Siemens 6ES5375-1LA21 16KB CMOS-EPROM Memory Submodule

Product Description

Reliable Program Storage for Legacy SIMATIC S5 Systems

The Siemens 6ES5375-1LA21 is a specialized CMOS-EPROM memory submodule belonging to the legacy SIMATIC S5 controller family. This module provides 16 KB of non-volatile storage capacity, specifically engineered to hold user programs, system parameters, and configuration data for S5-series PLCs. As a CMOS-EPROM (Electrically Programmable Read-Only Memory), it offers the advantage of low power consumption while ensuring that critical automation logic is preserved even during total power loss or battery failure. This component is essential for engineers maintaining existing infrastructure where high-speed program execution and data permanence are required.

Support for Industrial Life Cycle Management

Although Siemens officially discontinued the SIMATIC S5 series in the 1990s, the 6ES5375-1LA21 remains a vital spare part for industries that continue to rely on these robust controllers. The module serves as a 375-type submodule, plugging directly into the dedicated memory slot of the S5 CPU. It is designed to withstand the electrical noise and thermal variations typical of older industrial control cabinets. Due to its EPROM architecture, the module requires an ultraviolet (UV) erasing lamp and a compatible Siemens S5 programming unit (such as a PG-740 or similar) for code modification, providing a secure, "write-protected" environment for finalized machine logic.

Detailed Technical Specifications

The table below details the technical and mechanical parameters for the 6ES5375-1LA21.