ABB AC500 PLC Hardware Manual page 608

Device Specifications
I/O Modules > Digital/Analog I/O Modules
For a description of tthe meaning of the LEDs, please refer to the Displays
1.5.3.1.2.8 "State LEDs" on page 625 chapter.
Connection of Resistance Thermometers in 2-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 2-wire configuration to
the analog input AI0. Proceed with the analog inputs AI1 to AI3 in the same way.
Fig. 94: Connection of resistance thermometers in 2-wire configuration to the analog inputs
The following measuring ranges can be configured
on page 618
Pt100
Pt1000
Ni1000
For a description of the function of the LEDs, please refer to Diagnosis and displays / Displays
Ä Chapter 1.5.3.1.2.8 "State LEDs" on page 625.
The module DA502 performs a linearization of the resistance characteristic.
To avoid error messages from unused analog input channels, configure them as "unused".
608
NOTICE!
Risk of influences to the connected sensors!
Some sensors may be influenced by the deactivated module outputs of DA502.
Connect a 470 W / 1 W resistor in series to inputs DC16/DC17 if they are used
as fast counter inputs to avoid any influences.
Ä Chapter 1.5.3.1.2.9 "Measuring Ranges" on page 625:
-50 °C...+400 °C
-50 °C...+400 °C
-50 °C...+150 °C
3ADR010121, 13, en_US
Ä Chapter
Ä Chapter 1.5.3.1.2.6 "Parameterization"
2-wire configuration, 1
channel used
2-wire configuration, 1
channel used
2-wire configuration, 1
channel used
2019/04/17