SIEMENS 6ES5 374-1KH21

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 profideals 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 profideals is not an authorized distributor, reseller or representative of the products featured on this website. All product names, trademarks, brands and logos used on this site are the property of their respective owners. The depiction, description or sale of products featuring these names, trademarks, brands and logos is for identification purposes only and is not intended to indicate any affiliation with or authorization by any rights holder.