The Siemens 6ES59437UB11 CPU module is the 943B central processor for the SIMATIC S5-115U family, delivering 48 KB of RAM and a single serial interface for device communication. Identified by the order number 6ES5-943-7UB11, this CPU is designed for S5-115U rack configurations and acts as the execution brain of the controller. Common applications involve legacy Siemens S5 automation setups where the 943B CPU provides CPU-level processing for control tasks and compatibility with the S5-115U I/O ecosystem.
