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Volatile Memory Expansion for S7-400 CPUs
The Siemens 6ES7952-1AM00-0AA0 RAM memory card provides 4 MB of volatile storage for the SIMATIC S7-400 long design CPUs. This memory card expands the CPU’s load memory, allowing you to store larger user programs and data blocks. It serves as an ideal solution for projects requiring frequent online modifications to hardware configuration and programs.
This card uses RAM technology, which means it loses all stored data when the CPU loses power. Therefore, you must maintain the CPU’s backup battery to preserve program and data integrity during power outages. The card features a long design format measuring 7.5 mm x 57 mm x 87 mm and weighs approximately 55 g. Its typical current consumption under 5 V reaches 45 mA, with a maximum of 100 mA.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Siemens |
| Model | 6ES7952-1AM00-0AA0 |
| Product Category | RAM Memory Card |
| System Compatibility | SIMATIC S7-400 (long design) |
| Memory Size | 4 MB |
| Memory Type | RAM (volatile) |
| Dimensions (W x H x D) | 7.5 mm x 57 mm x 87 mm |
| Weight | Approx. 55 g |
| Current Consumption (5 V) | Typ. 45 mA, max. 100 mA |
| Backup Current | Typ. 5 µA, max. 60 µA |
| Certifications | UL, CSA, ATEX, FM, DNV, ABS, BV, LR, NK, RINA, RMRS, CCS, KC, RCM, CCC, IECEx |
The Siemens 6ES7952-1AM00-0AA0 supports online hardware configuration changes (CiR), making it suitable for PCS 7 projects that require uninterrupted operation during modifications. Unlike FEPROM cards, this RAM card allows direct downloading of programs through the standard download function in STEP 7. Its backup current consumption of only 5 µA ensures minimal drain on the CPU’s battery. This memory card carries multiple marine and hazardous location certifications, including ABS, DNV, and ATEX, for use in diverse industrial environments. The 4 MB capacity accommodates medium-sized S7-400 applications, including program code and data blocks. For larger projects, consider higher capacity RAM cards such as 8 MB or 16 MB versions.