Siemens 6ES5375-8LC21 Memory Submodule

High-Capacity Data Storage for S5-115U CPUs

The Siemens 6ES5375-8LC21 memory submodule provides substantial storage expansion for S5-115U programmable controllers. This module accommodates large user programs, extensive data tables, and complex control algorithms. Advanced automation applications demand significant memory resources, and this unit fulfills that requirement completely.

Memory Architecture and Technical Specifications

This memory submodule utilizes high-speed CMOS RAM with a replaceable lithium battery for data retention. The module offers 64 kilobytes of total storage, partitioned into 32 kilobytes for program code and 32 kilobytes for data blocks. An integrated memory management unit handles address decoding and bank switching automatically. Furthermore, the battery provides a minimum retention period of 200 days under unpowered conditions.

Battery Backup System and Data Integrity

The integrated lithium battery automatically sustains memory contents during power interruptions. This battery provides early warning through a front-panel LED approximately 25 days before depletion. Users can replace the battery without losing stored data by following the prescribed procedure. The module also performs automatic parity checking on all memory locations during each read cycle. Additionally, a write-protect switch prevents accidental program modifications during normal operation.

Physical Design and Installation Details

The Siemens 6ES5375-8LC21 features a compact 40 mm by 60 mm form factor with a gold-plated edge connector. The module weighs only 90 grams, minimizing mechanical stress on the CPU socket. A protective cover shields the battery compartment from dust and accidental contact. The keyed connector design ensures correct orientation during installation. This module fits into the dedicated memory slot on compatible S5 CPUs.

Operational Benefits and Application Scenarios

This memory submodule supports complex automation tasks, including multi-axis motion control and batch processing. Users can store multiple machine recipes and call them instantly through program selection. The module also holds comprehensive diagnostic logs for predictive maintenance programs. Consequently, this memory solution enhances system capabilities without requiring a full CPU upgrade.

Compatibility and Ordering Information

This memory submodule works with all S5-115U CPUs featuring 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 installation instructions. For extended data retention, consider ordering spare batteries and replacing them every two years. Always handle the module with proper ESD precautions to avoid internal damage.