Non-Volatile Program Storage
The SC 8256 functions as a non-volatile memory module for Schneider Electric automation controllers. This plug-in unit stores user programs, configuration data, and application parameters securely. It provides battery-backed RAM for active program execution and retention. The module also includes EEPROM for permanent backup without battery dependency. Consequently, it preserves critical system data during power outages or controller maintenance.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Schneider Electric |
| Model | SC 8256 |
| Category | Memory Module |
| Memory Type | Battery-backed RAM + EEPROM |
| RAM Capacity | 256 KB |
| EEPROM Capacity | 64 KB (non-volatile backup) |
| Battery Type | Lithium coin cell (replaceable) |
| Battery Life | 5 years (typical) |
| Data Retention | 10 years (EEPROM, no battery) |
| Interface | Direct plug-in (controller backplane) |
| Read/Write Speed | 15 µs (typical access time) |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Dimensions | 7.5 cm x 5.0 cm x 2.0 cm |
| Weight | 0.12 kg |
| Write Cycles Endurance | 100,000 (EEPROM) |
| Mounting | Socketed (removable) |
| Indicators | LED (battery low warning) |
Data Integrity Features
The SC 8256 employs multiple safeguards to protect stored application data. The module automatically transfers RAM contents to EEPROM upon power-down detection. This ensures program retention even if the battery fails unexpectedly. A lithium battery maintains RAM integrity during extended power-down periods. Moreover, the memory module includes CRC checksum verification for data integrity. These features provide peace of mind for critical process applications.
Compatibility and Integration
This memory module plugs directly into designated slots on Schneider controllers. The SC 8256 supports program backup, storage, and transfer between systems. Users can store multiple application versions and recover previous configurations easily. The module simplifies field upgrades by allowing pre-programmed memory swaps.
Application Context
This memory module suits applications requiring reliable program retention and backup. The SC 8256 is commonly used in manufacturing, process control, and material handling systems. It eliminates reprogramming after power cycles and enhances system availability.
Details
| Weight | 0.91 kg |
|---|---|
| Dimensions | 110 × 55 × 90 mm |
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