SICK WL9L-3P2432 Laser Retro-Reflective Photoelectric Sensor

Basic Model Information

Modello completo n.: WL9L-3P2432

Ordine n.: 1058175

Serie di prodotti: W9 Mini Square Sensore fotoelettrico

Detection Principle: Coaxial Laser Retro-Reflective (with Polarization Filter)

Origine: MALATO, Germania

Scomposizione del codice modello

WL9L 3 P 2432

1. WL9L: W9 series, laser light source, retro-reflective type
2. 3: M12 male 4-pin connector
3. P: PNP transistor output
4. 24: Wide voltage supply DC 10~30V
5. 32: Complementary light-on/dark-on output, single-button teach-in, no IO-Link
6. Core Optical Parameters

3. Prestazioni elettriche
4. Alimentazione elettrica: DC 10～30V, ondulazione < 5Vpp
5. Quiescent Current: 30mA (nessun carico)
6. Produzione: Complementary PNP output (switchable light-on / dark-on)
7. Carica corrente: ≤100mA; derated to 50mA above 50℃
8. Tempo di risposta: ≤0.5ms, switching frequency 1000Hz
9. Protezioni: Protezione da inversione di polarità, protezione da cortocircuito, SIRIC® EMI suppression
10. Protezione dall'ingresso: IP66 / IP67 / IP69K (high-pressure washable)
11. Dimensioni meccaniche & Montaggio

Contorno: 12.2 (W) × 52.2 (H) × 23.6 (D) mm

Montaggio: M3 threaded mounting holes on both sides

Alloggiamento: High-strength VISTAL engineering plastic, PMMA optical lens

Peso: 13G

Temperatura operativa: -10℃ ~ +50 ℃; extended low temp -30℃~+55℃

Temperatura di conservazione: -30℃ ~ +70 ℃

5. M12 4-Pin Pin Assignment (Male Connector)
6. Perno1: Brown DC24V Positive
7. Perno2: White Reserved / No external input
8. Perno3: Blue 0V GND Negative
9. Perno4: Black PNP Signal Output
10. Vantaggi fondamentali
11. Ultra-fine Laser Spot: Stable detection of tiny parts, gaps, labels and transparent films
12. Coaxial Optics + Polarizer: Eliminates false triggering from aluminum foil, stainless steel and mirror surfaces
13. Ultra-long 12m sensing range, enables long-distance installation in compact equipment
14. IP69K dust & water resistance, suitable for food and washing production lines
15. Single-button teach-in, one-click matching for reflector and detection threshold
16. 1kHz high-speed performance, no missing counts on high-speed conveying lines
17. Standard & Accessori opzionali

Reflector not included as standard, separate purchase required: PL80A (standard 80×80 reflector)

Accessori opzionali: L-shaped M3 mounting bracket, REF-AC1000 reflective film, M12 straight/angled connector cables

8. Scenari applicativi tipici

Macchine per l'imballaggio: Presence detection of transparent films, small bottle caps and labels

Apparecchiature elettroniche: Positioning of miniature PCB components and terminals

Material Handling Conveyors: Counting and in-position detection of cartons and metal bins

Food Processing Lines: Washing stations, metal container identification

Machine Tool Automation: Workpiece in-position detection, tiny part presence check

9. Alternative Models in Same Series
10. WL9-3P2432: Standard LED retro-reflective, larger spot, 5portata m, costo inferiore
11. WL9LG-3P2432: Laser retro-reflective, 4.5m max range, economical short-distance variant
12. WL9LC-3P2432A00: IO-Link communication supported, remote parameter upload & diagnosis available

Installazione completa & Commissioning Manual for SICK WL9L-3P2432 Laser Retro-Reflective Photoelectric Sensor

Document Basic Information

Modello: WL9L-3P2432｜Order No.: 1058175

Serie di prodotti: W9L Coaxial Laser Retro-Reflective Photoelectric Sensor

Standard applicabili: IEC60825-1 (Classe 1 Safe Laser), IP67/IP69K, CE, UL

Manual Coverage: Montaggio meccanico, electrical wiring, teach-in calibration, Risoluzione dei problemi, safety specifications

1. Mandatory Pre-Installation Safety Regulations
2. Laser Safety

This product is Class 1 laser; no eye hazards under normal operation. Do not disassemble optical components; do not view laser spot directly through magnifying lenses.

2. Sicurezza elettrica

Disconnect DC24V power supply before wiring or disassembly. Only DC10~30V power permitted; AC220V input is strictly prohibited.

3. Functional Safety Limitation

Not designed for safety circuits such as machine safety gates or emergency stop protection; only for standard presence detection and counting.

4. Restrizioni ambientali

Avoid direct intense sunlight, welding arc light, continuous oil mist spray, and heavy vibration equipment. Vibrazione >10g requires shock-absorbing brackets.

2. Mechanical Mounting Section

2.1 Outline Dimensions (L×A×P)

12.2 mm× 52.2 mm× 23.6 mm, M3 through holes on both sides (hole diameter 3.1mm)

2.2 List of Separate Purchase Mounting Accessories

1. Staffa di montaggio: BEF-WN-W9-2 (Universal L-shaped galvanized steel bracket)
2. Standard Reflector: PL80A (80×80mm, standard for 0~12m); PL40A optional for short range
3. Cavi: M12 4-pin straight / angled cables YF2A14 (2m/5m/10m lengths)

2.3 Mounting Procedures

1. Fix the bracket onto rigid machine frame; M3 screw torque 0.6~0.8N·m, do not over-tighten to avoid cracking housing.
2. Install sensor into bracket with adjustable angle; lock screws firmly to eliminate shaking.
3. Key Rules for Reflector Installation (Critico)

Reflector surface must be perpendicular to sensor laser optical axis, tilt angle ≤3°; signal loss occurs if tilt >5°

Mount reflector on flat, vibration-free metal plate; do not attach to soft plastic or sponge

Laser spot must fall within the central area of reflector; edge reflection reduces sensing range

4. Range Specifications

Absolute Max. Allineare: 12M (with PL80A)

Stable Reliable Operating Zone: 0~8m (engineer recommended range)

Minimum Blind Zone: 0M (coaxial optics eliminates near-range blind zone)

2.4 Mounting Pitfall Prevention

Reserve ≥10mm clearance on both sides of optical path to avoid workpiece or bracket blocking laser beam;

Built-in polarization filter must be utilized for metallic mirror workpieces and aluminum foil packages; avoid overlapping reflections from reflector and target parts;

For food washing stations with IP69K requirement, mount lens facing downward to reduce water and dust accumulation.

3. Electrical Wiring Specifications

3.1 M12 Male 4-Pin Assignment (Standard Brown/White/Black/Blue Wire Color)

3.2 Wiring Construction Standards

1. Selezione del cavo: PVC shielded/unshielded sensor cable, wire cross-section 0.34~0.5mm²;
2. Wiring Separation: Maintain ≥30cm clearance between power cables (inverter, motori) and sensor signal cables; cross wires perpendicularly when necessary;
3. Shield Grounding: Shield layer single-point grounding only at control cabinet side; leave shield ungrounded at sensor end;
4. Output Load: PNP output connects to positive terminal of PLC input module; load current ≤100mA; do not drive solenoid valves directly.

3.3 Electrical Protection Features

Built-in reverse polarity protection, output short-circuit protection, soppressione dei picchi; peak supply ripple ≤5Vpp.

4. Power-On Teach-In Calibration Operation (Single-Button Teach-In)

4.1 Indicator Light Description

LED verde: Power indicator, steady on = normal power supply; off = power cut / cortocircuito

LED giallo: Signal indicator, on = reflected laser received; off = beam blocked

4.2 Standard Teach-In Procedure (Factory Default: Light-On)

1. Accendere, ensure laser beam hits reflector fully, yellow LED stays lit;
2. No workpiece (beam unobstructed): Press and hold teach button on housing for 2s, verde & yellow LEDs flash once synchronously to save reference baseline;
3. Place detection workpiece (beam blocked): Press and hold teach button another 2s, both LEDs flash twice to complete teach-in;
4. Release button and test: Yellow LED off with workpiece present, yellow LED on without workpiece (Light-On mode).

4.3 Switch to Dark-On Mode

After standard teach-in, hold button for 5s; verde & yellow LEDs flash rapidly 3 volte, output switches to Dark-On: yellow LED on and output energized when workpiece is present.

4.4 Restore Factory Default Settings

Hold teach button continuously for 10s; all LEDs flash consecutively, all parameters reset to factory state (Light-On, standard sensitivity).

5. Commissioning Acceptance Criteria
6. No load (no workpiece): Green LED steady on, yellow LED stable on, no input signal to PLC;
7. Beam blocked (workpiece in position): Green LED steady on, yellow LED off, consistent signal received by PLC;
8. Continuous Operation Test: 30min uninterrupted conveyor running without false triggering or missing detections;
9. Limit Condition Test: Stable triggering at 8m maximum operating range and slight dusty environment.
10. Ambientale & Specifiche meccaniche
11. Temperatura operativa: -10℃ ~ +50 ℃; short-term low temp -30℃ (performance degradation occurs)
12. Protezione dall'ingresso: IP66, IP67, IP69K (80℃ high-pressure wash available)
13. Materiale dell'alloggiamento: High-strength VISTAL plastic, resistant to cutting fluid, weak acid and alkali
14. Tempo di risposta: ≤0.5ms, switching frequency 1000Hz, compatible with high-speed conveying lines
15. Spot Specification: φ1mm @ 500mm, high-precision detection for tiny parts and labels
16. Troubleshooting Matrix for Common Faults

8. Maintenance Specifications
9. Ispezione giornaliera: Wipe dust and oil from sensor lens and reflector with lint-free cloth + anhydrous ethanol;
10. Weekly Inspection: Check bracket screws and M12 connectors for looseness or water stains;
11. Annual Calibration: Re-run teach-in procedure to eliminate sensitivity drift caused by dust accumulation;
12. Operazioni vietate: Do not scratch optical lens with hard objects; do not sharply bend M12 connector cables.
13. Notes on Alternative & Matching Part Selection
14. Short-Range Alternative: WL9LG-3P2432 (max 4.5m laser retro-reflective)
15. IO-Link Communication Version: WL9LC-3P2432A00 (supports remote parameter reading & diagnosi)
16. Reflector Selection: PL80A preferred for long distance; REF-AC1000 reflective film for narrow confined spaces

Operating Principle of SICK WL9L-3P2432

1. Sensor Type Definition

WL9L-3P2432 is a coaxial laser polarized retro-reflective photoelectric sensor. Core components: 650nm red laser diode, coaxial beam splitting optics, polarization filter, receiving photodiode, signal processing circuit, PNP output unit.

2. Core Optical Principle: Coaxial Optics (Key Difference from Standard Retro-Reflective Sensors)
3. Transmitter Side

Internal laser diode emits ultra-fine parallel laser beam (1mm spot at 500mm). Beam passes through a transmitting polarizer to output linearly polarized laser with single polarization direction.

2. Coaxial Optical Design

Transmitting and receiving optical paths share one lens. Laser beam emits from sensor center, reflected light returns along identical optical path back to lens, eliminating detection blind zone. Separated standard retro-reflective sensors have near-range blind zones, while this model achieves stable detection at 0m.

3. Reflector Reflection Characteristic

Matched PL80A reflector adopts retroreflective structure: light returns parallel to incident direction even with minor angular offset; meanwhile the reflector changes laser polarization angle.

4. Polarization Screening at Receiver Side

Orthogonal polarization filter integrated inside lens:

Light reflected from reflector: polarization angle shifted, penetrates receiving polarizer, photodiode receives optical signal;

Stray light directly reflected from metal, aluminum foil or mirror targets: unchanged polarization angle, fully blocked by polarizer to avoid false triggering.

> This is the core principle enabling stable detection of glossy metal and film-wrapped packages.

3. Complete Detection Workflow (Two States: Workpiece Present / Absent)

State 1: No Workpiece (Optical Path Unobstructed)

1. Laser beam emits → hits reflector and reflects back along original path;
2. Reflected light passes polarization filter and reaches receiving photoelectric element;
3. Photodiode generates current signal, internal amplifier circuit identifies “return light received”;
4. Circuit outputs corresponding voltage level:

Light-On Mode: PNP output energized (24Uscita V);

Dark-On Mode: PNP output de-energized.

5. Yellow signal LED on housing stays steady lit.

State 2: Workpiece Blocks Optical Path

1. Workpiece cuts laser beam, no light returns to sensor;
2. No input signal to receiving photodiode;
3. Internal circuit judges “no return light”, flips output voltage level;
4. Yellow signal LED turns off.
5. Threshold Adjustment Principle via Single-Button Teach-In

Sensor built-in microcontroller stores two reference light intensity values through single-button teach-in:

1. Maximum received light intensity with unobstructed optical path (reflected by reflector);
2. Minimum received light intensity under full beam blockage;

MCU automatically calculates intermediate threshold to distinguish “light present / light absent”, adapting to dusty environments and minor light attenuation to prevent abnormal operation.

5. Electrical Output Conversion Principle
6. Powered by DC10~30V; internal voltage regulator supplies power to laser diode and processing chip;
7. Analog photoelectric signal amplified, converted to digital signal via ADC and transmitted to MCU;
8. MCU compares light intensity against threshold and drives PNP transistor output;
9. Black wire Pin4 is PNP output: output ≈ supply voltage 24V when energized, max load 100mA; built-in short-circuit and reverse polarity protection circuits.
10. Summary of Principles Corresponding to Key Technical Advantages
11. Ultra-fine Laser Spot: Collimated laser source prevents spot diffusion over long distance, suitable for tiny part and gap detection;
12. Polarization Anti-Interference: Orthogonal polarization optics eliminates false detection from stainless steel and aluminum foil mirror reflections;
13. Coaxial Zero Blind Zone: Shared transmit-receive optical axis enables stable detection at 0m close range;
14. High-Speed Response ≤0.5ms: Fast laser response matched with high-speed processing chip, 1kHz switching frequency fits high-speed production lines.
15. Simplified Plain-Language Operating Principle

The sensor emits thin polarized laser beam; the opposite reflector bounces light back along the original path. Internal polarizing lens only accepts reflected light from the reflector. When a workpiece blocks the laser, no signal is received. Internal circuit switches high/low PNP output voltage levels to transmit “material present / absent” signal to PLC.