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    ION7550/7650 digital input resistance

    Issue
    The user is looking for the integrated digital inputs (S1-S8) resistance for the PowerLogic ION7550/7650 meters. This information is not found in the meter’s datasheet.

    Product Line
    PowerLogic ION7550 and ION7650 series power meter

    Environment
    Advanced metering offer

    Cause
    A customer may require the digital input resistance of the ION7650 meter to be incorporated in technical design data.

    Resolution

    Using internal excitation, the digital inputs are guaranteed to be open (not triggered) when they are presented with:
    Guaranteed Open - 1 Mohm or greater external resistance for internal excitation between SCOM and S[n].
     
    Using internal excitation, the digital inputs are guaranteed to be closed (triggered) when they are presented with:
    Guaranteed Closed - 20 kohm or less external resistance for internal excitation between SCOM and S[n].
     
    The above values are the guaranteed resistance. In practice, the actual resistance can be much higher and still trigger the input.

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