Keyence FS-N41C Digital Fiber Optic Sensor

The FS-N41C is a high-performance digital fiber optic sensor from Keyence, built for fast, precise detection in industrial environments. Featuring ultra-fast response times down to 23 µs, dual control outputs, and a compact M8 connector, it is ideal for high-speed automation, assembly lines, and sensing tasks in confined spaces.

Technical Specifications

Model: FSN41C
Type: M8 Connector, Main Unit
Series: FS-N Series
Manufacturer: Keyence

Response Time Settings

• Super High Speed (S-HSPD): 23 µs
• High Speed (HSPD): 50 µs
• Fine (FINE): 250 µs
• Turbo (TURBO): 500 µs
• Super (SUPER): 1 ms
• Ultra (ULTRA): 4 ms
• Mega (MEGA): 16 ms
• Tera (TERA): 64 ms

I/O Specifications

Control Outputs: 2 open-collector outputs (NPN/PNP selectable)

• Max Voltage: 30 VDC
• Max Load: 100 mA per output
• Total: 100 mA (solo) / 20 mA (expansion mode)

External Input:

• ON Time: 2 ms or longer
• OFF Time: 20 ms or longer

Residual Voltage:

• NPN: ≤1.4 V (≤10 mA) / ≤2 V (10–100 mA)
• PNP: ≤1.6 V (≤10 mA) / ≤2.2 V (10–100 mA)

Light Source

• Type: Red Four-Element LED
• Wavelength: 660 nm

Protection Features

• Reverse power protection
• Output overcurrent protection
• Output surge protection
• Reverse output connection protection

Mutual Interference Prevention

• S-HSPD / HSPD: 0 units
• FINE: 4 units
• TURBO to TERA: 8 units
• Double when “Double” mode is enabled

Power & Energy Consumption

Power Supply: 10–30 VDC (Class 2 or LPS, max 10% ripple)

Power Usage:

• Normal: ≤910 mW
• ECO ON: ≤840 mW
• ECO FULL: ≤750 mW

Environmental Resistance

• Ambient Light: 20,000 lx (lamp), 30,000 lx (sunlight)
• Temperature Range: -20°C to +55°C
• Vibration: 10–55 Hz, double amplitude 1.5 mm, 2 hrs per axis
• Shock Resistance: 500 m/s², 3 times per axis

Material & Construction

• Housing: Polycarbonate (main unit & cover)
• Weight: Approx. 25 g

Key Features & Benefits:

✅ Ultra-Fast Response Time: Enables high-speed detection, ensuring maximum efficiency in automation applications.

✅ Versatile Detection Modes: Offers eight response settings (S-HSPD to TERA) to optimize performance based on application needs.

✅ Dual Outputs for Enhanced Control: Features two open-collector outputs, allowing for advanced automation configurations.

✅ Energy-Efficient Performance: Operates on as low as 750 mW, making it ideal for power-sensitive applications.

✅ Superior Interference Prevention: Prevents signal disruption with multi-unit interference prevention technology.

✅ Robust & Durable Build: Features vibration resistance and a reinforced polycarbonate casing for harsh industrial environments.

✅ Compact & Lightweight: At just 25 g, it provides easy integration into existing automation setups.

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