Siemens ET 200pro - Connecting Thermocouples to Analog Inputs

Appendix
A.5 Connection examples
ET 200pro distributed I/O system
520 Operating Instructions, 03/2013, A5E00335544-08
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
Copper cables
②
E.g. compensating box (per channel); type B thermocouple does not need a compensating box
③
Thermocouple
Figure A-39 Connection example based on "No" compensation as the reference junction
Connection example based on "Internal" compensation or "Fixed ref. temp." as the reference junction
①
Connecting the thermocouple directly or using compensating lines
②
Thermocouple
Figure A-40 Connection example based on "Internal" compensation or "Fixed ref. temp." as the
reference junction