Allen-Bradley 1756-L61 ControlLogix Processor

The Allen-Bradley 1756-L61 ControlLogix Processor (Logix5561) is a high‑capacity ControlLogix CPU with 2 MB of user memory and a compact 0.71 lb package designed for large, multi‑I/O automation systems. It provides a built‑in RS‑232 serial port for programming and diagnostics and supports optional nonvolatile data backup via a CompactFlash card (1784-CF128). The L61 delivers fast logic execution with program scan times down to 0.08 ms and supports up to 32 tasks with up to 100 programs per task. As part of the 5561 family, it interfaces with EtherNet/IP, ControlNet, and DeviceNet networks through compatible modules, enabling scalable, integrated control across distributed I/O and motion applications.