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.
For a description of tthe meaning of the LEDs, please refer to the Displays
Ä
Chapter
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
Ä
Chapter 1.5.3.1.2.6 “Parameterization”
on page 618
Ä
Chapter 1.5.3.1.2.9 “Measuring Ranges” on page 625:
Pt100 -50 °C...+400 °C 2-wire configuration, 1
channel used
Pt1000 -50 °C...+400 °C 2-wire configuration, 1
channel used
Ni1000 -50 °C...+150 °C 2-wire configuration, 1
channel used
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".
I/O Modules > Digital/Analog I/O Modules
2019/04/173ADR010121, 13, en_US608
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