ABB AC500 PLC - Connection of Resistance Thermometers in 2-wire Configuration

1.0
I0-
1.1
I0B
1.8
UP
1.9
ZP
PTC
2.0
I0+
2.1
I0A
2.8
UP
2.9
ZP
UP
ZP
Fig. 50: Connection example
The following operating mode can be configured Ä Chapter 1.5.2.2.2.6 “Parameterization”
on page 489 :
Digital input 24 V 1 channel used
Effect of incorrect input ter-
minal connection
Wrong or no signal detected,
no damage up to 35 V
For a description of the function of the LEDs, please refer to Diagnosis and displays / displays
Ä Chapter 1.5.2.2.2.7 “Diagnosis” on page 493.
Connection of Resistance Thermometers in 2-wire Configuration
When resistance thermometers (Pt100, Pt1000, Ni1000, Cu50) are used, a constant current
must flow through them to build the necessary voltage drop for the evaluation. For this, the
module AI531 provides a constant current source which is multiplexed over the 4 analog chan-
nels.
UP
ZP
1.0
I0-
1.1
I0B
1.8
UP
1.9
ZP
PTC
2.0
I0+
2.1
I0A
2.8
UP
2.9
ZP
Pt100
Pt1000
Ni1000
Cu50
Fig. 51: Connection example
The following measuring ranges can be configured Ä Chapter 1.5.2.2.2.6 “Parameterization”
on page 489:
Device Specifications
I/O Modules > Analog I/O Modules
2019/04/173ADR010121, 13, en_US482