150 Calibrating 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
Preset values can be optimized
Approximate default values have already been determined for the various sensor
types, and these are stored when the item is delivered. However, these values
can be optimized
Table 151: Temperatures for Adjustments
Optimized Temperature for
Offset Adjustment
Optimized Temperature for Gain
Adjustment
~Cold junction temperature
(register 2)
~Max. FSV (full scale value)
~Min. FSV (full scale value)
~Max. FSV (full scale value)
For calibrating the offset value (for TCs), a value can be set on the calibrator at
which no voltage occurs at the clamping point. That is typically the cold junction
temperature. However, a value at which the sensor itself does not yet provide
any appreciable voltage (e.g., 600 °C for B types) can be used.
In the event that WAGO-I/O-CHECK cannot be used, the following must be
observed:
CODESYS library
The WAGO “ModuleAccess_01.lib” library allows you both to configure I/O
modules and to access their process data within a CODESYS project without the
use of WAGO-I/O-CHECK.
A function block can be used to perform user calibration. You can download the
library from the WAGO website.
Figure 38: Simplified Signal Sequence in the RTD/TC Module
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