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Digital Input Signal Isolators
PHG-12TF-288 1 input and 2 outputs
PHG-22TF-2828  2 inputs and 2 outputs

Input: Switch contacts/proximity switches
Output: Transistor


    The switching input transistor output signal isolator converts the input signal from the switch contact or proximity switch into a transistor output through isolation. The line fault detection function is displayed by the LED light on the top of the module. The switch of the module is used to select the phase of the channel and whether the line fault detection function is required.
    This product needs to be powered independently, and the power supply, input and output terminals are isolated.


    Input signal Switch contacts/proximity switches
    The supply voltage of the sensor About 8V
    Input frequency range ≤5kHz
    Input/output characteristics:
    On site input current >2.1mA, the output is closed, indicating ON;
    When<1.2mA, the output is open circuit, indicating OFF
    Switched control between inverted phase and normal phase of outputs e-c When dial switch K1, K3 is at "ON" side,  the transistor output e-c are in inverted phase
    When dial switch K1、K3 is at "OFF" side, the transistor output e-c are in normal phase
    When dial switch K2、K4 is at "ON" side, the circuit selects indicating red light LFD alarm function.
    Output signal Transistor
    Output characteristic NPN type transistor emitter or collector open circuit output
    Drive capability Output current ≤ 20mA (1.2k Ω), maximum internal current 100mA, equipped with short-circuit current protection
    Basic parameters
    Supply voltage 20~35VDC
    Power consumption <1.2W (24V power supply, when the transistor is on) (PHG-12TF-288)
    <1.3W (24V power supply, when the transistor is on) (PHG-22TF-2828)
    LED indicator Green: Power indicator
    Yellow: Output transistor in normal working state
    Red: LFD indication, line fault alarm
    Temperature parameters Working temperature: -20℃ ~ +60℃,
    Storage temperature: -40℃ ~ +80℃
    Relative humidity 10%~95% RH no condensation
    Insulation strength ≥2000VAC/min (between input/output/power supply)
    Insulation resistance 100MΩ (500VDC )(between input/output/power supply)
    Electromagnetic compatibility GB/T 18268(IEC 61326-1)
    MTBF 80000h
    Wire requirements Horizontal cutting surface ≥ 0.5mm2; Insulation strength ≥ 500V
    Applicable field equipments Field equipment such as dry contacts or NAMUR type proximity switch inputs that comply with DIN19234 standard


    PHG-12TF-288 .jpg


    Connection wiring

    PHG-12TF-288 (1).jpg

    1. PHG-12TF-288 does not contain input 2 part
    2. The power supply of the power rail is an optional function. Users need to specify the power supply mode when ordering. Please refer to attachment on page 89.

    PHG-12TF-288 (2).jpg

    Line Fault Detection

    Users can select the "ON" side of the switch at the top of the module to enable fault detection function and indicate an alarm through the red LED light. On site input current>7mA, short circuit alarm (SC); On site input current<0.1mA, open circuit alarm (LB). If the switch contact input requires fault detection function (wire breakage, short circuit), a 22k Ω resistor should be connected in parallel at both ends of the switch, and a 680 Ω resistor should be connected in series (as shown in the wiring diagram for switch contact II).