Thermocouples
5.3 Compensation for the reference junction temperature
Analog value processing
88
Function Manual, 06/2014, A5E03461439-AC
5.3.4
Compensation, reference channel of Group 0
Function principle
For this compensation, a module channel with a connected thermal resistor (RTD) acts as
"Reference temperature transmitter". Other channels (reference temperature receivers) with
connected thermocouples can be compensated using this reference temperature. The
measured temperatures of all channels (receivers) that you have configured for this
compensation type will be compensated automatically by the temperature value of the
reference junction (transmitter).
The reference junction temperature is determined by means of an external thermal resistor
(RTD).
Procedure
Configuration steps:
1.
Open the project in STEP 7.
2.
In the device view, select the required analog module and the corresponding channel.
3.
Select the "General" tab in the Inspector window of the selected module.
4.
Select the area "Inputs/measurement".
5.
For the channel of the relevant module, specify as transmitter:
As "Measurement type" select, for example, "Thermal resistor (4-wire connection)".
As "Reference junction", select the value "Reference channel of group 0".
Figure 5-6
Transmitter: Reference channel of group 0
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