Siemens SIMATIC ET 200eco PN - Connection of thermocouples to the analog inputs

Connection examples
D.2 Connection of thermocouples to the analog inputs
ET 200eco PN
Operating Instructions, 08/2016, A5E01250250-AJ
247
D.2
Connection of thermocouples to the analog inputs
Introduction
Different options are available for the analog I/O device 8 AI RTD/TC 8xM12 for
compensation of the reference junction temperature. The corresponding connection
examples are shown below. In practice, different connection variants may be possible due to
the conditions on site.
Connection example "No" compensation as reference junction
①
Copper cables
②
e. g. compensating box (per channel); thermocouple type B does not need a compensating box
③
Thermocouple
Figure D-2 Connection example "No" compensation as reference junction
Connection example "Internal" compensation or "Fixed reference temperature" as reference junction
①
Direct connection of the thermocouple or with compensating lines
②
Thermocouple
Figure D-3 Connection example "Internal" compensation or "Fixed reference temperature" as
reference junction