Siemens 6ES5340-3KB421 Memory Module is a compact RAM module for SIMATIC S5 340 memory systems, delivering 64 KB of RAM in a small plug‑in package. It is part of the 6ES5340-3KB family and is used to replace or expand RAM in older S5-340 controllers to support larger programs and data handling. The compact design and 64 KB RAM capacity suit retrofits and maintenance of legacy Siemens automation, enabling more efficient operation of aging processes. Typical applications include industrial control setups utilizing SIMATIC S5-340 CPUs where additional RAM improves program size capacity and runtime performance.
