The ABB 07KR51-A3.6 is a central processing unit (CPU) module designed specifically for the ABB Advant Controller 110 (AC 110) PLC system. As the core component of the controller, this processor board is responsible for executing control logic, managing system tasks, and handling communication within the Advant OCS (Open Control System). It is a critical component for maintaining the operational integrity of existing industrial automation systems, ensuring reliable performance for process control applications. This module is often identified by the alternative part number GJR5250000R0306.