Autonics PSN17-8DP Square-type Inductive Proximity Switch

Non-shielded, PNP n, 3-wire DC

Spiegazione del codice modello

PSN: Square-type inductive proximity switch (upgraded successor to legacy PS17 series)

17: 17 mm square housing dimension

8: Rated sensing distance 8 mm (for ferrous steel)

D: DC 3-wire type

P: Uscita PNP

No suffix = Normally-Open (NO); -DN = NPN NO; -DP2 = PNP NC; -F = Connector-type

Specifiche principali

Cablaggio (3-filo)

1. Marrone: DC +12-24 V
2. Blu: DC 0 V
3. Nero: Uscita segnale PNP (connect to PLC input terminal)

PNP principle: High-level output. When metal approaches, the black wire outputs +24 V. Built-in reverse-polarity, surge and overcurrent protection.

Series Cross-reference

PSN17-8DN: N.NPN, 8 mm

PSN17-8DP2: PNP NC, 8 mm

PSN17-8DP-F: 8 mm PNP NO, Connettore M8, no cable

Linee guida per l'installazione

1. Non-shielded design: Do not embed the sensore in metal. Maintain ≥8 mm clearance from side metal surfaces; otherwise sensing distance will degrade.
2. When mounting two identical sensors side-by-side, keep center-to-center spacing ≥24 mm to prevent mutual interference.
3. Recommended working gap: 0-5.6 mm (reliable sensing range). Avoid permanent contact with metal surfaces.

Domestic Equivalent Selection Reference

17 mm square housing, 8 mm sensing distance, PNP n, 3-wire DC10-30V, IP67:

Hugong: SN17-8DP

Delta: PS-17-DP8

Innovazione: IS-Q17-08-DP

Importante: Must select non-shielded versions. Shielded types only offer 4-5 mm sensing distance and cannot directly replace PSN17-8DP.

Casi pratici di applicazione per Autonica PSN17-8DP

PSN17-8DP: 17 mm square, non-shielded, PNP n, 8 mm sensing distance, IP67. Designed for non-contact metal detection as a mechanical limit-switch replacement. PNP output is compatible with most European and domestic PLC inputs.

Caso1: Conveyor Lines — Metal Tooling Pallet Position Detection

Applicazione: Power-and-free / roller conveyor, trigger signals when metal tooling pallets arrive at workstations

Installazione: Mount sensor on side frame, align with metal target plate on pallet, working gap 3-6 mm. For non-shielded type, avoid surrounding metal embedding; maintain ≥8 mm side metal clearance.

Funzione: Upon pallet arrival, PSN17-8DP sends PNP high-level signal to PLC to trigger stopper cylinder and start workstation processing. Signal drops when pallet departs for next-part release.

Vantaggi: IP67 rated against workshop dust and light cutting-fluid splashes. Red LED indicator enables fast on-site troubleshooting.

Nota: Maintain ≥24 mm spacing for adjacent sensors to avoid crosstalk.

Caso2: Pneumatic Machinery — Cylinder Home / End-of-stroke Limit

Applicazione: Assembly machines, stamping auxiliary equipment. Position feedback for cylinder piston / piston rod, replacing mechanical limit switches.

Installazione: Mount sensor on external bracket, target metal stop block on cylinder. 8 mm long sensing distance tolerates minor mechanical vibration.

Logica: When piston retracts home, approaching metal target outputs +24 V to PLC to enable next-step execution. A second identical sensor detects full-extension position.

Vantaggi: Contact-free operation eliminates mechanical wear for longer service life. Direct PNP connection to PLC inputs, no auxiliary relay required.

Caso3: Packaging Machinery — Metal-part Counting & Material-present Detection

Applicazione: Hardware-parts packaging, vibratory feeder systems. Detect passing metal components for counting and no-material alarm.

Installazione: Mount beside vibratory-feeder outlet; trigger signal as workpiece passes sensing face.

Funzione: Output pulse signals for PLC counting. Prolonged signal absence triggers no-feed alarm and equipment stop.

Condizioni operative: Resists oil mist and dust in packaging workshops. 200 Hz response frequency supports medium-speed feeding-line counting.

Caso4: Magazzinaggio & Logistics — Transfer-mechanism Positioning

Applicazione: AS/RS transfer trolleys, lifting transfer mechanisms. Confirm metal carriage position.

Scopo: Homing and workstation positioning. Metal target approaches sensor to stop motor upon position arrival.

Giustificazione della selezione: 8 mm sensing distance grants generous installation tolerance against minor mechanical misalignment. Compact 17 mm square form factor fits confined frame spaces.

Caso5: 3C Automated Assembly — Gripper-status Detection

Applicazione: Automated fixtures, verify metal gripper closing status.

Installazione: Fix sensor on fixture body targeting moving metal gripper parts. Gripper closure triggers sensor output. PLC confirms secure clamping before handling. Absence of signal indicates incomplete clamping and triggers interlock alarm to prevent handling.

Nota: Optimized for ferrous metals. Sensing distance degrades to 4-5 mm for aluminum / rame; reduce installation gap accordingly.

Caso6: Modifica & Replacement on Legacy Equipment

Applicazione: Replace failed legacy square proximity switches such as PS17-8P or domestic SN17-8DP.

PSN17-8DP shares identical mounting dimensions with older PS17 series. Drop-in replacement with unchanged wiring: PNP n, 10-30 Alimentazione VCC.

General On-site Application Notes

1. Non-shielded construction: Never embed within metal. Maintain adequate clearance around sensing face, otherwise sensing range drops significantly.
2. PNP wiring: Brown →24V+, Blue →0V, Black →PLC input. Black wire outputs +24 V when metal target approaches.
3. Max load current 200 mA. Do not drive large-coil solenoid valves directly. Use PLC input or intermediate relay.
4. Alluminio, copper and stainless-steel targets reduce effective sensing distance; reduce working gap.

Extended Application Fields for Autonics PSN17-8DP

Key Features Recap: 17 mm square non-shielded inductive proximity switch, 8 mm sensing distance, PNP n, DC10-30 V, IP67, 200 Hz. Optimized for ferrous-metal detection. Compatto, polvere- and light-oil resistant.

Limitazioni: Only detects metals; reduced range for Al/Cu/SS; non incorporabile.

1. Macchina utensile & Lavorazione dei metalli
2. Machine-tool safety-door latch detection: Detect metal latch on safety door. Machine enable signal only valid when door is fully closed for safety interlock.
3. Work-piece presence detection on stock racks: Lathe loading-station raw-metal blank detection; no-part condition triggers stop alarm.
4. Chip-conveyor scraper confirmation: Monitor scraper-chain position to detect jamming or chain breakage.
5. Idraulico / pneumatic fixture lock confirmation: Detect metal locking-block position to verify fixture clamping and prevent unclamped-part machining defects.
6. Macchinari tessili
7. Origin-position detection for metal swing-arms / sliders on warp-knitting and carding machines: Machine homing reference.
8. Limit detection for metal stops on fabric-winding machines: Replace impact-prone mechanical limit switches for roll-end-position control.

IP67 withstands heavy cotton-lint dust in textile workshops.

3. Gomma & Plastics Injection Molding
4. Position feedback for robot side-flip / turnover mechanisms: Confirm completion of flip / side-posture motion before pick-and-place.
5. Ejector-pin retract confirmation: Verify metal ejector pins are fully retracted to enable safe mold closing.
6. Position sensing for cut-off stations on rubber extruders: Trigger cutting action upon metal-block arrival.

Tolerates plastic dust and release-agent spray in molding environments.

4. Costruzione & Agricultural Mobile Machinery

Avvertimento: Vehicle-supply voltage fluctuates widely. Stabilize supply within 10-30 VDC and add surge-suppression components.

1. Position feedback for auxiliary mechanical arms / baffles on compact loaders and transfer equipment.
2. Origine / limit-position detection for sliders on agricultural transplanters and seeders.

IP67 handles outdoor mud and dust; use shock-absorbing brackets for high-vibration locations.

5. Automotive-component Non-standard Automation
6. Welding-fixture clamping confirmation: Verify metal-clamp closure before welding start. ⚠️ For welding stations, route sensor cables away from welding-gun cables for noise immunity.
7. Metal-target-equipped pallet arrival detection for part-handling lines: Trigger marking and scanning stations.
8. Press-fit-machine home-position detection: Confirm press ram retracts fully before part loading/unloading.
9. Smistamento logistico & AGV Systems
10. AGV crash-buffer-plate position detection: Retreating buffer plate triggers sensor for emergency AGV stop upon collision.
11. Diverter-wheel mechanism position confirmation: Verify metal stop-block position after sorting-diverter actuation.
12. Home and limit-position sensing for light-duty lifting machines.
13. Fan, Pompa & General-purpose Equipment Monitoring
14. Simplified speed measurement for fan / reducer flywheels: Mount metal trigger tab on flywheel; sensor outputs pulse signals for PLC speed calculation. Max frequency limited to 200 Hz.

200 Hz corresponds to theoretical maximum 12 000 RPM; practical application recommended ≤6000 RPM for safety margin.

2. Position feedback for small electric valve actuators: Detect metal lever position to confirm open / closed status.
3. Macchine per la lavorazione del legno
4. Home and limit-position detection for metal push-plates on panel saws and CNC routers.
5. Slider-position sensing for feeding mechanisms. IP67 resists wood-chip dust.

❗Unsuitable Application Scenarios (Insidie ​​della selezione)

1. Non-metal targets (plastica, legna, carta): Inductive sensors cannot detect non-conductive materials; select photoelectric sensors instead.
2. Pulse frequency above 200 Hz: Signal loss occurs; use higher-frequency sensor models.
3. Embedded-in-metal installation requirement: Non-shielded PSN17-8DP will malfunction when embedded. Choose shielded PS17-5DP instead.
4. Heavy-welding high-current environments: Implement cable shielding and proper routing to avoid false triggering.
5. Direct solenoid-valve-coil driving: Max 200 mA load rating. Connect via PLC input or intermediate relay.