The Siemens 6ES7955-2AM00-0AA0 is a RAM expansion module for the SIMATIC S7-400 family, providing 8 Mbyte of memory split as 4 Mbyte data and 4 Mbyte code. It is specifically designated as a replacement part for the CPU417-4 V3 and CPU417H V3 processors. This is not a general-purpose memory card for all S7-400 CPUs — it targets the high-end 417-series controllers used in redundant (H) and high-performance applications. The 8 Mbyte capacity supports larger code bases and data blocks than the base CPU memory.
Siemens 6ES7955-2AM00-0AA0 S7-400 RAM Expansion, 8 Mbyte
MPN6ES7955-2AM00-0AA0
Siemens SIMATIC S7-400, RAM expansion 8 MB (4 MB data + 4 MB code) for CPU417-4 V3 and CPU417H V3, order code 6ES7955-2AM00-0AA0.
$896.62Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Memory size | 8 Mbyte |
| Weight, approx. | 44 g |
| Belongs to product | S7-400 |
Product details
Frequently asked questions
What is the memory size of this module?
The module provides 8 Mbyte of memory, split as 4 Mbyte data and 4 Mbyte code.
Which CPUs is this replacement part for?
It is specifically designated as a replacement part for the CPU417-4 V3 and CPU417H V3 processors in the SIMATIC S7-400 family.
How do I source this part?
This part is sourced to order against an RFQ. Submit a request with your quantity and required delivery window for a firm quote.
MPN
6ES7955-2AM00-0AA0