Power factor register format

The meter provides power factor values in a variety of formats to suit your energy management software.

Power factor in IEC and lead/lag (IEEE) formats: Float32 and Int16U registers

The meter provides total power factor in IEC and lead/lag (IEEE) formats in both Float32 and Int16U data types. You can use these registers to bring power factor information into third-party software. These registers are interpreted using the standard IEC and IEEE sign conventions.

NOTE: For information on how to calculate actual power factor values from the values in Int16U registers, see your meter’s Modbus register list, available from .

Four quadrant power factor information: floating point registers

The meter also provides PF information (including sign and quadrant) in single floating point registers for each of the PF values (for example, per-phase and total values for true and displacement PF, and associated minimums and maximums). The meter performs a simple algorithm to the PF value then stores it in the appropriate PF register.

The meter and software (such as Power Monitoring Expert or ION Setup ) interpret these PF registers for reporting or data entry fields according to the following diagram:

The PF value is calculated from the PF register value using the following formulas:

Quadrant PF range PF register range PF formula
Quadrant 1 0 to +1 0 to +1 PF value = PF register value
Quadrant 2 -1 to 0 -1 to 0 PF value = PF register value
Quadrant 3 0 to -1 -2 to -1 PF value = (-2) - (PF register value)
Quadrant 4 +1 to 0 +1 to +2 PF value = (+2) - (PF register value)

Go to and search for your meter’s Modbus register list to download a copy.

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