The Siemens 6ES5374-2FM21 is a specialized memory sub-module engineered for the Simatic S5 PLC product line. This solid-state EPROM card provides reliable, non-volatile storage for user programs and system configuration data. Designed for demanding industrial environments, it ensures that critical control logic remains intact during power cycles or system resets, facilitating rapid recovery in automated control applications.
Features
Non-volatile storage technology prevents data loss during power outages.
Hardwired write-protection mechanisms to prevent accidental data corruption.
Gold-plated edge connectors for reliable contact and corrosion resistance.
Maintenance-free operation with no internal batteries required.
Optimized for direct integration with the S5 CPU backplane slot.
Applications
This memory card is primarily used in legacy Simatic S5 automation systems, including heavy manufacturing, chemical processing, and infrastructure control systems where long-term data retention is required for system programs and setpoints.
Technical Specifications
Model
6ES5 374-2FM21
Series
Simatic S5
Memory Type
Flash EPROM / EEPROM
Data Retention
10 years minimum at 55 deg C
Operating Voltage
5 VDC (via CPU interface)
Operating Temperature
0 to 60 deg C
Storage Temperature
-40 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 potential damage to the module or the controller backplane.
Handle the module by the edges to avoid ESD (Electrostatic Discharge) damage to the internal components.
Verify that the card is fully seated in the CPU memory slot to ensure proper electrical contact.
Keep the module away from high-EMI sources and ensure the control cabinet is properly grounded to maintain signal integrity.
Store in a dry, climate-controlled environment when not in use to maintain the longevity of the memory cells.
FAQ
Does this card require a backup battery? No, this is a non-volatile flash-based module that retains data without the need for battery buffering.
Is this module compatible with all S5 CPUs? This module is designed for the Simatic S5 series; however, please verify your specific CPU model's memory slot compatibility and memory capacity limits before installation.
