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Core Functionality and Application
The Siemens 6ES5373-0AA21 memory module provides supplementary program and data storage for SIMATIC S5 PLC systems. This RAM module expands the memory capacity of S5 CPUs for larger control applications. It plugs directly into the CPU’s submodule slot. Additionally, the module enables the storage of user programs and system parameters for increased functionality.
Technical Specifications
The following table details the core technical parameters for the Siemens 6ES5373-0AA21:
| Parameter | Specification |
|---|---|
| Model Number | 6ES5373-0AA21 |
| Product Type | Memory Module / Submodule |
| Memory Technology | RAM (CMOS) |
| Memory Capacity | 512 bytes |
| Battery Backup | Lithium battery (1 x CR2032) |
| Battery Life | 1-2 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 | Obsolete / Discontinued |
Design and Installation Features
The Siemens 6ES5373-0AA21 features a compact, credit-card-sized design for easy installation. It slides directly into the S5 CPU’s submodule slot without any cabling or tools. The module’s lightweight construction places minimal mechanical stress on the connector. A replaceable lithium battery maintains memory contents during power interruptions. This battery backup feature prevents program loss and ensures reliable system operation.
System Compatibility
The Siemens 6ES5373-0AA21 works with smaller S5 CPU models, including the S5-90U through S5-110U series. It expands the memory capacity of these CPUs for simple to medium applications. Programmers can store user programs, step tables, and system parameters on the module. Users should note that Siemens has discontinued this product without a direct replacement.
Replacement Recommendation
For new installations requiring similar functionality, consider the Siemens 6ES5373-1AA21-0AA0 as a potential replacement. However, verify specific application requirements before purchasing any memory module. The compact design and simple installation make this module a practical solution for legacy S5 systems. Stock availability may be limited due to the product’s discontinued status.