Fig. 87: Connection of resistance thermometers in 2-wire configuration to the analog inputs
The following measuring ranges can be configured
Ä
Chapter 1.6.3.1.2.6 “Parameterization”
on page 599
Ä
Chapter 1.6.3.1.2.9 “Measuring ranges” on page 606:
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
For a description of the function of the LEDs, please refer to Diagnosis and displays / Displays
Ä
Chapter 1.6.3.1.2.8 “State LEDs” on page 606.
The module DA502 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 DA502
provides a constant current source which is multiplexed over max. 4 analog input channels.
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.
I/O modules > Digital/Analog I/O modules
2022/01/31 3ADR010278, 3, en_US 589
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