Expandable Area Sensor

PJ series

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Expansion Unit PJ-56

PJ-56 - Expansion Unit




No. of beam axes


Beam axis spacing

40 mm 1.575" max.*1

Maximum optical axis number

28 optical axes (PJ-50A x 1 + PJ-55A + PJ-56) *2

Detection area

Detecting distance

5 m 16.40'

Detectable object

Opaque materials (50 mm dia. min.) *3

Light source

Infrared LED

Indicator lamp

Output (PJ-50AR)/Power (PJ-50AT) : Red LED, Stable operation (PJ-50AR) : Green LED

Response time

15 ms or less


Control output

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

Control output

Operation mode

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

Noise resistance (power supply line)

350 V, pulse width : 1 µs (by way of a noise simulator)

Protection circuit

Reversed polarity, overcurrent protection, surge absorber


Power voltage

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

Current consumption

50 mA (PJ-56T: 10 mA, PJ-56R: 40 mA) (total of T, R)*4

Environmental resistance

Enclosure rating


Ambient light

Incandescent lamp: 3,500 lux max., Sunlight: 12,000 lux max.

Ambient temperature

-20 to +50 °C -4 to 122 °F (No freezing)

Relative humidity

35 to 85 % RH (No condensation)

Vibration resistance

10 to 55 Hz, Double amplitude 1.5 mm 0.06", 2 hours in each of the X, Y, and Z directions

Shock resistance

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


Housing : Glass-fi bre reinforced plastic, Lens cover : PFA


PJ-56T: Approx. 120 g, PJ-56R: Approx. 125 g

*1 The optical axis pitch of the hinged section may be 40 mm 1.575" or more depending on the mounting method.
*2 Up to two PJ-56 units can be used with each set of expandable area sensors.
*3 When the optical axis pitch of the hinged section is 40 mm .
*4 This is the value with a power supply voltage of 24 V. (80 mA for the PJ-50A, 20 mA for the PJ-55A, and 45 mA for the PJ-56 with a power supply voltage of 12 V.)

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