Siemens 6ES5095-8FA02 Internal Memory

Memory Expansion Solution for SIMATIC S5 Processors

The Siemens 6ES5095-8FA02 expands the internal memory capacity of SIMATIC S5 programmable controllers for larger programs. This module plugs directly into the processor’s memory slot, adding 16 KB of additional user memory. Its compact PCB measures 180 mm in length, 100 mm in width, and 20 mm in depth, fitting standard S5 CPU housings. The total weight reaches approximately 0.15 kg, making it one of the lightest memory upgrade options.

The module uses CMOS RAM technology with battery backup for reliable program retention during power outages. The following table details the complete technical specifications for this memory expansion solution:

Parameter	Specification
Product Brand	Siemens
Product Model	6ES5095-8FA02
Product Category	Internal Memory Module
Platform Compatibility	SIMATIC S5 (all CPU variants)
Memory Type	CMOS RAM with battery backup
Additional Memory	16 KB
Total Expandable Memory	Up to 48 KB (with multiple modules)
Battery Type	Lithium (3.6 V)
Battery Life	3 years typical
Dimensions (L x W x D)	180 mm x 100 mm x 20 mm
Weight	0.15 kg
Power Consumption	0.5 W typical
Data Retention Time	> 3 years (with battery)
Operating Temperature	0°C to +60°C
Storage Temperature	-40°C to +85°C

Memory Architecture and Program Expansion

The 6ES5095-8FA02 increases available user memory for more complex logic programs and data blocks. This 16 KB expansion complements the base memory of S5 processors, enabling larger program storage. Engineers can therefore implement advanced control strategies without upgrading the entire CPU. The module occupies a dedicated memory slot, preserving other expansion options for additional I/O.

Battery Backup and Data Integrity

A replaceable 3.6 V lithium battery maintains memory contents during main power loss or module removal. This battery provides over three years of data retention, ensuring program security across extended downtime. The module includes a low-battery warning signal for proactive replacement scheduling. This warning prevents unexpected data loss and reduces maintenance effort over time.

System Integration and Compatibility

The memory module integrates seamlessly with all SIMATIC S5 CPU variants, including 135U, 155U, and 95U series. Installation requires no configuration changes or software adjustments, simply plug-and-play operation. The module also supports memory expansion in systems with existing 8 KB or 16 KB modules. Users can therefore upgrade memory capacity in service without lengthy system modifications.