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Module Overview
This memory submodule expands the storage capacity of SIMATIC S5 CPUs. You can install Siemens 6ES5375-0LC21 directly into the memory slot of S5 processors. The unit stores user programs and system data reliably. It replaces older EPROM-based memory modules with modern EEPROM technology.
Technical Specifications
| Parameter | Value |
|---|---|
| Dimensions (W x H x D) | 45 mm x 20 mm x 10 mm |
| Weight | 0.02 kg (20 grams) |
| Memory type | EEPROM (Electrically Erasable) |
| Storage capacity | 8 KB (non-volatile) |
| Program steps | Approximately 2,000 steps of ladder logic |
| Supported CPUs | S5 95U, 100U, 115U, 135U, 155U |
| Write cycles | Minimum 10,000 erase/write operations |
| Data retention | 10 years minimum at 25°C |
| Access time | 250 ns typical |
| Operating voltage | 5V DC (from CPU backplane) |
| Power consumption | 50 mA maximum |
| Interface | 32-pin DIP (plug-in) |
| Total onboard components | 18 discrete parts |
| Energy storage type | No capacitors (non-volatile EEPROM) |
| Operating temperature | 0°C to +60°C |
Board Layout and Components
The PCB carries a single EEPROM chip at the center of the module. A standard 32-pin DIP connector provides the interface to the CPU. Additionally, 18 discrete components include decoupling capacitors and address logic. The design uses no batteries or super capacitors for data retention. Consequently, stored programs never need refreshing after power loss.
Installation Process
You can insert Siemens 6ES5375-0LC21 into the memory submodule slot of any S5 CPU. The module locks securely with built-in retaining clips. Furthermore, no external programming voltage is required for write operations. A small label area allows marking of module contents and revision.
Performance Advantages
This submodule retains program data for 10 years without any backup power. The 8 KB capacity stores approximately 2,000 ladder logic steps. Therefore, you can expand older S5 systems beyond their internal memory limits. The 10,000 write cycles also support frequent program updates during commissioning.
Safety and Compliance
Siemens 6ES5375-0LC21 meets CE and RoHS industrial standards. The unit stores no electrical energy that could create shock hazards. Hence, technicians can handle the module safely without discharge delays.