ABB AC500 V3 Hardware Manual page 738

Device specifications
Communication interface modules (S500) > Modbus
Fig. 139: Connection of resistance thermometers in 2-wire configuration to the analog inputs
The following measuring ranges can be configured
on page 749 and
Pt100
Pt100
Pt1000
Ni1000
The function of the LEDs is described under Diagnosis and displays / Displays
1.7.4.1.8 "Diagnosis and state LEDs" on page 755.
The module CI521-MODTCP 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 CI521-
MODTCP 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 3-wire configuration to
the analog inputs AI0 and AI1. Proceed with the analog inputs AI2 and AI3 in the same way.
738
Ä Chapter 1.7.4.1.9 "Measuring ranges" on page 761:
-50 °C...+70 °C
-50 °C...+400 °C
-50 °C...+400 °C
-50 °C...+150 °C
3ADR010278, 3, en_US
Ä Chapter 1.7.4.1.7 "Parameterization"
2-wire configuration, 1
channel used
2-wire configuration, 1
channel used
2-wire configuration, 1
channel used
2-wire configuration, 1
channel used
Ä Chapter
2022/01/31