SICK WFS340N415 Label Sensor

Ordine n.: 6043920

Applicazione: Labeling machines, label dispensers; detecting labels, label gaps, transparent labels, doublelabel prevention. Infrared forktype label sensore fotoelettrico

Spiegazione del codice modello

WFS: Fork Sensor series

3: Fork width 3 mm

40: Fork depth 42 mm

N: Uscita NPN (affondando)

415: M84pin male connector, front panel keys + dynamic teachin function

Specifiche tecniche principali

M84pin Pin Assignment

1. Marrone: DC + (1030V)
2. Bianco: Teachin input
3. Blu: 0V/GND
4. Nero: NPN output Q

Adjustment via Panel Buttons

1. Dynamic Teachin (autolearn labels): Press「+」and「」simultaneously for 1 sec, LED flashes; feed several labels through the fork slot, press「」to exit and save settings.
2. NO / NC switching: Hold「+」and「」for 6 sec to toggle lighton / darkon mode.
3. Key Lockout: Hold「+」and「」for 3 sec to lock buttons against unintended operation.
4. External teachin via white teachin pin can be triggered by PLC for fullyautomated production lines.

Applicazioni tipiche

Automatic labeling machines & label dispensers: label arrival and gap detection

Transparent / thinlabel detection; doubleoverlap label identification

Confezione, logistica, pharmaceutical highspeed labeling stations; up to 10 kHz switching frequency

Alternative Models in Same Series

1. WFS340P415, Order No.6043921: identical mechanical dimensions, Uscita PNP
2. WFS340N115: uscita cavo fissa (nonconnector version)

Domestic replacement selection criteria: fork width 3 mm, fork depth ≥40 mm, dynamic teachin supported, response ≤100 μs, Uscita NPN.

Basic Troubleshooting

1. Unstable detection: Perform dynamic teachin; ensure label web runs centrally without rubbing fork slot; avoid strong ambient light shining into the fork.
2. Nessuna uscita: Verify M8 wiring; avoid reversed power polarity; confirm output load ≤100 mA.
3. Buttons nonresponsive: Check whether keylock mode is activated.

Practical Application Cases for SICK WFS340N415 (Order No.6043920)

Key capabilities: 10 kHz switching frequency, dynamic teachin, NPN sinking output, 3 mm fork width, IP65 rating. Primarily for selfadhesive labelgap detection, transparentlabel sensing and doublelabel monitoring at labelpeeling stations.

Case 1 Highspeed Food & Beverage Labeler (Carta + PET transparent labels)

Attrezzatura: Automatic roundbottle labelpeeling machine; line speed 180 bottles/min; paper labels and transparent PET sealing labels on glassine release liner.

Process challenges: Conventional colormark sensors frequently miss transparent labels; manual sensitivity adjustment is required when changing label stock; highprecision gap detection is needed for servo label feed control.

Attuazione: Mount WFS340N415 at the labelpeeling edge. Run web while performing dynamic teachin to autocalibrate lightlevel differences among labelfacestock, liner and gap. NPN signal is sent to PLC to stop labelfeed servo for accurate peel positioning.

Vantaggi: Eliminates missed detection of transparent labels; oneshot dynamic teachin for label changeover without manual trimming; doublelabel overlap detection prevents feeding two labels at once and reduces packaging rejects.

Site note: IP65 housing tolerates condensation; prevent strong ambient light hitting the fork window.

Case 2 Pharmaceutical Industry-Cartridge / Vial Labeling & Traceability Coding Line

Attrezzatura: Inline printandapply labeler for regulatory traceability labels; narrow labels with only 23 mm gaps; line speed 120 pcs/min.

Process challenges: Narrow labels and tiny gaps demand high resolution; PLCtriggered remote teachin is required for recipe switching.

Attuazione: Use the white teachin pin for PLCdriven external teachin. PLC pulses trigger autothreshold calibration when switching product recipes; sensor output synchronizes printing and labeling actions.

Vantaggi: Reliable detection of narrow gaps; no manual button operation for recipe changeover; supports batch productswitching and prevents missing / misapplied labels.

Case 3 Dailychemical Industry-Hose / Flatbottle Dualsided Labeler

Attrezzatura: Automatic labeling machine for cosmetic hoses with thinbacking selfadhesive labels; risk of label wrinkling and doublelabels.

Process challenges: Web jitter causes false triggers; heavy EMI from nearby servodrives and frequency inverters.

Attuazione: Ground shielded M8 connector; install sensor at peeling station; run dynamic teachin on good web condition; enable output shortcircuit protection; activate keylock to block operator misconfiguration.

Vantaggi: Improved tolerance to web wrinkles; alarm on doublelabel overlap; keylock eliminates accidental parameter changes and reduces machine downtime.

Case 4 Electronics-Lithiumcell & PCB Label Inspection

Attrezzatura: Automatic label applicator for polyimide (PI) hightemperature labels; intermittent highspeed feeding at 200 cycles/min.

Process challenges: Low optical contrast between PI label and liner; fast response requirement; confined installation space.

Attuazione: Compact forkform factor fits cramped peelhead layout. 50 μs response and 10 kHz frequency support intermittent highspeed motion. Dynamic teachin learns lightlevel difference of PI label against its liner.

Vantaggi: Reliable labelpresent signal at high speed; consistent labeling accuracy and avoids offset labels on battery cells.

Case 5 Converting Industry-Rolllabel Rewind & Slitting Counter

Attrezzatura: Label rewindslitting machine for continuous selfadhesive rolls; label counting and missinglabel detection on running web.

Process challenges: Continuous nonstop web; frequent labelmaterial changeovers.

Attuazione: Label web passes through fork slot. Dynamic teachin identifies label gaps. Sensor pulse feeds PLC for label counting; missinglabel / webbreak condition stops machine via loss of pulses.

Nonlabel Specialpurpose Applications (limiteduse scenarios)

1. Doublesheet detection for thin materials: Thin paper / film; overlapping sheets passing through fork change light transmission and trigger doublesheet alarm; minimum detectable thickness ~2 mm.
2. Smallpart counting: Count thin flat discrete parts passing continuously through fork slot.

Key Site Lessons Learned from Field Cases

1. Dynamic teachin is mandatory for transparent labels; do NOT rely solely on manual +/ adjustment, otherwise intermittent unreliable detection occurs.
2. Leave white teachin pin tied to 0 V when unused. For PLCtriggered teachin, send ≥100 ms highlevel pulse.
3. Keep label web centered inside fork; avoid rubbing emitter/receiver windows, which causes signal drift.
4. Direct overhead lamp / daylight illumination onto fork slot creates false triggers; fit simple lightshield sheetmetal.
5. NPNsinking output requires PLC sinkingtype input module; wrong input type yields zero signal.

Complete Standard Commissioning SOP for SICK WFS340N415

1. Documentare le informazioni di base

Scopo: Standardized installation, messa in servizio, acceptance and maintenance guideline for labelers, dispensers and coding lines.

Modello applicabile: WFS340N415 (Order No. 6043920, NPNsinking, M84pin male, dynamic teachin).

Funzioni principali: Labelgap detection, transparentlabel sensing, doublelabel alarm, missinglabel alarm, highspeed labelfeed positioning.

2. Precommissioning Safety & Prerequisiti
3. Power OFF before wiring / disassembly to avoid shortcircuit damage to sensor or PLC inputs.
4. Fornitura: DC 1030 V, ripple ＜10 %. Avoid poorlyregulated power supplies.
5. Ambiente di installazione: Keep away from direct bright light, condensation water, heavy EMI from servos / convertitori di frequenza.
6. Output load limit: Max. 100 mA; never exceed rated load.
7. Pinout & Cablaggio standard

M84pin male, NPNsinking output, only compatible with sinkingtype PLC inputs:

1. Marrone (Perno1): CC+, connect to 24 V positive.
2. Bianco (Perno2): External teachin input; tie to 0 V if unused; ≥100 ms highlevel pulse for PLCinitiated teachin.
3. Blu (Perno3): 0 V / GND, connect to power negative and PLC common.
4. Nero (Perno4): Uscita segnale NPN, connect to PLC digital input terminal.

Wiring Warnings: Never reverse brownblue power leads. Do NOT leave white teachin wire floating to prevent spurious false teachin triggers.

4. Requisiti di installazione meccanica
5. Mounting location: At labelpeeler outlet; run label web horizontally and centrally through the 3 mm fork slot.
6. Liquidazione: Label web must NOT touch emitter or receiver windows; no friction or lateral offset.
7. Fastening: Tighten mounting screws firmly. No mechanical vibration during highspeed web travel, to prevent measurement drift.
8. Environmental protection: Install lightshield sheetmetal for brightlight stations. Maintain intact housing sealing for dusty / humid locations to satisfy IP65.
9. Parameter Setup via Frontpanel Buttons

5.1 Dynamic AutoTeachin (primary operation)

For standard labels, transparentPET labels, PI hightemperature labels, and materialchange calibration:

1. Poweron machine; thread label web and run at low speed.
2. Hold【+】and【】together for 1 sec. LED flashes, entering teachin mode.
3. Pull 510 complete cycles of “label + gap” through fork slot to let sensor autolearn lightdifference thresholds.
4. Press【】to exit; parametri salvati automaticamente.

5.2 Outputmode Toggle (NO / NC, Lighton / Darkon)

Hold【+】and【】for 6 seconds to toggle lighton / darkon; match to PLC program logic.

5.3 Button Lockout / Unlock

Hold【+】and【】3 seconds to lock or unlock frontpanel buttons to prevent accidental fieldside modification.

5.4 PLCtriggered External Teachin (for frequentrecipechange production lines)

1. Connect white teachin wire to PLC digitaloutput point.
2. PLC sends ≥100 ms highlevel pulse to trigger sensor teachin routine.
3. Drop pulse after labelweb learning completes; parameters autosaved without local operator intervention.
4. Indicazione dello stato del LED
5. Acceso fisso: Normal powered standby.
6. Lampeggiante: Teachin configuration mode.
7. Flashes synchronously with label gaps: Normal detection and stable output signal.
8. No LED / irregular flashing: Guasto all'alimentazione, corrupted parameters or wiring shortcircuit.
9. Machine Integration & Criteri di accettazione

7.1 Noload Test

Run empty releaseliner web; no false triggers or spurious output pulses.

7.2 Loadedweb Functional Test

1. Normal labels: Precise pulses at each gap; reliable PLC counting & posizionamento.
2. Missinglabel / webbreak: No output pulses; machine triggers alarm and stops.
3. Doublelabel overlap: Abnormality detected and alarm activated.
4. Highspeed operation: 180200 cycles/min web speed; zero missed detections and false triggers.

7.3 Acceptance Pass Criteria

1. Zero detectionerror rate during continuous 30min run.
2. No missed / false detection on transparent and thin labels.
3. Fast adaption after materialchange teachin; no further trimming needed.
4. No signal drift or EMIcaused false triggering over test period.
5. Troubleshooting Summary
6. Unstable detection: Rerun dynamic teachin; center label web; clean optical windows; fit lightshield.
7. Nessun segnale in uscita: Doublecheck wiring; confirm PLC uses sinkinginput mode; inspect supply voltage; rule out output overload.
8. Constanton output cannot reset: Toggle NO/NC lighton/darkon setting; redo dynamic teachin; investigate abnormal liner lighttransmission.
9. I pulsanti non rispondono: Hold【+】&【】3 sec to unlock keylock.
10. Missed detection at high speed: Reperform dynamic teachin; tighten mounting bracket; stabilize web transport speed.
11. Routine Maintenance Instructions
12. Quotidiano: PowerOFF then wipe forkslot windows to remove dust and adhesive residue.
13. Settimanale: Check tightness of mounting screws and wiring terminals to eliminate intermittent poorcontact.
14. Mandatory action upon materialchange: Always perform dynamic teachin after changing label material, thickness or color.
15. Longterm storage: Poweroff unit; avoid humid and hightemperature environments accelerating aging.
16. Common Field Pitfalls & Note
17. For transparent labels do NOT manually adjust sensitivity; always perform dynamic teachin, or unstable detection results occur.
18. This NPNsinking sensor works only with sinkinginput PLC hardware. For sourcinginput PLC systems select PNPversion WFS340P415.
19. Teachin white wire must not float; tie to 0 V when unused.
20. Never let label web rub optical windows; rubbing causes permanent optical offset and parameter drift.
21. When installed close to servos and inverters, apply cable shielding and proper grounding to mitigate electromagnetic interference.

Standard Fault & Remedy Table for SICK WFS340N415

1. Instabile / intermittent detection

Causa ultima: Missing dynamic teachin; lateral web offset; contaminated optical window; direct ambientlight intrusion.

Rimedio: Execute dynamic teachin; recenter label web path; clean fork windows; install lightshield sheetmetal.

2. Zero sensor output signal

Causa ultima: Cablaggio errato; PLC sourcinginput module incompatible with NPNsinking; supplyvoltage anomaly; outputcircuit overload.

Rimedio: Crosscheck M8 pinassignment wiring; configure PLC for sinkinginput; verify DC24 V supply; keep output load ≤100 mA.

3. Output stays high and cannot reset

Causa ultima: Lighton / darkon setting mismatches PLC logic; unusual liner lighttransmission property; sensorparameter drift.

Rimedio: Toggle NO/NC mode via buttons; rerun dynamic teachin; inspect / replace defective releaseliner stock.

4. Frontpanel buttons have no reaction

Causa ultima: Buttonlockout function is active.

Rimedio: Hold【+】and【】3 seconds to unlock buttons.

5. Missed detection under highspeed operation

Causa ultima: No reteachin for highspeed condition; loose mounting bracket; web mechanical jitter.

Rimedio: Rerun dynamic teachin for sensitivity calibration; secure mounting hardware; stabilize webtransport velocity.