Siemens 6ES5340-3KB11 Programmable Logic Controller Module

Siemens 6ES5340-3KB11 is a SIMATIC S5 340 memory module in the compact RAM version, delivering 16 KB of RAM to augment the memory capacity of S5-130 and S5-150 central controllers. This module is designed for installation in legacy Siemens S5 automation systems that rely on the 340 memory block for program and data storage, and is cataloged under 6ES5340-3KB11 (also listed as 6ES53403KB11). With 16 KB of RAM, it supports modestly larger PLC programs and increased data logging within the S5-130/150 platform, enabling maintenance and retrofit projects without replacing the entire CPU. The 340 memory module comes as a compact RAM expansion solution, useful in retrofits, spare-part stocking, and service of aging production lines where Siemens S5 control hardware remains in operation. Typical applications include machine control in manufacturing environments, packaging lines, and process equipment previously configured around the S5-130/150 controllers. This module forms part of the SIMATIC S5 family’s memory extension options, allowing engineers to preserve existing control logic while expanding available working memory to accommodate evolving logic and data requirements.