Allen Bradley 1747-L20C SLC 500 Fixed Controller (Processor)

FAQ

Q1: What type of device is the 1747‑L20C?
It is a fixed style processor/controller in the Allen‑Bradley SLC 500 series with built‑in inputs and outputs.

Q2: How many discrete inputs and outputs does it have?
It has 12 sink‑type 24 V DC inputs and 8 AC/DC relay outputs.

Q3: What is the memory and processing capability?
It offers 1 K instruction capacity with capacitor‑backed RAM, and typical bit execution is ~4 µs and ~8 ms/1 K scan time.

Q4: What power supply voltage does the controller use?
It operates from 85–265 VAC (typically 120/240 VAC) at 47–63 Hz.

Q5: Does it support high‑speed counting?
Yes — high‑speed counter inputs are supported.

Q6: What communication interface is built into it?
It has a DH‑485 communication port for slave mode remote access.

Q7: What are the physical size and weight?
Approximate dimensions are 145 × 35 × 131 mm (5.72 × 1.37 × 5.15 in), and weight is about 1.36 kg (3.00 lbs).

Q8: Is the 1747‑L20C still actively produced?
No, it is discontinued and considered a legacy SLC 500 controller.

1747-L20C Allen Bradley

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