Siemens SIMATIC S7 Memory Card 256kB 6ES7951-1KH00-0AA0

Description

This is a genuine Siemens SIMATIC S7 Memory Card designed for use with S7-300, C7, and ET 200 series controllers. With a capacity of 256 kBytes, this Flash EPROM card provides reliable storage for your PLC programs and data. It is an essential spare part for maintaining and servicing legacy automation systems that rely on this proven technology.

Specifications

• Manufacturer: Siemens
• Product Line: SIMATIC S7
• Product Type: Memory Card
• Memory Type: Flash EPROM
• Memory Size: 256 kByte
• Voltage: 5V

Label Info

• Part Number: 6ES7 951-1KH00-0AA0
• Serial Number (SVP NO): 149372

Application

This memory card is specifically used for loading and storing user programs, data blocks, and system configurations on compatible Siemens PLCs. It is crucial for system backup, program transfer, and firmware updates on older S7-300 platforms.

Country of Origin

Made in Germany

CO2 Impact

Opting for this reused component prevents the emission of approximately 1.0 kg of CO2, which would have been generated during the production of a new one. This is comparable to saving the emissions of a 5-kilometer car drive.

Availability

This is an obsolete item, available from our stock while supplies last. Ideal for repairs and extending the life of existing installations. Order now from PLC2Day for expert support and fast delivery.

FAQ

Is this 5V Flash memory card compatible with newer 3.3V S7-300 CPUs?

While the label states 5V, this card series was designed for the S7-300 family, which transitioned to 3.3V technology. This card is generally compatible with CPUs that specify this part number, but always check the CPU's specific hardware manual for memory card compatibility to avoid any issues.

Not directly in all cases. Newer SIMATIC Memory Cards (SMC) have a different format and technology. They are only compatible with newer S7-300 CPUs (typically those with firmware V2.6 or higher) and S7-400 CPUs. For older CPUs, you must use this specific Flash EPROM type.

Unlike modern SMC cards, these Flash EPROM cards can be completely erased using a SIMATIC Field PG/Power PG or via the STEP 7 software with a compatible CPU. The 'Format Memory Card' or 'Delete Memory Card' function in the PLC hardware configuration or online tools will perform this action.

Last Update: Friday, March 13, 2026

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