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Data Storage Overview
The Siemens 6ES7478-1AN00-0AA0 provides reliable data storage for the SIMATIC S7-400 programmable logic controller. This memory module expands the controller’s data storage capacity significantly. It stores recipes, logs, and other non-volatile data securely. Plant engineers use this module for extended data retention in critical applications.
Technical Specifications
The 6ES7478-1AN00-0AA0 measures 100 mm in height and 50 mm in width. Its compact design fits into the dedicated slot on the S7-400 CPU module. The module weighs approximately 0.15 kilograms. It operates on the 5V DC supply from the CPU with a current draw of 40 mA.
| Parameter | Specification |
|---|---|
| Model | 6ES7478-1AN00-0AA0 |
| Product Type | Memory Module |
| Dimensions | 100 mm x 50 mm x 22 mm (depth) |
| Weight | ~0.15 kg |
| Supply Voltage | 5V DC |
| Current Draw | 40 mA |
| Memory Type | EEPROM |
| Storage Capacity | 512 KB |
| Data Retention | Non-volatile, 10 years minimum |
| Write Cycles | 1,000,000 (minimum) |
| Slot Type | Dedicated CPU slot |
| Compatibility | S7-400 CPUs with memory expansion port |
| Data Types | DB blocks, SDB, recipes, logs |
| Interface | 2 x 16-pin connector |
| On-board Components | 1 x EEPROM chip, 1 x controller IC |
| Energy Storage | None required (non-volatile) |
| LED Indicators | None |
| Operating Temp. | 0°C to +60°C |
Memory Expansion Capabilities
This module expands the S7-400 CPU’s data storage by 512 KB of non-volatile memory. It stores data blocks, recipes, and system information reliably. The EEPROM technology retains data for a minimum of 10 years without power. The 1,000,000 write cycles ensure long-term durability. The memory module provides a practical solution for data-heavy applications.
Data Integrity and Security
The Siemens 6ES7478-1AN00-0AA0 ensures data integrity through EEPROM’s inherent stability. It stores all data in a protected memory area. Power failures do not compromise stored information. The memory module supports online backup and restore functions. Data can be transferred between similar systems easily.
Installation and System Integration
Installing the 6ES7478-1AN00-0AA0 requires inserting it into the CPU’s dedicated slot. The module clicks into place without tools. The CPU automatically detects the memory module during startup. Configuration occurs through STEP 7 or TIA Portal software. The module operates reliably between 0°C and 60°C ambient temperatures.
Reliability and Maintenance
The Siemens 6ES7478-1AN00-0AA0 provides maintenance-free memory expansion. The EEPROM technology eliminates battery replacement concerns. Regular monitoring of CPU status confirms proper operation. Memory utilization is visible through the programming software.