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          4. Photoelectric Sensors
          5. Expandable Area Sensor
          6. Specs

          Expandable Area Sensor

          PJ series

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          Basic unit/Expansion unit





          Number of optical axes




          Beam axis spacing

          40 mm

          40 mm max.*3

          Maximum optical axis number

          28 optical axes (PJ-50A x 1 + PJ-55A x 12)

          28 optical axes (PJ-50A x 1) +
          (PJ-55A + PJ-56) *4

          Detection area

          120 mm (4 optical axes) to 1080 mm (28 optical axes)

          Detecting distance

          5 m

          Detectable object

          Opaque materials (50 mm dia. min.)

          Opaque materials (50 mm dia. min.) *5

          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.


          Operation mode

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

          Noise resistance (power supply line)

          350 V, 1 µs (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

          90 mA (PJ-50AT: 35 mA, PJ-50AR: 55 mA)*1

          25 mA (PJ-55AT: 5 mA, PJ-55AR: 20 mA) (total of T, R)*1

          50 mA (PJ-56T: 10 mA, PJ-56R: 40 mA) (total of T, R)*1

          Environmental resistance

          Enclosure rating


          Ambient light

          Incandescent lamp: 3,500 lux or less, Sunlight: 12,000 lux or less

          Ambient temperature

          -20 to +50 °C (No freezing)

          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

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


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


          PJ-50AT: Approx. 390 g, PJ-50AR: Approx. 395 g*2

          PJ-55AT: Approx. 60 g, PJ-55AR: Approx. 65 g*2

          PJ-56T: Approx. 120 g, PJ-56R: Approx. 125 g*2

          *1 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.)
          *2 For models PJ-50AT and 50AR, the weight of the 5-m cable is included.
          *3 The optical axis pitch of the hinged section may be 40 mm or more depending on the mounting method.
          *4 Up to two PJ-56 units can be used with each set of expandable area sensors.
          *5 When the optical axis pitch of the hinged section is 40 mm .

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