Siemens 6ES5340-5AA21 Memory Module

Reliable Data Storage for SIMATIC S5 Systems

The Siemens 6ES5340-5AA21 memory module expands the data storage capacity of SIMATIC S5 programmable logic controllers. This unit stores user programs, fixed data, or system configuration parameters . Programmers and maintenance engineers rely on this module for dependable non-volatile storage in legacy S5 systems.

Memory Capacity and Technology

This memory module offers a storage capacity of 32 kilobytes, providing ample space for complex control programs . The unit uses RAM technology, which requires a battery backup to retain data during power loss. Users can store user programs, data blocks, and system configurations for stable automation operations . Furthermore, the module integrates seamlessly with the S5 backplane bus for straightforward data access.

Parameter	Specification
Brand	Siemens
Model	6ES5340-5AA21
Product Type	Memory Module
System Compatibility	SIMATIC S5 Series
Memory Capacity	32 KB
Memory Technology	RAM (battery-backed)
Weight	0.37 kg
Dimensions	19.0 cm x 3.0 cm x 25.0 cm

System Integration and Addressing

The Siemens 6ES5340-5AA21 plugs directly into the CPU module’s memory slot or an expansion rack . The module communicates with the CPU through the backplane bus without additional drivers or configuration . You can access the stored data through the STEP 5 programming software for reading and writing operations. Moreover, the module works with S5-115U, S5-135U, and S5-155U CPU models .

Operational Characteristics and Data Retention

This memory module stores user programs, process parameters, and system configuration data. The RAM technology requires a battery backup to maintain data during power outages. Users can modify the program content online when the module uses RAM storage . Consequently, this flexibility simplifies program modifications and debugging processes significantly.

Compatibility and Application Areas

This memory module supports S5-115U, S5-135U, and S5-155U PLC systems . Users can employ this module for program storage expansion, process data backup, and multi-version program management . The module serves primarily for maintaining existing S5 systems rather than new installations. Always verify your CPU supports 32 KB addressing before installation.