Siemens 6ES5 102-8MA02 Programmable Logic Controller Module

Siemens 6ES5 102-8MA02 is the CPU102 central processing unit for the SIMATIC S5-100U family, serving as the processing core that runs the PLC program and coordinates data flow between the control logic and connected I/O modules in legacy Siemens automation systems. This plug-in processor is designed for 24 V DC operation, typically drawing about 1 A during normal operation, and is identified by the 6ES5 102-8MA02 part number for ordering and maintenance. As part of the S5-100U ecosystem, the CPU102 integrates with a modular rack architecture for compact control of industrial processes, with the S5 platform historically used across manufacturing lines, packaging equipment, and machine tools. The 102 designation places it within Siemens’ CPU lineup for S5-100U controllers and ensures compatibility with the corresponding base frame, I/O interfaces, and programming tools used to configure and diagnose legacy installations. Given its age, this module is designed as a practical replacement or spare part in older systems and maintains the rugged, industrial build typical of the S5 era while delivering reliable control in appropriate retrofits or preserved facilities.