Allen-Bradley 1747-L531 SLC 500 Processor Module

The Allen-Bradley 1747-L531 SLC 5/03 Processor Module is the modular CPU for the SLC 500 family, designed for dependable machine control in compact automation projects. In a typical SLC 500 backplane, the L531 supports up to three local I/O chassis and as many as 30 I/O module slots, enabling scalable configurations while using Rockwell's RSLogix 500 programming environment. Communication options include a DH-485 network port and an RS-232 serial port for programming and data exchange with devices such as HMIs or other controllers; the unit employs Flash-based backup memory and ships with battery-backed RAM as standard to preserve runtime data during power loss. This processor is commonly used for simple automation tasks such as motor control, sequencing, and basic process control in lines and machines that rely on 1747 I/O modules, offering familiar, cost-effective performance within established SLC 500 installations.