Siemens SIMATIC Distributed I/O ET 200eco PN Operating Instructions Manual page 51

Wiring
3.6 Pin assignment of connectors
Pin
3-conductor
1
2
3
5
2-conductor
1
3
5
①
4- or 5-core shielded copper cable
②
3-, 4-, or 5-core shielded copper cable
Pin
1
2
3
52
Assignment of X2, X4, X6, X8 (for RTD)
Constant current line positive I
Measurement cable positive M
Measurement cable negative M
current line negative I -
Cn
Functional earth FE
Measurement cable positive M
current line positive I +
Cn
Measurement cable negative M
current line negative I -
Cn
Functional earth FE
Assignment X2, X4, X6, X8
(for thermocouples and ±80 mV)
Not used
Connector X2: Input signal M
Connector X4: Input signal M
Connector X6: Input signal M
Connector X8: Input signal M
Not used
View of the cable connector
(wiring side)
+
Cn
+
n
- and constant
n
+ and constant
n
- and constant
n
View of the cable connector
(wiring side)
+
4
+
5
+
6
+
7
Operating Instructions, 06/2022, A5E01250250-AN
ET 200eco PN