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Reliable Program and Data Storage
The Siemens 6ES5375-8LA12 memory submodule provides non-volatile storage for user programs and system parameters. This compact module plugs directly into the CPU or interface module’s dedicated slot. Programmers and maintenance engineers appreciate its quick data retention capabilities during power cycles.
Memory Capacity and Storage Architecture
This submodule offers 64 kilobytes of CMOS RAM with battery backup for data preservation. The memory organizes into 32 kilobytes for program code and 32 kilobytes for data blocks. A replaceable lithium battery maintains the stored content for up to 200 days without external power. Furthermore, the module supports read/write operations at cycle times under 1 microsecond.
| Parameter | Specification |
|---|---|
| Model | Siemens 6ES5375-8LA12 |
| Memory Type | CMOS RAM with battery backup |
| Total Capacity | 64 KB |
| Program Memory | 32 KB |
| Data Memory | 32 KB |
| Battery Type | Lithium (replaceable) |
| Data Retention Time | 200 days (min) |
| Access Time | < 1 μs |
| Dimensions (W x H x D) | 25 mm x 60 mm x 15 mm |
| Weight | 0.08 kg |
| Compatible CPUs | S5-95U, S5-100U, S5-115U |
Battery Backup and Data Integrity
The integrated lithium battery automatically activates when the main supply drops. This battery preserves all program and data blocks during maintenance or unexpected outages. A low-battery warning LED alerts users approximately 30 days before depletion. You can replace the battery without losing stored data by following the hot-swap procedure. Additionally, the module performs a cyclic redundancy check (CRC) on power-up to verify memory integrity.
Physical Design and Installation
This memory submodule features a compact, lightweight design of only 80 grams, which minimizes mechanical stress on the connector. The plastic housing with keyed pins prevents incorrect insertion into the CPU slot. A protective cover shields the battery compartment from dust and accidental contact. The module’s small footprint allows installation even in densely populated racks. Moreover, the gold-plated contacts ensure reliable electrical connections over many insertion cycles.
Operational Benefits and System Performance
The Siemens 6ES5375-8LA12 significantly reduces program load times compared to earlier EPROM-based alternatives. Users can modify program logic directly in RAM without erasing or reprogramming memory chips. This flexibility accelerates commissioning and troubleshooting processes considerably. The module also stores system diagnostics data, which aids in fault analysis after unexpected events. Consequently, this memory solution enhances overall system maintainability and uptime.
Compatibility and Ordering Information
This memory submodule fits all S5-95U, S5-100U, and S5-115U CPU models with a standard memory interface. You must verify that your CPU firmware version supports 64 KB addressing before installation. The package includes the memory module, a pre-installed lithium battery, and an instruction leaflet. For extended retention periods, consider ordering spare batteries separately. Always handle the module with electrostatic discharge (ESD) precautions during installation.