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
through them to build the necessary voltage drop for the evaluation. For this, the module CI541-
DP provides a constant current source which is multiplexed over the max. 4 analog input chan-
nels.
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
The following measuring ranges can be configured
Ä
Chapter 1.7.5.1.7 “Parameterization”
on page 960:
Pt100 -50 °C...+400 °C 2-wire configuration, 1
channel used
Pt1000 -50 °C...+400 °C 2-wire configuration, 1
channel used
Ni1000 -50 °C...+150 °C 2-wire configuration, 1
channel used
The function of the LEDs is described under Diagnosis and displays / Displays
Ä
Chapter
1.7.5.1.9 “State LEDs” on page 970.
The module CI541-DP performs a linearization of the resistance characteristic.
To avoid error messages from unused analog input channels, configure them as "unused".
Connection of Resistance Thermometers in 3-wire Configuration to the Analog Inputs
When resistance thermometers (Pt100, Pt1000, Ni1000) are used, a constant current must flow
through them to build the necessary voltage drop for the evaluation. For this, the module CI541-
DP provides a constant current source which is multiplexed over the max. 4 analog input chan-
nels.
The following figure shows the connection of resistance thermometers in 3-wire configuration to
the analog inputs AI0 and AI1. Proceed with the analog inputs AI2 and AI3 in the same way.
Communication Interface Modules (S500) > PROFIBUS
2019/04/17 3ADR010121, 13, en_US 951
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