Allen Bradley 1747-L542 SLC 500 Modular Processor (CPU)

FAQ

Q1: What is the 1747‑L542?
It is a modular CPU processor used in Allen‑Bradley SLC 500 systems to run ladder logic and control I/O.

Q2: Which processor family does the 1747‑L542 belong to?
It is part of the SLC 5/04 series of processors.

Q3: What memory capacity does this processor provide?
It offers 32 K words of user program memory.

Q4: What communication interfaces are available on the 1747‑L542?
It includes DH‑485 and RS‑232 communication ports.

Q5: How fast does the processor operate?
Typical scan time is around ~0.6 ms per 1 K instructions with a ~0.6 µs bit execution time.

Q6: How many I/O points can this CPU support?
It supports up to 4096 discrete inputs and outputs depending on system configuration.

Q7: What are the physical dimensions and weight of the module?
Dimensions are approximately 5.5 × 1.37 × 5.15 in, and the weight is about 0.32 kg.

Q8: Is the 1747‑L542 still available as new hardware?
No — it is a discontinued legacy processor from the SLC 500 series.

1747-L542 Allen Bradley

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