Pepperl+Fuchs 131566 Reflective Photoelectric Sensor

Alternate Designations: HDM-NR-287-523-01-00 / Heidelberg OEM Part ZD.287-523-01-00

Información básica

Pepperl+Fuchs Nro. de orden: 131566

P+F Internal Model: ST-H.1-19,5

Heidelberg Machine Part No.: HDM-NR-287-523-01-00 (ZD.287-523-01-00)

Tipo de producto: Diffuse-mode sensor fotoeléctrico (photocell)

Target Application: Heidelberg Stahlfolder folding machine, sheet-presence detection for printing equipment. Custom OEM-only variant; no public datasheet available on Pepperl+Fuchs official website.

País natal: Singapur

Peso: aprox. 30 g

Eléctrico & Especificaciones mecánicas

1. Voltaje de suministro: 10…30 VDC
2. Conexión: M12-pin male connector
3. Alojamiento: Compact square PBT plastic housing with two mounting screw holes
4. Clase de protección: IP67
5. Indicadores: Dual-LED (fuerza, switching status)
6. Producción: PNP, short-circuit protected
7. Temperatura de funcionamiento: -25 … +55 ℃

Explicación del código del modelo

131566: Pepperl+Fuchs OEM part number

ST-H.1-19,5: Internal sensor series designation

HDM-NR-287-523-01-00: Heidelberg machine-specific part number, not a Pepperl+Fuchs model; printed on printing-machine accessory labels.

Repair & Notas de adquisiciones

1. This is a custom OEM sensor for printing-machine applications. Standard off-the-shelf Pepperl+Fuchs photoelectric sensors cannot be directly substituted. Light spot geometry, sensing range and output timing are custom-tuned for folding-machine operation.
2. Second-hand unit inspection checklist:

M12 connector pins free of corrosion and pin-retraction damage

Optical lens free of scratches, ink and dirt contamination

Power LED illuminates upon power-on; output state toggles when tested with a reflective target

No short-circuit across supply and output pins

3. Abastecimiento: Always specify Pepperl+Fuchs order number 131566. Heidelberg HDM-part numbers cannot be recognized by Pepperl+Fuchs distributors.

Asignación de pines (M12-4-pin male, view from connector face)

Pepperl+Fuchs 131566 Documentación técnica

Aviso importante: 131566 (ST-H.1-19,5) is a custom OEM-exclusive sensor for Heidelberg printing presses. No original PDF datasheet is published by Pepperl+Fuchs. This document is compiled from physical-part labelling, OEM-supplier field measurements and Heidelberg machine manuals, and is suitable for maintenance, procurement, commissioning and second-hand-unit validation.

Alternate designation: HDM-NR-287-523-01-00 (Heidelberg part number, not a Pepperl+Fuchs model)

1 Descripción general del producto

2 Clasificaciones eléctricas

M12-4-pin Pinout (masculino, view from connector end face)

Nota de cableado: Do not wire pin 4; do not connect pin 4 to 0V, otherwise sensor malfunction will occur.

3 Óptico & Parámetros mecánicos

1. Rango de detección: 0…19.5 mm (suffix 19,5 denotes nominal sensing distance)
2. Punto de luz: Small-spot optics optimized for thin-sheet detection. Direct replacement by standard-range commercial photoelectric sensors is not permitted.
3. Montaje: Two Φ3.2 mm mounting holes integrated into housing; M3 mounting screws, recommended torque 0.4-0.6 N·m
4. Housing Overall Dimensions: W14 mm × H31 mm × D22 mm
5. LED Indicators:

LED verde: Power-supply status

LED amarillo: Switching-status indicator (illuminates when reflected light is detected)

4 Estándares & Certificaciones

CE-marked, compliant with EN 60947-5-2 for photoelectric sensors

No public UL file (OEM custom variant)

5 Instalación & Commissioning Instructions

1. Recommended mounting gap between sensor and sheet/reference surface: 8-16 milímetros. Avoid direct contact; do not exceed 19.5 mm maximum sensing distance.
2. Optical-axis alignment: Lens must face the sheet-travel path. Keep lens surface clean; ink and dust accumulation will trigger false detection.
3. No sensitivity-adjustment potentiometer: Parameters are factory-fixed; no on-site adjustment possible.
4. Cableado: Use M12-4-pin female-cable assembly; connect pins 1-2-3 only, pin 4 unused.

6 Tabla de solución de problemas

7 Obtención & Replacement Critical Notes

1. Always place orders using Pepperl+Fuchs order number 131566. Pure-reference to HDM-NR-287-523-01-00 will not be recognized by Pepperl+Fuchs channel partners.
2. This is an exclusive Heidelberg OEM custom part. Standard Pepperl+Fuchs series (p.ej. RL31) differ in spot geometry, switching threshold and timing behaviour. Direct drop-in substitution causes missed-sheet and false-detection faults and is discouraged for printing-press use.
3. Second-hand unit validation steps:

1) Inspect M12 connector pins for oxidation and pin-retraction damage

2) Check lens for cracks and deep scratches

3) Apply 10-30VDC supply; confirm green power-LED lights up

4) Hold white reflective paper in front of lens: yellow LED turns ON. Remove paper: yellow LED turns OFF

5) Measure pin-2 output with multimeter; confirm PNP level toggles correctly; no internal short-circuit.

8 Notas de seguridad

1. Do not aggressively wash sensor lens with strong solvents; optical coating will be degraded. Clean only with lint-free cloth.
2. Output is PNP sourcing type; connect only to PLC high-level-input channels. Incompatible with NPN-sinking inputs.
3. Do not exceed maximum 30 VDC supply voltage; permanent internal circuit damage may occur.

Working Principle of Diffuse-Mode Photoelectric Sensors

Pepperl+Fuchs 131566 is a diffuse-mode photoelectric sensor, with emitter and receiver integrated within one single housing.

Fundamental Principle

Two core internal components:

1. Transmisor: LED infrarrojo: Emits modulated infrared light (modulation suppresses false triggering caused by ambient workshop-lighting and sunlight).
2. Receptor: Phototransistor / Photo-IC: Captures light reflected back from targets.

Functional sequence:

1. Infrared LED emits light beam outwards.
2. Beam strikes the surface of target object (papel / workpiece).
3. Object surface diffusely reflects part of the incident light.
4. Portion of reflected light returns to the sensor receiver window.
5. Receiver chip detects incoming light → internal circuitry activates and toggles solid-state switching output (PNP / NPN level change).

⚠️ Distinction from retro-reflective sensors (separate reflector plate required):

Diffuse-mode: No reflector plate required. Relies on natural reflectance from target surface. Model 131566 works in this way for sheet-detection.

Retrorreflectante: Sensor plus dedicated reflector plate. Light bounces off reflector; object interrupts beam to trigger switching.

Two Standard Switching Logics

1. Luz encendida: Output becomes active when reflected light is received. When object moves away / blocks return light path, output de-energizes.

✅ Pepperl+Fuchs 131566: Luz encendida. When sheet enters detection zone, sheet reflects infrared light, yellow LED illuminates and PNP output turns high. After sheet passes, reflected-light signal vanishes and output de-activates.

2. Dark-ON: Output becomes active when return-light signal is absent; output de-activates upon light reception.

Key Influencing Factors (Field-fault root-causes for folding-machine installations)

1. Distancia de detección

Each sensor has a defined nominal sensing range. For 131566 maximum range =19.5 mm. Target outside this distance yields insufficient reflected-light amplitude for reliable triggering.

2. Target Colour / Reflectivity

White paper gives high reflectance and reliable triggering. Negro / matte-dark objects deliver substantially reduced effective sensing range.

3. Light-spot Geometry

OEM printing-special sensors use small-spot optics for narrow-sheet detection. Standard-commercial sensors feature large spot sizes and may falsely trigger from metallic machine-frame background reflections. This is the primary reason that 131566 cannot be arbitrarily substituted by general-purpose sensors.

4. Lens Contamination

Ink-and-dust fouling blocks outgoing and incoming light paths and causes complete sensor failure; this represents the most-common failure mode within printing-plant environments.

5. Modulated-light technology

Emission is high-frequency-modulated infrared. Receiver circuitry only responds to this specific modulation frequency. Unmodulated ambient daylight and workshop-lamps are filtered out for anti-interference performance.

Comparison Table of Three Common Photoelectric Sensor Types

Practical Application Example for Heidelberg Stahlfolder with 131566

Sensor is mounted in the sheet-transport path of the folding machine, operating gap set to approx. 8-16 mm from sheet plane.

Sheet passing through detection zone: White sheet reflects infrared light back to receiver → yellow LED lights up; PNP output goes high; machine control registers sheet present.

Sheet exits detection zone: Only dark-metallic machine frame is present; return-light amplitude falls below threshold → yellow LED switches off; output de-energizes; machine registers sheet-departure.

Typical Application Scenarios for Diffuse-Mode Photoelectric Sensors

Diffuse-mode photoelectric sensors integrate emitter and receiver within one housing. No reflector plate or paired separate-receiver unit is required. Detection relies on light reflected off target-object surfaces. Simple-to-mount, and among the highest-volume sensor categories deployed across industrial automation.

Representative device: Pepperl+Fuchs 131566 (sheet-detection for Heidelberg folding machines)

1 Impresión & Paper-processing Industry

1. Sheet-presence detection: Folding machines, die-cutters and printing-press paper-paths. Detect sheet arrival, missing-sheet conditions, double-sheet pre-warning and sheet-trailing-edge monitoring. This is the exact application of unit 131566; small-spot variants are purpose-built for thin-paper sensing.
2. Label-presence detection: Verify label-in-position and label-web breakage.
3. Paper-roll end-of-stock detection: Detect exhaustion of raw-material paper reels.

Industry-specific pain points: Lens fouling by ink and paper dust; large reflectance variation between black-and-white substrates. Prefer small-spot fixed-threshold OEM-grade sensors.

2 Material-handling & Conveyor-line Systems

1. Work-piece-arrival detection: Belt-driven and roller-conveyor systems. Detect carton-or-work-piece arrival at workstation to trigger actuators, scanners and stoppers.
2. Item counting: Generate switching pulses as objects pass the sensor for production-volume tallying.
3. Bin-level presence-check: Detect presence / absence of components inside bins and feeders for missing-part alarms.
4. Jam-detection monitoring: Identify material-pile-up conditions within transfer chutes.

3 Maquinaria de embalaje

1. Pouch / carton detection: Confirm feeding-of-packaging material into processing stations; empty-pack identification.
2. Tapa & component-presence checks: Filling-and-sealing-machinery; confirm component-in-place status.
3. Finished-goods ejection confirmation: Verify finished-product output from process stations.

4 Machine-tool & Assembly-automation

1. Work-piece-in-fixture validation: Robot-loading / unloading stations; confirm correct part seating.
2. Small-component presence-detection: Detect springs, screws and plastic-moulded-parts.
3. Hopper low-level alarm: Trigger warning when feed-hopper component stock runs low.

5 Fabricación de automóviles

1. Component-in-jig confirmation for car-body-assembly tooling.
2. Transfer-trolley position-detection.
3. Component-transfer-line counting.

6 Consumer-electronics & Light-manufacturing

1. PCB-board and plastic-housing presence-detection.
2. Conveyor-line object-pass-by monitoring.
3. Small-part feeder-output-verification.

7 Lifting-warehousing & General-purpose Machinery

1. Fork-position simple-detection.
2. Object-presence monitoring for safety-door zones (selected variants).

Diffuse-mode Photoelectric Sensor Selection Criteria & Limitaciones de la aplicación (Engineering Focus)

1. Strong dependency on target-object colour

Light-coloured / white surfaces deliver high reflectance and extended effective sensing distance. Black and matte-dark targets reduce usable sensing distance drastically; actual range may drop to only 30-50 % of nominal-rated value.

2. Background-reflection susceptibility

Bright metallic rear-background surfaces may produce false-triggering. For such deployments specify small-spot or background-suppression (bgs) diffuse-mode sensors.

Pepperl+Fuchs 131566 implements small-spot optics to minimise interference from metallic folding-machine frames within tight-clearance mechanical assemblies.

3. Limited absolute sensing range

Standard diffuse-mode sensors typically cover tens-to-hundreds of millimetres. For long-distance detection select retro-reflective or through-beam sensor configurations.

4. Poor performance with transparent targets

Glass and clear thin-film substrates cannot be reliably sensed by standard diffuse-mode sensors. Use dedicated transparent-object-detection sensor models.

Quick-comparison Table: Diffuse-mode / Background-suppression / Retrorreflectante / barrera