Allen Bradley 1747-L551 SLC 500 Modular Processor (CPU)

FAQ

Q1: What is the 1747‑L551?
It is a high‑performance modular CPU processor for the Allen‑Bradley SLC 500 system.

Q2: Which processor series does the 1747‑L551 belong to?
It belongs to the SLC 5/05 processor family.

Q3: How much memory does the 1747‑L551 have?
It provides 64 K words of user program memory.

Q4: What communication interfaces does this processor include?
It has DH‑485 and RS‑232 ports supporting standard industrial communication protocols.

Q5: How fast is the processor performance?
Typical program scan time is about ~0.25 ms per 1 K instructions with ~0.2 µs bit execution for fast control.

Q6: What I/O capacity can it support?
It can support up to 4096 discrete inputs and outputs depending on system configuration.

Q7: What are the physical size and weight?
Dimensions are about 5.5 × 1.37 × 5.15 in and weight is around 0.32 kg.

Q8: Is the 1747‑L551 still in production?
No — it is a discontinued CPU from the legacy SLC 500 product line.

1747-L551 Allen Bradley

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