PSE-PM8DNRL, LANBAO, retro-reflective laser sensor, Sn 2–8 m, NPN, NO and NC, cable 2 m

PSE-PM8DNRL – Retro-reflective laser sensor with reflector

PSE-PM8DNRL (LANBAO) is a retro-reflective laser sensor with reflector. It works with a narrow laser beam reflected from the reflector, so it reliably detects even small objects and allows precise alignment over long distances.

Key features

• Sensing distance 2–8 m.
• NPN output, NO and NC contact (programmable) – connects to a PLC digital input or a relay coil.
• Supply 10–30 V DC.
• Connection: cable 2 m.

Technical specifications PSE-PM8DNRL

Wiring of PSE-PM8DNRL by wire colours

The colour coding complies with IEC 60947-5-2. Always compare the actual pin and wire assignment with the diagram in the sensor datasheet (Downloads tab).

Wiring of a four-wire cable with two outputs.

Typical applications

• detection of small parts where a standard LED beam is not narrow enough
• precise counting on a fast line
• position monitoring with high repeatability
• applications with long range and precise aiming
• detection of narrow edges and gaps

How to choose and what to watch out for

• NPN output (switches minus) is used mainly in Asian equipment and selected PLCs. For standard European inputs, the PNP variant is usually more suitable.
• NO and NC contact: the output logic can be selected by wiring, so one model covers both the normally open and normally closed function.
• Cable outlet: the cheaper variant, but replacing the sensor requires pulling the entire cable. If you need quick replacement, choose a model with a connector (suffix -E1 for M8, -E2 for M12).

PNP or NPN – and what happens if you mix them up

PNP switches the positive pole, so it sends plus to the PLC input. It is the European standard and matches standard digital inputs. NPN switches minus and is used mainly in Asian equipment. If mixed up, the sensor either does not switch at all or reports a permanently active state — it usually will not be damaged, but it will not work.

This model has a NPN. If you need PNP, a variant with the same sensing distance is available — contact us and we will recommend the code.

NO or NC – and why it is not just a matter of convenience

NO (normally open) is an output that is active on detection. NC (normally closed) is active at rest and opens on detection. The difference is a safety one: with NC, a broken wire causes the same reaction as a detection, so the fault shows up immediately. With NO, a broken cable remains unnoticed until someone tries to switch.

This model has the contact NO and NC (programmable).

Similar models in the same series

• PSE-PM8DNRL-E3
• PSE-PM8DPRL

Frequently asked questions

Does PSE-PM8DNRL have a PNP or NPN output?

PSE-PM8DNRL has an NPN output with NO and NC contacts (programmable). Check that your PLC input matches this output type.

What is the sensing distance of PSE-PM8DNRL?

The sensing distance (Sn) is 2–8 m.

How is PSE-PM8DNRL connected?

PSE-PM8DNRL is supplied with the connection: cable 2 m. The cable is part of the sensor; the other end is free for connection to a terminal block.

How is PSE-PM8DNRL wired by wire colours?

Brown wire to supply plus, blue to minus, black is the NO output and white the NC output. The coding complies with IEC 60947-5-2.

What is the advantage of a laser over standard red LED light?

The laser beam has a much smaller diameter, so it detects smaller objects and allows more precise alignment over a longer distance. It is also visible, which makes setting up during installation easier.