Connecting Thermocouples To Analog Inputs - Siemens ET 200pro Operating Instructions Manual

Appendix
A.5 Connection examples
A.5.6

Connecting thermocouples to analog inputs

Introduction
The 4 AI TC High Feature analog electronic module offers various options in terms of
compensating for the reference junction temperature. The connection examples reflecting
these are shown below. Other types of connection may also be possible in practice,
depending on local conditions.
Connection example based on "No" compensation as the reference junction
①
②
③
Figure A-39
Connection example based on "Internal" compensation or "Fixed ref. temp." as the reference junction
①
②
Figure A-40
520
Copper cables
E.g. compensating box (per channel); type B thermocouple does not need a compensating box
Thermocouple
Connection example based on "No" compensation as the reference junction
Connecting the thermocouple directly or using compensating lines
Thermocouple
Connection example based on "Internal" compensation or "Fixed ref. temp." as the
reference junction
ET 200pro distributed I/O system
Operating Instructions, 03/2013, A5E00335544-08