Allen-Bradley 1747-L524 SLC 500 Series Processor

The Allen-Bradley 1747-L524 is a SLC 500 modular processor (SLC 5/02) with 4K instructions of program memory, designed to drive larger discrete I/O configurations in legacy Allen‑Bradley automation systems. It installs in a 1747-series chassis and supports up to 4096 discrete inputs and 4096 discrete outputs, enabling expansive control schemes. The unit provides DH+ communications and an RS‑232 serial port for programming, and it supports DH‑485 networking for remote I/O connections. Programming is performed with RSLogix 500, the standard software for SLC 500 family controllers. Key performance figures include a typical scan time of 4.8 ms per 1K of program memory and a bit execution time of 2.4 µs for XIC logic, delivering responsive enough performance for mid‑scale automation tasks. Power is supplied at 5 V DC with a typical load around 90 mA, and there are memory backup options via 1747‑M1 or 1747‑M2 modules to preserve data during power interruptions. Overall, the 1747‑L524 represents a robust 4K‑memory, DH+/DH‑485 capable processor ideal for upgrading or maintaining mid‑life SLC 500 installations while preserving compatibility with a wide range of 1747 I/O modules and RSLogix 500 project files.