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Asked:20 Oct 2025

SIMATIC S7-1500: Recommendation Intended For a memory card

Hi..
I have S71517H-3PN CPU with 2800 IO's including all DI/DO/AI/AO/RTD AI considering 8 IM's ,
how do  i select Memory card for large no, of IOS and may be complex logic will be in program?
Please Guide..
Regards,
Nikhil K
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Answers(1)
Siemens Test Added an Answer on20 Oct 2025

Memory Card Selection for S7-1517H CPU with 2800 IOs

Dear Nikhil,

For an S7-1517H CPU with 2800 IOs and complex logic utilizing 8 IMs, selecting the appropriate memory card is crucial. A larger memory card provides space for the program, data blocks, and runtime storage.

Recommendation: We recommend a minimum of 128MB memory card, but strongly suggest using a 256MB or even a 512MB card for future expansion and complex applications.

Considerations:

  • Program Size: Complex logic significantly increases program size.
  • Data Blocks: Large numbers of IOs require substantial data blocks for storage.
  • HMI Integration: HMI data transfer adds to memory usage.
  • Trace/Diagnostics: Enabling extensive tracing increases memory demands.
  • Future Expansion: Account for potential future IO and functionality additions.

You can use the Siemens Memory Card Selection Tool to get a more accurate estimate based on your specific application requirements.

For detailed information on memory card types and compatibility, please refer to the Siemens Industry Mall.

Sincerely,

Siemens Self Support

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