Siemens 6ES7951-0KF00-0AA0 | 64KB Flash EPROM Memory Card for S7-300 PLC | Industrial Grade

Siemens 6ES7951-0KF00-0AA0 Flash EPROM Memory Card (Industrial-Grade Storage Solution for S7-300 PLC)

The Siemens 6ES7951-0KF00-0AA0 is a 64KB Flash EPROM memory card engineered specifically for SIMATIC S7-300 programmable logic controllers. Through non-volatile flash memory technology and plug-and-play architecture, it enables reliable program storage, rapid backup, and seamless project migration across automation systems.

Designed for industrial environments where program integrity and system uptime are critical—including manufacturing plants, process control facilities, building automation systems, and OEM machinery—this memory card addresses challenges such as program loss during power failures, time-consuming manual backups, version control complexity, and equipment commissioning delays.

With factory-certified quality, standardized form factor, and broad compatibility across S7-300 CPU families, the 6ES7951-0KF00-0AA0 delivers dependable performance for system integrators, control engineers, maintenance teams, and automation solution providers. Contact our technical team for application guidance and procurement support.

Core Functions & Advantages

Non-Volatile Program Storage
Utilizes Flash EPROM technology to retain PLC programs, data blocks, and configuration parameters without battery backup, eliminating risks of program loss during power interruptions or CPU replacements.

Plug-and-Play Installation
Features standardized card slot interface compatible with S7-300 CPU modules, enabling tool-free insertion and automatic recognition by STEP 7 programming software—reducing commissioning time by up to 40% compared to manual program transfers.

Rapid Backup & Cloning
Supports one-step program extraction and duplication for identical machines or production lines, streamlining version control, disaster recovery, and multi-site deployment workflows.

Enhanced System Reliability
Provides independent storage layer separate from CPU internal memory, protecting against firmware corruption, accidental overwrites, and unauthorized modifications—critical for validated processes in pharmaceutical and food industries.

Extended Operating Temperature Range
Rated for -25°C to +70°C ambient conditions with industrial-grade components, ensuring stable performance in harsh environments including outdoor enclosures, foundries, and cold storage facilities.

Compact & Durable Design
Housed in shock-resistant plastic casing with gold-plated contacts, the card withstands vibration, dust, and humidity typical of factory floors while occupying minimal panel space.

Typical Application Scenarios

This memory card is ideal for automation systems requiring program portability, version management, and fail-safe operation, particularly in:

Manufacturing & Assembly Lines
Enables rapid program deployment across multiple identical workstations, supports A/B testing of process recipes, and facilitates quick recovery from equipment failures without halting production schedules.

Process Control & SCADA Systems
Maintains validated control logic for chemical batching, water treatment, and energy management applications where regulatory compliance demands traceable program archives and change documentation.

Building Automation & HVAC
Stores seasonal control strategies, occupancy schedules, and energy optimization algorithms for commercial buildings, allowing facility managers to swap configurations during system upgrades or tenant changes.

OEM Machinery & Packaging Equipment
Provides machine builders with standardized program distribution method for global installations, simplifies remote troubleshooting through program comparison, and reduces spare parts inventory by consolidating storage media.

Retrofit & Legacy System Upgrades
Bridges older S7-300 installations with modern programming practices, enabling incremental migration to TIA Portal while preserving existing STEP 7 Classic projects and minimizing downtime risks.

Technical Parameters & Selection Guide

To ensure optimal compatibility and performance, the following specifications define the 6ES7951-0KF00-0AA0 memory card capabilities:

Storage Capacity: 64 KB (kilobytes)
Memory Type: Flash EPROM (Electrically Erasable Programmable Read-Only Memory)
Compatible CPUs: SIMATIC S7-300 series (CPU 312 IFM and higher models with card slot)
Interface: Proprietary Siemens card slot connector
Programming Software: STEP 7 V5.x (Classic) / TIA Portal V13 and later
Operating Temperature: -25°C to +70°C (-13°F to +158°F)
Storage Temperature: -40°C to +85°C (-40°F to +185°F)
Relative Humidity: 5% to 95% non-condensing
Vibration Resistance: IEC 60068-2-6 compliant
Shock Resistance: IEC 60068-2-27 compliant
Dimensions: 45 mm × 37 mm × 3.3 mm (L × W × H)
Weight: Approximately 10 grams
Certifications: CE, UL, cULus, RCM

Selection Recommendations:
When specifying memory cards, consider: total program size including organization blocks (OBs), function blocks (FBs), data blocks (DBs), and symbol tables; future expansion requirements for additional logic or recipe storage; environmental conditions at installation site (temperature extremes, vibration levels); and whether battery-free operation is mandated by safety or maintenance policies. For projects exceeding 64KB, evaluate higher-capacity cards (128KB, 256KB models) or CPU models with expanded internal memory. Our application engineers can review your STEP 7 project file to recommend appropriate storage configuration—contact us with CPU model number and estimated program footprint.

Extended Functionality

Program Version Management
Maintain multiple card copies labeled by revision date or machine serial number, enabling side-by-side comparison during troubleshooting and rollback to known-good configurations after unsuccessful modifications.

Offline Programming Support
Develop and test PLC programs in office environment using STEP 7 simulation tools, then transfer finalized code to card for field installation—reducing on-site commissioning time and minimizing production disruptions.

Security & Access Control
Combine with CPU password protection and physical card removal to prevent unauthorized program changes, meeting cybersecurity requirements for critical infrastructure and defense applications.

Integration with HMI & SCADA
Store coordinated PLC and HMI project versions on card alongside operator panel configurations, ensuring synchronized updates across control and visualization layers during system upgrades.

Delivery, Service & Quality Assurance

Lead Time: Standard catalog items ship within 3-5 business days from regional warehouses; bulk orders or custom labeling may require 7-14 days depending on quantity and destination.
Warranty: 12-month manufacturer's warranty covering defects in materials and workmanship under normal operating conditions.
Technical Support: Remote assistance available for card formatting, program transfer procedures, and compatibility verification; on-site commissioning support can be arranged for large-scale deployments (subject to location and project scope).
Documentation Package: Each shipment includes product datasheet, quick installation guide, and certificate of conformity; detailed technical manuals and STEP 7 integration instructions available for download from support portal.
Quality Certifications: Factory-sealed packaging with serialized labels for traceability; products sourced through authorized Siemens distribution channels with full compliance to ISO 9001 quality management standards.

Frequently Asked Questions (FAQ)

Q: How do I transfer a PLC program to the Siemens 6ES7951-0KF00-0AA0 memory card?
A: Using STEP 7 software, connect to the S7-300 CPU via MPI/PROFIBUS or Ethernet interface, navigate to PLC > Download to Memory Card, select the target card slot, and initiate transfer. Ensure CPU is in STOP mode and card is properly inserted before starting. The process typically completes in 10-30 seconds depending on program size.

Q: Can this 64KB Flash EPROM card be used with S7-400 or S7-1200 controllers?
A: No, the 6ES7951-0KF00-0AA0 is designed exclusively for S7-300 CPU modules with compatible card slots. S7-400 systems use different memory card form factors (e.g., 6ES7952 series), while S7-1200/1500 controllers utilize SD card-based storage. Always verify CPU model compatibility before ordering.

Q: What is the expected lifespan and write cycle limit for this Flash EPROM card?
A: Siemens specifies minimum 100,000 erase/write cycles for Flash EPROM technology under normal conditions. In typical industrial applications with infrequent program updates (monthly or quarterly), the card can reliably serve 10+ years. Avoid using as frequently-written data logger; reserve for program storage and configuration backup purposes.

Q: Does the memory card require special environmental protection or installation precautions?
A: The card is rated IP20 and should be installed inside control cabinets with adequate dust and moisture protection. Ensure CPU card slot cover is closed after insertion to prevent contamination. For outdoor or washdown environments, verify enclosure meets minimum IP54 rating. Avoid hot-swapping (inserting/removing while CPU is powered) to prevent data corruption.

Q: Can I clone programs across multiple machines using a single memory card?
A: Yes, this is a common workflow for OEMs and multi-line installations. Program the first machine, extract program to card, then sequentially insert card into additional CPUs and upload contents. Note that hardware-specific parameters (I/O addresses, network settings) may require adjustment per machine; consider using symbolic addressing and hardware configuration templates to streamline deployment.

Q: Is remote monitoring or diagnostics data stored on the memory card?
A: The card primarily stores user programs, data blocks, and CPU configuration. Diagnostic buffers and real-time process data reside in CPU RAM. For remote monitoring, integrate with SCADA systems via PROFIBUS/PROFINET or implement data logging to separate storage media (e.g., industrial SD cards on HMI panels).

Request Technical Support & Quotation

For detailed application engineering, custom configuration assistance, or volume pricing, please provide the following project information:

• Project name and industry sector
• S7-300 CPU model number(s) and quantity
• Estimated program size (KB) and number of data blocks
• Operating environment conditions (temperature range, vibration, humidity)
• Required delivery timeline and destination country
• Any specific certifications or documentation requirements (ATEX, SIL, material certificates)

Our automation specialists will respond within 24 hours with tailored recommendations, compatibility confirmation, and competitive quotations including shipping options.

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