Siemens SIMATIC Distributed I/O ET 200eco PN Operating Instructions Manual page 247

Connection examples
D.2 Connection of thermocouples to the analog inputs
below. In practice, different connection variants may be possible due to the conditions on
site.
Connection example "No" compensation as reference junction
①
②
③
Figure D-2 Connection example "No" compensation as reference junction
Connection example "Internal" compensation or "Fixed reference temperature" as reference
junction
①
②
Figure D-3 Connection example "Internal" compensation or "Fixed reference temperature" as reference
junction
248
Copper cables
e. g. compensating box (per channel); thermocouple type B does not need a compensating box
Thermocouple
Direct connection of the thermocouple or with compensating lines
Thermocouple
Operating Instructions, 06/2022, A5E01250250-AN
ET 200eco PN