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Core Functionality and Application
The Siemens 6ES5372-0AA51 memory submodule stores user programs and system parameters for SIMATIC S5 PLCs. This plug-in module expands the memory capacity of S5 CPUs for larger control applications. It provides additional storage for program blocks, data blocks, and configuration settings . Furthermore, the module offers a practical solution for upgrading legacy S5 systems with limited onboard memory.
Technical Specifications
The following table details the core technical parameters for the Siemens 6ES5372-0AA51:
| Parameter | Specification |
|---|---|
| Model Number | 6ES5372-0AA51 |
| Product Type | Memory Submodule / RAM Module |
| Memory Technology | CMOS RAM |
| Memory Capacity | 512 bytes |
| Battery Backup | Lithium battery (CR2032 or compatible) |
| Battery Life | Up to 2 years (typical) |
| Compatible CPUs | S5-90U, S5-95U, S5-100U, S5-101U, S5-110U |
| Dimensions | 7.20 × 5.00 × 0.30 cm (2.83 × 1.97 × 0.12 in) |
| Weight | 0.02 kg (0.04 lbs) |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -20°C to 70°C |
| Country of Origin | Germany |
| Lifecycle Status | Discontinued (legacy part) |
Design and Installation Features
The Siemens 6ES5372-0AA51 features a credit-card-sized form factor that plugs directly into the CPU’s submodule slot. This compact design requires no tools or additional wiring for installation . The module’s lightweight construction places minimal stress on the connector. A replaceable lithium battery maintains memory contents during power outages, which prevents data loss . Users should replace the battery periodically to ensure continued reliable operation .
System Compatibility and Use Cases
The Siemens 6ES5372-0AA51 works with S5-90U through S5-110U PLC models, which are common in smaller automation applications. It stores user programs, step tables, bit memories, and system parameters for these CPUs . Programmers use this module for small to medium-sized control tasks in legacy S5 systems . This submodule serves as a cost-effective upgrade when onboard memory proves insufficient . Users should note that Siemens has discontinued this product without a direct replacement .