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

-2 to -1

PF value = (-2) - (PF register value)

Quadrant 3

0 to -1

-1 to 0

PF value = 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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