Allen-Bradley 1747-L531 SLC 5/03 Processor is a compact, modular CPU for the SLC 500 family, designed to handle small- to mid-size control tasks in a 1747 I/O chassis. It provides 8K of user memory and runs 1747-OS302 Series C firmware with FRN 5, FRN 6, or FRN 7 for stable operation. The module exposes DH-485 and RS-232 serial communications to support standard SLC 500 networks and programming interfaces, and it draws 500 mA from a 5 V backplane (175 mA at 24 V). This processor is identified by the 1747-L531 designation within the SLC 500 lineup and is compatible with the broader 1747 family of CPUs.
