SIEMENS 6ES5 374-1KH21
- By SIEMENS
- Part #: 6ES5 374-1KH21
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Siemens SIMATIC S5 256kB Flash Memory Card 6ES5 374-1KH21
Description
This module provides reliable program storage for legacy Siemens SIMATIC S5 PLC systems. This 256 kByte Flash EPROM module is essential for maintenance and backup of automation applications on S5-115U/H/F, S5-135U/F, and S5-155U/H/F controllers.
Specifications
- Manufacturer: Siemens
- Product Line: SIMATIC S5
- Part Number: 6ES5 374-1KH21
- Product Type: Flash EPROM Memory Card
- Memory Capacity: 256 kByte
- Technology: 5V Flash EPROM
Label Info
- MLFB: 1P 6ES5 374-1KH21
- Internal Code: SVP P9 148422
Application
Used for storing and executing user programs in Siemens S5 series programmable logic controllers, extending the life of established manufacturing and process control systems.
Country of Origin
Made in Germany.
CO2 Impact
Reusing this part saves approximately 1.0 kg of CO2, contributing to a more sustainable industrial environment by avoiding the production of a new component.
Availability
This is an obsolete item, available from our stock as a tested, used component. Order now from spareparts2day for expert support and fast delivery.
FAQ
Is this memory card compatible with all SIMATIC S5 CPUs?
No, this 256kB Flash EPROM is specifically designed for use with higher-end S5 CPUs like the S5-115U/H/F, S5-135U/F, and S5-155U/H/F. Always verify CPU compatibility in the system manual before installation.
Can I program this module with a standard EPROM programmer?
Programming this module requires a Siemens PG (Programming Device) with the appropriate Step 5 software and adapter. A standard EPROM programmer will not work due to the proprietary format and interface.
What is the difference between an EPROM and a Flash EPROM like this one?
A standard EPROM requires removal from the PLC and exposure to ultraviolet light to be erased. This Flash EPROM can be erased and reprogrammed electrically while installed in the PG, making program changes much faster and more convenient.
Friday, March 13, 2026
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