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WAGO-I/O-SYSTEM 750
750-489 4AI RTD/TC/Strain Gauge Ex i
Manual
Version 1.1.0, valid from FW Version 02
4.3.2.2 Resistance and Voltage Measurements
Figure 9: Process of Calculating Measured Value from Process Value – Resistance/Voltage
Measurements
This yields the following formulas for converting the local bus process value to
the measured value:
E.g., for a measurement range of ±30 mV
:
Standard format:
𝐔𝐔
(
𝐱𝐱
) =
𝒙𝒙
𝟐𝟐𝟐𝟐𝟏𝟏𝟏𝟏𝟏𝟏
∗ 𝟑𝟑𝟏𝟏
𝒎𝒎𝒎𝒎
S5-FB250 format:
𝐔𝐔
(
𝐱𝐱
) =
𝒙𝒙
/
𝟖𝟖
𝟐𝟐𝟐𝟐𝟏𝟏𝟏𝟏
∗ 𝟑𝟑𝟏𝟏
𝒎𝒎𝒎𝒎
E.g., for a measurement range of 4
kΩ
:
Standard format:
𝐑𝐑
(
𝐱𝐱
) =
𝒙𝒙
𝟐𝟐𝟐𝟐𝟏𝟏𝟏𝟏𝟏𝟏
∗ 𝟒𝟒𝟏𝟏𝟏𝟏𝟏𝟏
𝛀𝛀
S5-FB250 format:
𝐑𝐑
(
𝐱𝐱
) =
𝒙𝒙
/
𝟖𝟖
𝟐𝟐𝟐𝟐𝟏𝟏𝟏𝟏
∗ 𝟒𝟒𝟏𝟏𝟏𝟏𝟏𝟏
𝛀𝛀
E.g., for a measurement range strain gauge U
d
(±15 mV)
:
Standard format:
𝐔𝐔
(
𝐱𝐱
) =
𝒙𝒙
𝟐𝟐𝟐𝟐𝟏𝟏𝟏𝟏𝟏𝟏
∗ 𝟏𝟏𝟐𝟐
𝒎𝒎𝒎𝒎
S5-FB250 format:
𝐔𝐔
(
𝐱𝐱
) =
𝒙𝒙
/
𝟖𝟖
𝟐𝟐𝟐𝟐𝟏𝟏𝟏𝟏
∗ 𝟏𝟏𝟐𝟐
𝒎𝒎𝒎𝒎
E.g., for a measurement range strain gauge U
ref
(2.4 V)
:
Standard format:
𝐔𝐔
(
𝐱𝐱
) =
𝒙𝒙
𝟐𝟐𝟐𝟐𝟏𝟏𝟏𝟏𝟏𝟏
∗ 𝟐𝟐𝟐𝟐𝟏𝟏𝟏𝟏
𝒎𝒎𝒎𝒎
S5-FB250 format:
𝐔𝐔
(
𝐱𝐱
) =
𝒙𝒙
/
𝟖𝟖
𝟐𝟐𝟐𝟐𝟏𝟏𝟏𝟏
∗ 𝟐𝟐𝟐𝟐𝟏𝟏𝟏𝟏
𝒎𝒎𝒎𝒎
where x = (INT16)process value and U/R is a float/double!