UP
ZP
1.0
I0-
1.1
I1-
1.8
UP
1.9
ZP
PTC
2.0
I0+
2.1
I1+
2.8
UP
2.9
ZP
Pt100
Pt1000
Ni1000
Fig. 26: Connection example
If several measuring points are adjacent to each other, the return line is neces-
sary only once. 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).
The constant current of one channel flows through the resistance thermometer. The constant
current of the other channel flows through one of the cores. The module calculates the meas-
ured value from the two voltage drops and stores it under the input with the higher channel
number (e.g. I1).
In order to keep measuring errors as small as possible, it is necessary to have all the involved
conductors in the same cable. All the conductors must have the same cross section.
The following measuring ranges can be configured
Chapter 1.6.2.2.2.6 “Parameterization”
Pt100
-50 °C...+70 °C
3-wire configuration, two
channels used
Pt100
-50 °C...+400 °C
3-wire configuration, two
channels used
Pt1000
-50 °C...+400 °C
3-wire configuration, two
channels used
Ni1000
-50 °C...+150 °C
3-wire configuration, two
channels used
The function of the LEDs is described under Displays
Chapter 1.6.2.2.2.7 “Diagnosis”
The module AI523 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".
Device specifications
I/O modules > Analog I/O modules
2022/01/31
3ADR010278, 3, en_US
438