CAUTION!
Risk of influences to the connected sensors!
Some sensors may be influenced by the deactivated module outputs of CI592-
CS31.
If using inputs as Fast Counter inputs, connect a 470 W / 1 W resistor in series
to configurable inputs/outputs DC8/DC9.
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
to build the necessary voltage drop for the evaluation. For this, the module CI592-CS31 pro-
vides a constant current source which is multiplexed over the 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. 147: Connection of resistance thermometers in 2-wire configuration to the analog inputs
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
The measuring ranges are described in the section Measuring Ranges
Ä
Chapter 1.7.2.2.8
“Parameterization” on page 794
Ä
Chapter 1.7.2.2.11 “Measuring Ranges” on page 802:
The module CI592-CS31 performs a linearization of the resistance characteristic.
Configure unused analog input channels as "unused".
Communication Interface Modules (S500) > CS31
2019/04/173ADR010121, 13, en_US784
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