Description
The Siemens 6ES5374-2FM21 is a specialized memory module engineered for the Simatic S5 PLC series. This non-volatile memory card is designed to provide reliable, long-term storage for user programs and system configurations, ensuring that critical control logic remains intact even during power-loss events. It serves as a vital component for maintaining uptime in legacy automation environments where data stability and rapid recovery are essential.
Features
- Non-volatile storage technology ensures program retention without the need for battery backup.
- Robust architecture designed for integration with Simatic S5 CPU memory slots.
- High-durability edge connectors to resist oxidation and contact failure in industrial atmospheres.
- Integrated write-protection mechanisms to prevent unintended data modification during system faults or EMI surges.
- Solid-state design with no moving parts, enhancing reliability in high-vibration control cabinet environments.
Applications
This memory module is intended for use in industrial control systems requiring stable, long-term storage for PLC logic. It is widely utilized in legacy manufacturing, energy management, and material handling systems that rely on the Siemens S5 platform for continuous operation.
Technical Specifications
| Model |
6ES5 374-2FM21 |
| Memory Type |
Flash EPROM / EEPROM |
| Operating Voltage |
5 VDC (via CPU interface) |
| Data Retention |
Minimum 10 years at 55 deg C |
| Operating Temperature |
0 deg C to 60 deg C |
| Storage Temperature |
-40 deg C to 70 deg C |
| Relative Humidity |
95% non-condensing |
Installation Guidelines
- Ensure the CPU is powered down before inserting or removing the memory card to prevent electrical arcing or data corruption.
- Handle the module by the edges; avoid touching the gold-plated contact pins to prevent oil or debris contamination.
- Verify that the card is fully seated in the CPU memory slot to ensure proper bus connection.
- Keep the module away from high-EMC sources and ensure the control cabinet environment is free from excessive conductive dust.
- Always back up your program data to a secondary source before performing maintenance or module replacement.
FAQ
Does this module require a battery? No, this is a non-volatile flash-based memory card and does not require battery buffering to retain data.
Is this card compatible with all S5 CPUs? This card is designed for specific Simatic S5 systems. Please verify your CPU's hardware manual to confirm compatibility with the 6ES5 374-2FM21 order code.
