• Siemens 6ES5374-2FM21
  • Siemens 6ES5374-2FM21
  • Siemens 6ES5374-2FM21
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Siemens 6ES5374-2FM21 Simatic S5 PLC Memory Card

Siemens 6ES5374-2FM21 Simatic S5 PLC Memory Card

Description

The Siemens 6ES5 374-2FM21 is a ruggedized solid-state memory module designed for the legacy Simatic S5 programmable logic controller platform. This industrial-grade EPROM card provides non-volatile storage for CPU user...

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SKU: 6ES5374-2FM21
Vendor: Siemens
Category: PLC Memory Module
Related Series:

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Description

The Siemens 6ES5 374-2FM21 is a ruggedized solid-state memory module designed for the legacy Simatic S5 programmable logic controller platform. This industrial-grade EPROM card provides non-volatile storage for CPU user programs, system parameters, and critical logic configuration data. It is engineered for continuous-operation infrastructure, including petroleum refining, chemical processing, and heavy manufacturing, where reliable data retention is required during power anomalies.

Features

  • Non-volatile storage ensures absolute data retention without the need for battery buffering.
  • Hardwired write-protection sub-circuits prevent accidental data corruption during high electromagnetic interference (EMI) events or CPU fault states.
  • Gold-plated edge connectors provide low contact resistance and enhanced durability in corrosive industrial environments.
  • Passive architecture with no moving parts or volatile components, ensuring long-term reliability.
  • Optimized for rapid parallel read access across the S5 backplane bus.

Technical Specifications

Model 6ES5 374-2FM21
Brand Siemens
Series Simatic S5
Memory Type Flash EPROM / EEPROM
Data Retention 10 years minimum at 55 deg C
Operating Voltage 5 VDC (via CPU slot)
Operating Temperature 0 to 60 deg C
Storage Temperature -40 to 70 deg C
Relative Humidity 95% non-condensing

Installation Guidelines

  • Ensure the PLC CPU is powered down before inserting or removing the memory card to prevent electrical arcing or data corruption.
  • Handle the module by the edges to avoid electrostatic discharge (ESD) damage to the internal circuitry.
  • Ensure the gold-plated edge connector is clean and free of debris before seating the card into the CPU memory slot.
  • Verify that the card is fully seated and locked into the slot to maintain consistent contact during vibration.
  • Avoid installing the module in areas with extreme moisture or direct exposure to corrosive chemicals unless housed in an appropriate NEMA-rated enclosure.

FAQ

Does this memory card require a battery? No, this is a non-volatile Flash EPROM module that retains data without the need for battery buffering.

Is this module compatible with all Simatic S5 CPUs? This module is designed for the Simatic S5 series. Please verify your specific CPU model's documentation to ensure compatibility with the 6ES5 374-2FM21 memory card.

How do I protect the program from being overwritten? The module features hardwired write-protection circuitry to prevent accidental overwriting during operation.