4.0
DO0
4.1
DO1
4.2
DO2
4.3
DO3
4.4
DO4
4.5
DO5
4.6
DO6
4.7
DO7
4.8
UP3
4.9
ZP
24 V DC
-
+
Fig. 102: Connection of configurable digital inputs/outputs to the module CI581-CN
Connection of resistance thermometers in 2-wire configuration to the analog inputs
When resistance thermometers (Pt100, Pt1000, Ni1000) are used, a constant current must flow
to build the necessary voltage drop for the evaluation. For this, the module CI581-CN provides a
constant current source which is multiplexed over the max. 4 analog input channels.
The following figure shows the connection of resistance thermometers in 2-wire configuration to
the analog input AI0. Proceed with the analog inputs AI1 to AI3 in the same way.
2.0
AI0+
2.1
AI1+
2.2
AI2+
2.3
AI3+
2.4
AI-
2.5
AO0+
2.6
AO1+
2.7
AO-
2.8
UP
3.9
ZP
24 V DC
-
+
Pt100
Pt1000
Ni1000
Fig. 103: Connection of resistance thermometers in 2-wire configuration to the analog inputs
Device specifications
Communication interface modules (S500) > CANopen
2022/01/31
3ADR010278, 3, en_US
631
