148 Scaling Measured Values
WAGO-I/O-SYSTEM 750
750-489 4AI RTD/TC/Strain Gauge Ex i
Manual
Version 1.1.0, valid from FW Version 02
8
Scaling Measured Values
User scaling serves to adjust the process values.
When user scaling is used, the required accuracy of the process value resolution
is changed, but not fundamentally limited.
User scaling is optional.
The values for “Gain” and “Offset” are required in order to perform user scaling.
The scaling gain is the gain factor. The scaling offset is the offset on the y axis.
When these two values are input, the result is a scaled process value.
The following general scaling equation applies:
𝑦𝑦
2 =
𝑦𝑦
1 ×
�
𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺
[
𝑟𝑟𝑟𝑟𝑟𝑟𝐺𝐺𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟
𝑐𝑐𝑐𝑐𝐺𝐺𝑟𝑟𝑟𝑟𝐺𝐺𝑟𝑟
]
16384
�
+
𝑂𝑂𝑂𝑂𝑂𝑂𝑟𝑟𝑟𝑟𝑟𝑟
The variables have the following meanings:
Table 150: Variable Legend – Scaling Measured Values
Variable
Meaning/Function
y2
Scaled process value
y1
Unscaled process value
Gain [register content] Scaling gain (gain factor)
Offset
Scaling offset
16384
Constants (1/16384)
The y1 value (unscaled process value) serves as the input value for the user
scaling. If user scaling is switched off, the y1 value is carried over unchanged to
y2.
