Siemens 6ES5 900-7AB11 CPU Module

Siemens 6ES5900-7AB11 is the CPU module for the SIMATIC S5-110 family (often listed as 6ES5 900-7AB11, 6ES5-9007AB11), designed to slot into an S5-110 backplane to control the S5-110A controller. The unit is documented as the central processing unit for S5-110 installations and provides one slot for a 910 memory submodule, enabling basic program and data storage within the system. This specific part number is commonly sold as a replacement CPU for legacy Siemens S5 systems and is referenced across multiple catalog listings under variations of the model number, including 6ES5-900-7AB11 and 6ES5900-7AB11. Typical use cases include service, repair, and ongoing operation of aging S5-110 automation lines where compatibility with the S5-110 backplane and memory submodules is required.