Digital Fibre Optic SensorsFS-V20 series


Fibre Amplifier, Cable Type, Main Unit, NPN


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Main unit:0-line

Light source

Red, 4-element LED

Response time

250 μs (FINE)/500 μs (TURBO)/1 ms (SUPER TURBO)/4 ms (ULTRA TURBO)/500 μs (HIGH RESOLUTION)/50 μs (HIGH SPEED)

Output selection

LIGHT-ON/DARK-ON (switch-selectable)

Detection mode

Light intensity/rising edge/falling edge

Shift function

Max. ±1999 (variable)

Timer function


Timer OFF/OFF-delay timer/ON-delay timer/One-shot timer, selectable


±10% of the Preset Value

Variable range

1 to 30 ms (in 1 ms increments), 30 to 50 ms (in 2 ms increments), 50 to 200 ms (in 10 ms increments), 200 to 500 ms (in 50 ms increments)

Control output

NPN open-collector 100 mA max. (40 VDC max.) *1,Residual voltage: 1 V max.

Monitor output

1 to 5 load resistance to display 0-495 for FINE and TURBO. Voltage output: 1 to 5 V, Load resistance: 10 kΩ min., Repeatability: ±0.5% of F.S.*2

Unit expansion

Up to 16 expansion units can be connected (a total of 17 units).*3

Mutual interference



30 mm (H) x 9 mm (W) x 70 mm (D)


Power voltage

12 to 24 VDC ±10 %, Ripple (P-P) 10 % or less

Power consumption


S-APC OFF: 650 mW max.(27 mA max. at 24 VDC), S-APC ON: 720 mW max.(30 mA max. at 24 VDC)

Normal(S-APC ON)

720 mW (30 mA or less)*4

Normal(S-APC OFF)

650 mW (27 mA or less)*4


ECO half

S-APC OFF: 530 mW max.(22 mA max. at 24 VDC), S-APC ON: 660 mW max.(25 mA max. at 24 VDC)


Power consumption

Eco-Half(S-APC ON)

660 mW (25 mA or less)*4

S-APC OFF(Eco-Half)

530 mW (22 mA or less)*4


ECO all

S-APC OFF: 480 mW max.(20 mA max. at 24 VDC), S-APC ON: 550 mW max.(23 mA max. at 24 VDC)


Power consumption

Eco-All(S-APC ON)

550 mW (23 mA or less)*4

Eco-All(S-APC OFF)

480 mW (20 mA or less)*4

Environmental resistance

Ambient light

Incandescent lamp: 20,000 lux max., Sunlight: 30,000 lux max.

Ambient temperature

-10 to +55 °C (No freezing)*5

Relative humidity

35 to 85 % RH (No condensation)

Vibration resistance

10 to 55 Hz, Double amplitude 1.5 mm, 2 hours in each of the X, Y, and Z directions

Shock resistance

500 m/s2, 3 times in each of the X, Y, and Z directions

Case material



Approx. 80 g

*1 20 mA at maximum for the expansion unit.
*2 Use the FS-V21RM in the FINE or TURBO mode when outputting signals with a monitor.
*3 If more than one unit is used together, the ambient temperature varies with the conditions below. Mount the units on the DIN rail with mounting brackets and check that the output current is 20 mA or less.
1 or 2 Units: -10 to 55°C (14 to 131°F), 3 to 10 Units: -10 to 50°C (14 to 122°F), 11 to 16 Units: -10 to 45°C (14 to 113°F)
*4 When HIGH RESOLUTION has been selected, S-APC ON is fixed. When HIGH SPEED has been selected, S-APC ON is fixed for the R type and for anything other than the R type, S-APC OFF is fixed. For others, the factory setting is S-APC OFF. The value inside the parentheses is the current consumption when using a 24 VAC power supply voltage
*5 To connect several units they must be mounted on a METAL DIN rail. Ensure that the output current is 20 mA max. With several units connected, the allowable ambient temperature range varies as follows: 1 to 2 units connected: -10 to +55 °C, 3 to 10 units connected: -10 to +50 °C, 11 to 16 units connected: -10 to +45 °C

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