82 Process Image
WAGO-I/O-SYSTEM 750 XTR
750-495/040-00x 3-Phase Power Measurement Module 690 V
Manual
Version 1.2.0
5.6
Examples of the Calculation of the Measured Values
from the Process Values
The format of signed measured values (Int32) is the two’s complement.
In general, the following formula applies to the calculation of the measured
values from the process values:
Measured value = Process value × PI scaling factor
The scaling factor PI is defined for each measured value in the section
“Measured Value Collections.” Examples of the calculation follow:
Calculation of the measured values for voltage
Voltage
750-495/040-000,
750-495/040-002
750-495/040-001
Process value
0x000007D0 (2000)
0x00003D76 (15734)
PI scaling factor
0.01 V
0.01 V
Formula
Measured value = process value × PI scaling factor
Measured value for
voltage
20.00 V
157.34 V
Calculation of the measured values for frequency
Frequency
750-495/040-000,
750-495/040-002
750-495/040-001
Process value
0x0000C3B8 (50104)
0x0000EB9C (60316)
PI scaling factor
0.001 Hz
0.001 Hz
Formula
Measured value = process value × PI scaling factor
Measured value for
frequency
50.10 Hz
60.32 Hz
Calculation of the measured values for phase angle
Phase angle
750-495/040-000,
750-495/040-002
750-495/040-001
Process value
0x00004E3 (1251)
0x0000226E (8814)
PI scaling factor
0.01 degrees
0.01 degrees
Formula
Measured value = process value × PI scaling factor
Measured value for
phase angle
12.51 degrees
88.14 degrees