Allen-Bradley 1756-L1 ControlLogix Processor Unit with a 1756-M3 memory module is a Logix5550-based CPU designed for ControlLogix racks. In this configuration, the L1 processor pairs with the 1756-M3 memory module to provide up to 2 MB of user memory (160 KB to 2 MB range) for programs and data. This memory expansion reflects the modular memory architecture of 1756-L1 controllers and is compatible with other memory options (M1, M2, M3) across the family. It is typically used to run larger ladder logic programs and manage more data in mid-to-large automation projects requiring reliable, scalable processing.
