Siemens SIMATIC ET 200eco PN Operating Instructions Manual page 248

Connection examples
D.2 Connection of thermocouples to the analog inputs
Connection example "RTD (0)" as reference junction
● With M12 compensation connector (integrated resistance thermometer Pt1000)
①
②
③
Figure D-4
● With external resistance thermometer Pt1000
①
②
③
Figure D-5
248
Direct connection of the thermocouple or with compensating lines
M12 compensation connector (terminals 1 and 3 assigned with internal Pt1000) only on
round socket X1. The comparison value of the M12 compensation connector at round socket
X1 also applies to thermocouples at X2, X3, X4, X5, X6, X7 and X8.
Thermocouple
Connection example "RTD (0)" as reference junction in M12 compensation connector
M12 connector only on round socket X1
External Pt1000 (α = 0.003851) in the area of the reference junction with copper cables at
terminals 1 and 3. The comparison value of the external Pt1000 at round socket X1 also
applies to thermocouples at X2, X3, X4, X5, X6, X7 and X8.
Thermocouple
Connection example "RTD (0)" as reference junction with external Pt1000
Operating Instructions, 08/2016, A5E01250250-AJ
ET 200eco PN