Siemens 6ES5340-5AB31 RAM Memory Module for SIMATIC S5

Core Memory Expansion for S5 Systems

The Siemens 6ES5340-5AB31 is a 48 KB RAM memory module for the SIMATIC S5 programmable logic controller family . This module provides additional volatile memory for storing user programs, data blocks, and system parameters during operation. It expands the memory capacity of the CPU, enabling more complex control logic and larger data sets in industrial applications .

Memory Function and System Application

This RAM module serves as temporary storage for active program execution. It requires a power supply to retain its data, but typical S5 systems include battery backup to preserve memory content during power outages . The 6ES5340-5AB31 is used in S5 systems with a CPU that supports memory expansion. It installs directly into a dedicated slot on the CPU module or a memory expansion board. Furthermore, it provides the working memory needed for modern, structured programming using STEP 5 software .

Technical Specifications and Compatibility

This memory module is a standard component for the SIMATIC S5 platform and is widely available from various automation suppliers. The following table details its key functional and identification parameters:

Application in Legacy S5 Support

Plant engineers use this RAM module to maintain and support existing SIMATIC S5-based production lines. It is essential for system lifecycle management in industries like manufacturing, automotive, and utilities where legacy S5 controllers remain in operation. The Siemens 6ES5340-5AB31 ensures continued operation of proven legacy equipment by providing the necessary working memory for existing programs. Therefore, sourcing tested units from specialized suppliers is crucial for the lifecycle management of classic Siemens automation platforms.