This is a brand new, factory-sealed Allen-Bradley 1747-L551 SER C SLC500 5/05 CPU Processor Unit Module PLC. It is a high-quality PLC processor module that is perfect for industrial automation and motion controls. The controller platform is SLC 500, which makes it easy to integrate into your existing system. The model is made to last, and it is designed to provide reliable performance even in tough industrial environments. This PLC processor module is ideal for use in a wide range of applications, and it is an excellent choice for businesses that need a reliable and high-performance automation solution.