Industrial Automation Memory Solution – Siemens 6ES7953-8LG30-0AA0 | SIMATIC S7-300 Series
Where This Product Is Used
The Siemens 6ES7953-8LG30-0AA0 Micro Memory Card (MMC) is the standard non-volatile storage medium for SIMATIC S7-300 CPUs. It is deployed across a wide range of industrial automation environments where reliable, persistent program and data storage is critical:
- Automotive Manufacturing Lines – Stores PLC programs for robotic welding, stamping, and assembly cells where power-loss data retention is mandatory.
- Chemical & Pharmaceutical Plants – Retains batch recipes and safety interlocks in SIL-rated control loops; supports FDA 21 CFR Part 11 audit trail requirements.
- Water & Wastewater Treatment – Maintains pump sequencing logic and SCADA interface programs through frequent power cycling in remote pump stations.
- Food & Beverage Processing – Holds CIP (Clean-In-Place) cycle programs and conveyor control logic in high-humidity environments.
- Power Generation & Utilities – Archives firmware and configuration data for turbine governor and substation automation controllers.
- Machine Tool & OEM Equipment – Enables fast CPU replacement and program cloning on CNC machining centers and packaging lines without a programming device.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (MLFB) | 6ES7953-8LG30-0AA0 |
| Series | SIMATIC S7-300 |
| Memory Capacity | 8 MB |
| Memory Type | Flash (Non-Volatile) |
| Form Factor | Micro Memory Card (MMC) |
| Compatible CPUs | S7-300 CPUs with MMC slot (e.g., CPU 312, 314, 315, 317, 319) |
| Data Retention | 10 years without power |
| Write Cycles | ≥ 100,000 |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -20 °C to +85 °C |
| Dimensions (W×H×D) | 11 mm × 15 mm × 1 mm |
| Weight | ~1 g |
| Firmware Update Support | Yes |
| Program Backup | Yes (CPU-independent storage) |
Why Engineers Specify This Model
- Mandatory for S7-300 Operation – Most S7-300 CPUs require an MMC to store the user program; without it, the CPU cannot retain logic after power-off.
- 8 MB Capacity – The 8LG30 variant provides ample space for large structured programs (STL/LAD/FBD), data blocks, and firmware images, eliminating capacity constraints on complex projects.
- Zero-Battery Dependency – Flash-based storage eliminates the battery backup required by older memory modules, reducing maintenance overhead and failure risk.
- CPU Swap Without STEP 7 – A pre-loaded MMC allows field technicians to replace a faulty CPU and restore full operation without a laptop or programming cable.
- Siemens Genuine Part – Ensures compatibility with STEP 7 v5.x and TIA Portal migration tools; counterfeit cards risk data corruption and CPU faults.
Complete System Bill of Materials
For a complete S7-300 control system using this MMC, engineers typically specify:
- SIMATIC S7-300 CPU (e.g., 6ES7315-2EH14-0AB0 CPU 315-2 PN/DP)
- Power Supply Module (e.g., 6ES7307-1EA01-0AA0 PS 307 5A)
- Digital I/O Module (e.g., 6ES7321-1BL00-0AA0 SM 321 DI 32×DC24V)
- Analog Input Module (e.g., 6ES7331-7KF02-0AB0 SM 331 AI 8×13Bit)
- PROFIBUS DP Cable & Connectors (6XV1830-0EH10)
- DIN Rail & Mounting Hardware (6ES7390-1AE80-0AA0)
- 6ES7953-8LG30-0AA0 Micro Memory Card (this item)
Compliance & Industry Standards
- CE Marking – Compliant with EU Low Voltage and EMC Directives
- UL Listed – Recognized under UL 508 (Industrial Control Equipment)
- IEC 61131-2 – Programmable Controller Hardware Standard
- RoHS Compliant – Restriction of Hazardous Substances Directive 2011/65/EU
- ATEX / IECEx – Suitable for use in S7-300 systems deployed in Zone 2 hazardous areas (when installed in approved enclosures)
Quality Assurance & Sourcing
Konmask.com sources the 6ES7953-8LG30-0AA0 exclusively through authorized Siemens distribution channels and verified industrial surplus partners. Every unit undergoes:
- Visual inspection for label authenticity and physical integrity
- Functional read/write verification using Siemens-compatible card readers
- Anti-static packaging with humidity indicator cards
- Lot traceability documentation available upon request
We do not source from unverified grey-market channels. Certificate of Conformity (CoC) and test reports are available for OEM and system integrator orders.
How to Source This Part
- In-Stock Orders – Add to cart and check out. Most orders ship within 1–2 business days via DHL Express or FedEx International Priority.
- Bulk / Project Quantities – Contact us for volume pricing and lead-time commitments for quantities ≥ 10 units.
- Urgent Replacement – Email support@konmask.com with your project timeline; we offer expedited sourcing for critical downtime situations.
- Cross-Reference / Substitution – If you need an alternative capacity (e.g., 4MB 6ES7953-8LF30-0AA0 or 64MB 6ES7953-8LM31-0AA0), contact us for availability.
Application-Specific FAQ
- Q: Can I use this MMC with a CPU 317-2 DP?
- A: Yes. The 6ES7953-8LG30-0AA0 is compatible with all S7-300 CPUs that feature an MMC slot, including the CPU 317-2 DP (6ES7317-2AK14-0AB0).
- Q: Will the program survive a power outage?
- A: Yes. Flash memory retains data for a minimum of 10 years without power, with no battery required.
- Q: Can I use this card to clone a CPU program to a replacement unit?
- A: Yes. Insert the pre-programmed MMC into the replacement CPU; it will load the program automatically on first power-up without a STEP 7 connection.
- Q: Is this compatible with TIA Portal?
- A: The MMC itself is hardware-agnostic. TIA Portal can download programs to S7-300 CPUs using this card via the CPU’s MPI/PROFIBUS/Ethernet interface.
- Q: What is the difference between 8LG30 and 8LG31?
- A: The -0AA0 suffix denotes the standard commercial version. The -0AA1 revision may include minor firmware or manufacturing updates but is functionally equivalent and cross-compatible.
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