The Allen-Bradley 1747-L553 is a powerful CPU module from the Allen-Bradley SLC 500 and SLC 5/05 Programmable Logic Controller (PLC) series. This central processing unit (CPU) features built-in CMOS RAM with battery backup and supports the Allen-Bradley 1747-M13 memory module, providing an additional 64K of memory for enhanced data and program storage. The 1747-L553 CPU includes an Ethernet channel and multi-protocol communication ports such as RS-232, DH-485, DF1, and ASCII, ensuring flexible and reliable connectivity. Capable of managing up to 64 simultaneous connections, this high-performance processor enables efficient communication with multiple devices and applications. The Allen-Bradley 1747-L553 delivers robust processing power, advanced networking, and dependable operation for industrial automation and process control systems.