Siemens 6ES7954-8LF02-0AA0 Memory Card

This memory card provides program and data storage for SIMATIC S7-300 and S7-400 programmable controllers. It replaces the earlier flash EPROM and RAM cards with a higher-capacity, more reliable solution. The card holds user programs, hardware configurations, and data logs for the automation system.

Storage Capacity and Memory Architecture

The Siemens 6ES7954-8LF02-0AA0 features a generous 2 MB of flash memory for storing user programs and system data. It serves as the load memory for the CPU, enabling program transfer without a programming device. The card also functions as a data log for storing process values and diagnostic data. A built-in write protection switch prevents accidental overwriting of critical program data.

Technical Specifications

Specification	Detail
Model	6ES7954-8LF02-0AA0
Product Type	SIMATIC S7 Memory Card
System Compatibility	S7-300, S7-400, C7, ET 200
Memory Type	Flash (FEPROM)
Memory Size	2 MB
Function	Load memory, Program storage, Data logging
Write Protection	Yes (mechanical switch)
Data Retention	Over 10 years
Write Cycles	> 100,000
Dimensions	Standard memory card form factor
Weight	Approx. 0.02 kg
Operating Temperature	0°C to +60°C
Storage Temperature	-40°C to +85°C
Humidity	5% to 95% non-condensing
Certifications	CE, UL

Program Transfer and System Integration

The memory card acts as the load memory, eliminating the need for a programming device. Users can load a program onto the card using a PC with a programming adapter. Once inserted, the CPU reads the program from the card during startup. This feature enables simple program replacement for system upgrades. The card also stores data logs for process values and diagnostic events.

Application Use

System integrators and maintenance engineers use this card for program transport and backup. It provides a convenient way to transfer programs between engineering stations and CPUs. The card’s flash technology ensures data retention even during long power outages. Its compact size makes it easy to store and transport between different plant locations. The card serves chemical plants, power generation, and manufacturing facilities.