Thermocouples
5.3 Compensation for the reference junction temperature
Analog value processing
84 Function Manual, 06/2014, A5E03461439-AC
Compensation with internal reference junction
Function principle
The reference junction for compensation via internal reference junction is at the terminals of
the analog input module. Wire the thermocouples or compensating lines directly to the
module inputs. The internal temperature sensor acquires the module temperature and
returns a compensating voltage.
Note that compensation via internal reference junction will not always reach the precision of
external compensation!
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 "Inputs/Measuring" area.
5. Select the "Thermocouple" value as "Measurement type".
6. As "Reference junction", select the value "Internal reference junction".
Figure 5-2 Internal reference junction
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