Siemens 6ES5374-2KL21 2 MB Flash EPROM Memory Card

Product Overview

The Siemens 6ES5374-2KL21 is a long-format Flash EPROM memory card in the SIMATIC S5 range. It provides 2 MB of non-volatile storage for S5 control applications, keeping its stored contents without continuous power. This is a 5 V-only card: Siemens specifies 5 V for both reading and writing. The Siemens ST 50 catalog lists this exact order number among the Flash EPROM memory cards for CPU 948 and the S5-155H CPU 948R/RL family. Its defining details are the storage capacity, memory technology and long-card format—not an I/O channel count or communications interface. 

Technical Specifications

Key Features & Model Benefits

- 2 MB Flash EPROM: Provides non-volatile storage for S5 program or application data.
- 5 V-only technology: Uses 5 V for both read and write operations.
- Long-format memory card: Matches the form identified for this order number in Siemens documentation.
- Documented S5 applications: Listed by Siemens for CPU 948 and S5-155H CPU 948R/RL configurations.

Frequently Asked Questions

Q: What type of product is 6ES5374-2KL21?
A: It is a Siemens SIMATIC S5 long-format Flash EPROM memory card.
Q: How much storage does 6ES5374-2KL21 provide?
A: Its specified memory capacity is 2 MB.
Q: What voltage does 6ES5374-2KL21 use for reading and writing?
A: Siemens identifies this as a 5 V-only Flash EPROM card, with 5 V read and write voltage.
Q: Which S5 controllers list 6ES5374-2KL21 as a memory-card option?
A: The Siemens ST 50 catalog lists it with CPU 948 and the S5-155H CPU 948R/RL family.

Industries Served

- Power Generation: Memory storage for SIMATIC S5 control systems in plant operations.
- Chemical Processing: Supports S5-based automation used in continuous processes.
- Manufacturing: Serves production equipment built around documented S5 controller configurations.
- Oil & Gas: Memory-card applications in facilities operating SIMATIC S5 controls.