The Siemens 6ES5374-2FM21 memory card provides secure program and data storage for SIMATIC S5 programmable controllers. This compact module retains user programs and system parameters during power outages. Its sturdy casing measures 54 mm in height, 30 mm in width, and 8 mm in depth.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Siemens |
| Model | 6ES5374-2FM21 |
| Category | Memory Card / EPROM Module |
| Memory Type | EEPROM (electrically erasable) |
| Memory Capacity | 128 KB |
| Data Retention | > 10 years (without power) |
| Write Cycles | 10,000 (minimum) |
| Operating Voltage | 5 V DC (via CPU slot) |
| Power Consumption | 0.5 W |
| Access Time | 150 ns |
| Compatibility | SIMATIC S5 CPUs (series 115U, 135U, 155U) |
| Dimensions (H×W×D) | 54 × 30 × 8 mm |
| Weight | 0.04 kg |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | –25°C to +85°C |
| Protection Rating | IP20 |
| Component Count | 6 (integrated circuits) |
| Packaging | Anti-static tray |
Memory Architecture and Storage Capacity
The Siemens 6ES5374-2FM21 offers 128 KB of EEPROM storage for user programs and configuration data. This capacity accommodates medium-sized control applications with multiple function blocks. The memory retains all stored content without an external battery or backup source. Users can write and erase data for up to 10,000 cycles during development and maintenance.
Data Retention and Long-Term Reliability
This memory card retains stored data for over ten years without any external power supply. Such long retention eliminates concerns about program loss during extended plant shutdowns. The EEPROM technology provides non-volatile storage that requires no periodic battery replacement. This reliability ensures the controller remains ready to operate after long idle periods.
CPU Compatibility and System Integration
The Siemens 6ES5374-2FM21 works with S5 CPUs in the 115U, 135U, and 155U series. Users insert the card directly into the designated memory slot on the CPU module. The processor automatically recognizes the card and loads the program upon startup. This plug-and-play compatibility reduces installation time and simplifies field replacements.
Access Performance and Operating Speed
The module delivers fast access times of 150 ns for rapid program execution. This speed ensures the CPU retrieves instructions without introducing processing delays. The memory interface operates at 5 V DC supplied directly by the CPU slot. Such performance supports time-sensitive control tasks like high-speed counting and positioning.
Physical Design and Component Quality
This PCB contains six integrated circuits arranged in a compact layout for reliability. The card uses surface-mount technology to minimize size and weight effectively. A protective coating on the PCB shields the circuitry from dust and handling damage. The anti-static packaging preserves the module during transport and storage.
Installation and Handling Instructions
Insert the Siemens 6ES5374-2FM21 into the CPU memory slot with the label facing upward. Press the card firmly until the locking mechanism engages securely. Avoid touching the gold-plated edge connectors to prevent contamination. Remove the card by pressing the ejector tabs on the sides of the module.
Details
| Weight | 0.5 kg |
|---|---|
| Dimensions | 250 × 25 × 210 mm |
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