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ION 7550/7650 Digital Inputs' Resistance

Issue
User is looking for the integrated digital inputs' (S1-S8) resistance for the PowerLogic ION 7550/7650 meter. This data 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 could be much higher and still trigger the input.
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