ABB AC500 V3 Hardware Manual page 685

Pt100
Pt1000
Ni1000
The measuring ranges are described in the section Measuring Ranges
"Parameterization" on page 694
The module CI511-ETHCAT performs a linearization of the resistance characteristic.
In order to avoid error messages from unused analog input channels, it is useful to configure
them as "unused".
Connection of resistance thermometers in 3-wire configuration
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
CI511-ETHCAT 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.
Fig. 124: Connection of resistance thermometers in 3-wire configuration
1 Pt100 (3-wire), Pt1000 (3-wire), Ni1000 (3-wire); 1 analog sensor requires 2 channels
2 Twisted pair within the cable
3 Return line: The return line is only needed once if measuring points are adjacent to each
other. This saves wiring costs.
With 3-wire configuration, two adjacent analog channels belong together (e. g. the channels 0
and 1). In this case, both channels are configured according to the desired operating mode. The
lower address must be the even address (channel 0), the next higher address must be the odd
address (channel 1).
2022/01/31
-50 °C...+400 °C
-50 °C...+400 °C
-50 °C...+150 °C
Ä Chapter 1.7.3.1.10 "Measuring ranges" on page 703.
2
1
3
3ADR010278, 3, en_US
Communication interface modules (S500) > EtherCAT
2-wire configuration, 1
channel used
2-wire configuration, 1
channel used
2-wire configuration, 1
channel used
AI0+
AI1+
UP
ZP
Device specifications
Ä Chapter 1.7.3.1.7
1.0
1.1
1.5
AI–
PTC
1.8
UP
1.9
ZP
685