Allen-Bradley 8520CPUX1 CPU Module

Allen-Bradley 8520-CPUX1 CPU Module, often written as 8520CPUX1, is the central processing unit for Allen-Bradley 9-series CNC controllers, serving as the brains of the 8520 CNC system by executing control programs, coordinating motion commands, and managing I/O communications. Available in revisions such as 8520-CPUX1B (Serial B), it is documented and stocked by multiple suppliers as part of the AB 8520 CNC controller ecosystem. Inside, memory is provided by RAM and Flash SIMMs, with Flash memory mounted on the lower half of the CPU module to hold firmware and CNC program data. The module is designed to be installed in standard AB 8520 controller racks and is typically used in conjunction with other 8520 I/O and adapter modules to form a complete CNC control system. An adapter option, 176059, exists for compatibility with older 8500 processor configurations, illustrating AB's cross-era compatibility within CNC hardware.