Siemens 6ES5377-0AA11 Memory Submodule for SIMATIC S5

Core Data Storage for Classic S5 Systems

The Siemens 6ES5377-0AA11 is a memory submodule for the SIMATIC S5 programmable logic controller family. This module provides non-volatile program and data storage for critical automation tasks. It fits directly into the CPU or dedicated memory slot of S5-115U, S5-154U, and S5-155U systems. Consequently, it ensures reliable program retention even during extended power outages.

EPROM Technology and Data Integrity

This submodule utilizes EPROM (Erasable Programmable Read-Only Memory) technology for permanent data storage. It retains programs without requiring battery backup, eliminating the risk of data loss from battery failure. The 6ES5377-0AA11 offers 32 KB of storage capacity for core control logic and fixed recipes. Furthermore, its design prevents accidental or unauthorized program modifications in the field.

Technical Specifications and Physical Details

Engineers designed this module for straightforward installation inside the S5 CPU compartment. Its compact form factor requires minimal space within the control cabinet. The following table details its primary functional and physical parameters.

Application in Legacy System Support

Plant engineers use this module to store and protect critical programs in aging S5-controlled production lines. It is especially valuable in industries like food processing, packaging, and water treatment where system stability is paramount. The Siemens 6ES5377-0AA11 enables continued operation of reliable legacy equipment without costly full-system upgrades. Therefore, sourcing tested units is crucial for lifecycle management of classic Siemens automation platforms.