability for repeated write cycles
• Plug-and-Play: Simple insertion/removal; hot-swap in maintenance windows

Technical Specifications

• Capacity: 4 MB
• Form Factor: Proprietary SIMATIC MMC
• Data Retention: ≥ 10 years (without power)
• Endurance: ≥ 100 000 write cycles
• Temperature Range: 0 °C … +60 °C
• Supply Voltage: Supplied via CPU MMC slot
• Compatibility: S7-300 CPUs with MMC interface
• Functions: Program/data storage, firmware updates
• Dimensions (approx.): 24 × 32 × 2.1 mm
• Weight: ≈ 5 g

Application Areas

• Program Storage & Execution: Primary load memory for S7-300 CPUs
• Project Backup & Transfer: Move automation projects between engineering stations and PLCs
• Firmware Maintenance: Upgrade CPU firmware to latest revisions
• Data Logging: Store recipe or batch data for process control

Advantages

• High Reliability: Proven in industrial automation for secure program retention
• Easy Handling: Snap-in installation and removal minimize downtime
• Extended Endurance: Designed for frequent updates and long service life
• Seamless Integration: Fully supported in STEP 7 and TIA Portal for project management
• Cost-Effective: Standardized memory solution across S7-300 platforms