86 Commissioning
WAGO-I/O-SYSTEM 750
750-450 4 AI RTD
Manual
Version 1.2.0
7.1.1.3.4 Application Example of Scaling
•
Example using the "Pt100 (IEC 751)" setting
A description of how you can calculate the scaled process value is given
below. The equation for calculating the scaled process value using the
"Sensor type Pt100 (IEC 751) " setting in the standard format, with the
corresponding variables is:
((Unscaled process value × Gain multiplier) / 256) + Scaling offset = scaled
process value in °C
Example:
((20 °C × 512) / 256) + 20 = 60 °C
Refer to the table below for more sample calculations for the sensor type Pt100
(IEC 751) in the standard format.
Table 67: Examples of Scaled Process Value, Standard Format, Pt100 (IEC 751)
Gain multiplier Scaling offset
in °C
Scaled process value
at 20 °C*
at 30 °C*
at 40.2 °C*
256 (1**)
0
20 °C
30 °C
40.2 °C
256 (1**)
10
30 °C
40 °C
50.2 °C
384 (1.5**)
15
45 °C
60 °C
75.3 °C
512 (2**)
20
60 °C
80 °C
100.4 °C
640 (2.5**)
20
70 °C
95 °C
120.5 °C
*) unscaled process value
**) Multiplier (= gain multiplier/gain divisor)
Refer to the table below for more sample calculations for the sensor type Pt100
(IEC 751) in the
S5-FB250 format.
Table 68: Examples of Scaled Process Value, S5-FB250 Format, Pt100 (IEC 751)
Gain multiplier Scaling offset
in °C
Scaled process value in Ohm
at 20 °C*
at 30 °C*
at 40.2 °C*
256 (1**)
0
20 °C
30 °C
40 °C
256 (1**)
10
30 °C
40 °C
50 °C
384 (1.5**)
15
45 °C
60 °C
75.5 °C
512 (2**)
20
60 °C
80 °C
100.5 °C
640 (2.5**)
20
70 °C
95 °C
120.5 °C
*) unscaled process value
**) Multiplier (= gain multiplier/gain divisor)
