FS-N42P Keyence Fiber Optic Sensor Amplifier

Keyence FS-N42P Fiber Optic Sensor Amplifier – PNP Expansion Unit with OLED Display

Technical Specifications

• Brand: Keyence
• Model: FS-N42P
• Series: FS-N40
• Category: Digital fiber optic sensor amplifier
• Output type: PNP
• Control outputs: 1
• External inputs: None
• Unit type: Expansion unit (cable type)
• Response time: 23 µs (S-HSPD), 50 µs (HSPD), 250 µs (FINE), 500 µs (TURBO), 1 ms (SUPER), 4 ms (ULTRA), 16 ms (MEGA), 64 ms (TERA)
• Light source: Red four-element LED, 660 nm wavelength
• Supply voltage: 10–30 VDC, ripple 10% P-P or less, class 2 or LPS
• Power consumption: 910 mW or less (36 mA at 24 V; ECO ON 840 mW; ECO FULL 750 mW)
• Control output rating: 30 V max, 100 mA max; residual voltage 1.6 V at 10 mA, 2.2 V at 10–100 mA
• External input timing: 2 ms ON / 20 ms OFF or longer
• Operating temperature: -20 to +55 °C, no freezing, derates with expansion
• Unit expansion: Up to 16 units (17 total including main; dual output counts as 2)
• Weight: Approx. 48 g
• Communication ports: None built in, no protocols supported

Performance and Environmental Notes

• The 23 µs response supports fast detection and tight timing windows.
• The 660 nm red LED keeps emitted light steady for reliable sensing.
• A single PNP output suits source-type PLC inputs and control relays.
• At only 48 g, the module adds little load to rail-mounted assemblies.
• The unit works from -20 to +55 °C and derates as expansions grow.
• Power draw stays at 910 mW or less, which limits heat build-up.
• No external input keeps the wiring simple for basic switching tasks.

Installation Guide

• Link the expansion unit to a compatible Keyence FS-N40 main amplifier first.
• Mount the module on a DIN rail or bracket and route the cable safely.
• Feed the 10–30 VDC supply and follow the class 2 or LPS rule.
• Wire the PNP output to your PLC input or load within 30 V and 100 mA.
• Attach the fiber cable and set the sensing threshold on the display.
• Count every dual-output unit as two when planning the 16-unit limit.

Packing List

• 1 × Keyence FS-N42P expansion unit
• 1 × Instruction manual
• 1 × Protective packaging
• Shipping via FedEx, UPS, or DHL

FAQ

• Q: Can the FS-N42P run without a main unit?
  A: No, it is an expansion unit and needs a compatible FS-N40 main amplifier.
• Q: What output type does it provide?
  A: It offers one PNP control output and no external input.
• Q: What is the fastest response time?
  A: It reaches 23 µs in S-HSPD mode and 64 ms in TERA mode.
• Q: What supply voltage does it require?
  A: It runs on 10–30 VDC with 10% ripple or less.
• Q: What is the operating temperature range?
  A: It works from -20 to +55 °C without freezing.
• Q: How many units can I connect in total?
  A: You can link up to 16 units for 17 total, counting dual output as two.
• Q: Is the product new and in stock?
  A: Yes, it is brand new and original, and we hold stock.
• Q: How fast do you ship, and which carriers do you use?
  A: We ship within 5 days via DHL, FedEx, UPS, and similar carriers.
• Q: What is your return policy?
  A: We support returns within 30 days of delivery.