Small photoelectric sensors

Please note: The sensor is equipped with a special Smart Task function. Additional information can be found in the “Technical Data.” Use of the sensor for pure object detection is limited.
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    • Features
      Device typePhotoelectric sensors
      Functional principlePhotoelectric proximity sensor
      Functional principle detailBackground suppression
      Sensing range max.20 mm ... 350 mm 1)
      Sensing range20 mm ... 350 mm 1)
      Emitted beam
      Light sourcePinPoint LED 2)
      Type of lightVisible red light
      Light spot size (distance)Ø 6 mm (200 mm)
      Key LED figures
      Wave length640 nm


      Single teach-in button

      Pin 2 configurationExternal input, Teach-in input, Sender off input, Detection output, logic output
      • 1) Object with 90% remission (based on standard white, DIN 5033).
      • 2) Average service life: 50,000 h at TU = +25 °C.
    • Safety-related parameters
      MTTFD634 years
      DCavg0 %
      TM (mission time)20 years
    • Communication interface
      Communication interfaceIO-Link V1.1
      Communication Interface detailCOM2 (38,4 kBaud)
      Cycle time2.3 ms
      Process data length16 Bit
      Process data structure

      Bit 0 = switching signal QL1

      Bit 1 = switching signal QL2

      Bit 2 ... 15 = measuring value

      DeviceID HEX0x8000EC
      DeviceID DEC8388844
    • Electrical data
      Supply voltage UB10 V DC ... 30 V DC 1)
      Ripple< 5 Vpp 2)
      Current consumption45 mA 3)
      Protection classIII
      Digital output
      Signal voltage PNP HIGH/LOW> Uv - 2,5 V / ca. 0 V
      Output current Imax.≤ 100 mA
      Repeatability (response time)100 µs 4)
      Switching frequency1,500 Hz
      Switching modeLight/dark switching
      Circuit protection

      A 5)

      B 6)

      C 7)

      D 8)

      Response time Q/ on Pin 2200 µs ... 300 µs 4) 9)
      Switching frequency Q / to pin 2≤ 1,500 Hz 10)
      • 1) Limit values when operated in short-circuit protected network: max. 8 A.
      • 2) May not exceed or fall below Uv tolerances.
      • 3) Without load.
      • 4) Valid for Q \ on Pin2, if configured with software.
      • 5) A = VS connections reverse-polarity protected.
      • 6) B = inputs and output reverse-polarity protected.
      • 7) C = interference suppression.
      • 8) D = outputs overcurrent and short-circuit protected.
      • 9) Signal transit time with resistive load.
      • 10) With light / dark ratio 1:1, valid for Q \ on Pin2, if configured with software.
    • Mechanical data
      Dimensions (W x H x D)15.6 mm x 48.5 mm x 42 mm
      ConnectionMale connector M12, 4-pin
      HousingMetal, zinc diecast
      Front screenPlastic, PMMA
      Weight120 g
    • Ambient data
      Enclosure rating



      Ambient operating temperature–40 °C ... +60 °C
      Ambient temperature, storage–40 °C ... +75 °C
      UL File No.NRKH.E181493 & NRKH7.E181493
    • Smart Task
      Smart Task nameCounter + debouncing
      Logic function




      Timer function


      On delay

      Off delay

      ON and OFF delay

      Impulse (one shot)

      Maximum counting frequency

      SIO Direct: --- 1)

      SIO Logic: 1000 Hz 2)

      IOL: 650 Hz 3)

      Counter reset

      SIO Direct: ---

      SIO Logic: 1,5 ms

      IOL: 1,5 ms

      Min. Time between two process events (switches)

      SIO Direct: ---

      SIO Logic: 500 µs

      IOL: 800 µs

      Debounce time max.

      SIO Direct: ---

      SIO Logic: 30.000 ms

      IOL: 30.000 ms

      Switching signal
      Switching signal QL1Output type (dependant on the adjusted threshold)
      Switching signal QL2Output type (dependant on the adjusted threshold)
      Measuring valueCounting value
      • 1) SIO Direct: sensor operation in standard I/O mode without IO-Link communication and without using internal sensor logic or time parameters (set to "direct"/"deactivated").
      • 2) SIO Logic: Sensor operation in standard I/O mode without IO-Link communication. Sensor-internal logic or timing parameters plus Automation Functions used.
      • 3) IOL: Sensor operation with full IO-Link communication and usage of logic, timing and Automation Function parameters.
    • Diagnosis
      Device statusYes
    • Classifications
      eCl@ss 5.027270904
      eCl@ss 5.1.427270904
      eCl@ss 6.027270904
      eCl@ss 6.227270904
      eCl@ss 7.027270904
      eCl@ss 8.027270904
      eCl@ss 8.127270904
      eCl@ss 9.027270904
      eCl@ss 10.027270904
      eCl@ss 11.027270904
      eCl@ss 12.027270903
      ETIM 5.0EC002719
      ETIM 6.0EC002719
      ETIM 7.0EC002719
      ETIM 8.0EC002719
      UNSPSC 16.090139121528

    Technical drawings

    Connection type
    Connection diagram Cd-367
    Characteristic curve WTB12-3, red light, 350 mm
    Sensing range diagram WTB12-3, red light, 350 mm
    Dimensional drawing WTB12-3, IO-Link
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