SIMATIC S5 256 KB Flash EPROM memory card
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Siemens 6ES5374-1KH21 is a short-format SIMATIC S5 memory card. It uses 5 V Flash EPROM memory with a capacity of 256 KB. As a legacy S5 component, it should be matched to the exact CPU before replacement.
The 1KH21 version is not identical to 2KH21 or 2FH21 cards. These variants differ in mechanical format and memory details, so the complete catalog number is more important than the 256 KB capacity alone when servicing an existing machine.
Manufacturer documentation is available from Siemens Industry Online Support. For comparison, see also 6ES5374-2KH21 and 6ES5374-2FH21 in our catalog.
If the card is intended as a replacement in an operating controller, compare the old card number and CPU model. We can help verify the required version if necessary.
