ControlLogix 5550 Processor CPU | Allen-Bradley 1756-L1 /A

Product Description

The Allen-Bradley 1756-L1 /A is the foundational central processing unit (CPU) for the ControlLogix® 5550 system. As the pioneering controller of the Logix family, it introduced a multi-discipline control engine capable of managing sequential, process, and discrete automation tasks within a single chassis. The 1756-L1 /A (Series A) utilizes a robust 32-bit architecture and is designed for modular scalability, allowing engineers to distribute control across multiple networks including EtherNet/IP, ControlNet, and DeviceNet via dedicated communication modules.

Equipped with an integrated RS-232 serial port, the 1756-L1 /A supports DF1 and ASCII protocols for programming and simple device integration. While categorized as a legacy product, it remains a vital component for maintaining existing industrial infrastructures that rely on its specific memory mapping and backplane performance. The module features a modular memory slot, allowing for field upgrades to program capacity using compatible memory expansion cards.

Technical Specifications

Detailed hardware parameters and operational limits for the 1756-L1 /A: