Allen Bradley 1747-L553 SLC 500 Modular Processor (CPU)

FAQ

Q1: What is the 1747‑L553?
It is a modular CPU processor used in Allen‑Bradley SLC 500 programmable controller systems.

Q2: Which processor series does it belong to?
It belongs to the SLC 5/05 series of processors.

Q3: What is the memory size of the 1747‑L553?
It provides 64 K words of user program memory.

Q4: What communication interfaces does this CPU support?
It supports DH‑485 and RS‑232 (DF1) communication interfaces for networking and programming.

Q5: How performant is the processor?
The 1747‑L553 has a typical program scan time of ~0.25 ms per 1 K instructions and ~0.2 µs bit execution time.

Q6: How many I/O points can this processor manage?
It can manage up to 4096 discrete inputs and outputs depending on system setup.

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

Q8: Is the 1747‑L553 still produced by Rockwell Automation?
No — it is a discontinued legacy SLC 500 processor.

1747-L553 Allen Bradley

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