FS-N43N Keyence Fiber Optic Amplifier FS-N40 Dual NPN

FS-N43N Keyence Digital Fiber Optic Sensor Amplifier

The FS-N43N is a main unit fiber optic amplifier from the FS-N40 series. It offers dual NPN output and an OLED display. Response time drops to 23 µs in S-HSPD mode. A red four-element LED at 660 nm drives stable detection. The unit fits high-speed lines that need fast setup and clear readouts.

Detection and Response Data

• Model: FS-N43N
• Brand: Keyence
• Series: FS-N40
• Type: Digital fiber optic sensor amplifier, cable type
• Output: NPN
• Role: Main unit, dual output
• Light source: Red four-element LED, 660 nm
• Response time: 23 µs S-HSPD, 50 µs HSPD, 250 µs FINE, 500 µs TURBO
• Response time: 1 ms SUPER, 4 ms ULTRA, 16 ms MEGA, 64 ms TERA
• Unit expansion: Up to 16 units, 17 total including main, dual output counts as 2

I/O Specifications

• Control outputs: 2
• External inputs: 1
• Control output rating: Open-collector, 30 V max, 100 mA max per output
• Residual voltage: 1.4 V at 10 mA, 2 V at 10 to 100 mA
• External input time: 2 ms ON, 20 ms OFF or longer

Electrical and Environment Data

• Supply voltage: 10 to 30 VDC, 10% ripple P-P or less, class 2 or LPS
• Power consumption: 870 mW or less, 34 mA at 24 V
• ECO ON: 800 mW
• ECO FULL: 710 mW
• Operating temperature: -20 to +55 °C, no freezing, derates with expansion
• Storage temperature: Not available
• Humidity: Not available
• Protection rating: Not available
• Weight: Approx. 83 g
• Ports: None built in
• Protocols: None
• Communication expansion: None
• Lifecycle: Active, Keyence production confirmed. Last verified: 2026-09

Where It Fits Best

• High-speed part counting on conveyors
• Small object detection in tight spaces
• Label and mark sensing on web lines
• Semiconductor and electronics assembly
• Packaging lines with fast cycle times
• Retrofit of FS-N40 series banks with spare units

Installation Notes

• Use the main unit at the left end of the bank.
• Count dual output as 2 when planning expansion.
• Keep total units at 17 or less including the main.
• Route fiber and power cables away from drives.
• Match NPN output to your PLC input type.

Ordering, Warranty, and Delivery

• 12-month warranty on every unit
• Dispatch in 24 to 28 hours after order confirmation
• Shipping by FedEx, UPS, and DHL
• Tracking number sent after dispatch
• Stock checked before payment

Why Buy From Oiltech Controls?

• Over 15 years in industrial automation spare parts
• Worldwide shipping with FedEx, UPS, and DHL
• Tested surplus and refurbished options
• 12-month warranty for peace of mind
• Technical check before every shipment
• Support for obsolete control systems

Oiltech Controls Review

Oiltech Controls supplies hard-to-find automation parts. The team checks each unit before shipment. Engineers get clear answers on bank wiring, expansion limits, and response mode setup. The FS-N43N is a strong pick for fast fiber sensing with dual output. For inquiries, email info@oiltechcontrols.com or call +86 158 8020 0923.

Oiltech Controls’s Insight

• Pick response mode by cycle time, not by habit.
• Use S-HSPD only when the line truly needs 23 µs.
• Keep fiber tips clean for stable detection.
• Set ECO mode to cut power in long shifts.
• Label each unit in a bank for fast service.

FAQ

1. How many units can I link to the FS-N43N?
   You can link up to 16 expansion units. This gives 17 total including the main. Dual output counts as 2 units in the bank. Plan your count before mounting.
2. Which response mode should I start with?
   Start with FINE at 250 µs for most lines. Move to HSPD or S-HSPD only for fast cycles. Slower modes like MEGA or TERA help with weak or dirty targets. Match mode to real line speed.
3. Why does my output chatter near the target?
   Check fiber alignment first. Then check the threshold setting. Dust on the fiber tip also causes chatter. Slow the response mode if the line allows it. This filters short signal spikes.
4. Can I use this unit without a main amplifier?
   No. This is a main unit with dual output. It needs no separate main in the bank. Expansion units, however, must connect to a main like this one. Confirm your bank layout before buying.
5. Should I buy new, surplus, or refurbished?
   Choose new for warranty-critical lines. Choose tested surplus when budget is tight and lead time matters. Choose refurbished when the original model is obsolete. Oiltech Controls verifies each option before shipment. All options carry a 12-month warranty.

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