Siemens 6ES7134-4JB00-0AB0 Manual page 30

Connecting
5.2 Connecting thermocouples
Compensation by means of a resistance thermometer at the 2AI RTD
If thermocouples that are connected to the inputs of the 2AI TC have the same reference
junction, compensate by means of a 2AI RTD.
For both channels of the 2AI TC module, you can select "RTD" or "None" as the reference
junction. If you select "RTD," the same reference junction (RTD channel) is always used for
both channels.
Figure 5-1
30
Compensation by means of the 2AI RTD
2AI TC ST analog electronic module (6ES7134-4JB00-0AB0)
Manual, 04/2007, A5E01076883-01