
NOTICE!
Risk of faulty measurements!
The negative pole/earthing potential at the sensors must not have too large a
potential difference with respect to ZP (max.
±
1 V within the full signal range).
Make sure that the potential difference never exceeds
±
1 V.
CAUTION!
The process supply voltage must be included within the earthing concept of the
plant (e. g. earthing of the minus pole).
The module provide several diagnosis functions
Chapter 1.7.3.1.8 “Diagnosis” on page 848
.
The measuring ranges are described in the section Measuring Ranges
“Parameterization” on page 842
Chapter 1.7.3.1.10 “Measuring Ranges” on page 851
The function of the LEDs is described in the section State LEDs
Connection of Resistance Thermometers in 2-wire Configuration
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 CI511-
ETHCAT provides 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.
1.0
1.1
1.8
1.9
AI0+
AI1+
UP
ZP
UP
ZP
PTC
1.5
AI–
1
Fig. 160: Connection of resistance thermometers in 2-wire configuration
1
Pt100 (2-wire), Pt1000 (2-wire), Ni1000 (2-wire); 1 analog sensor requires 1 channel
Device Specifications
Communication Interface Modules (S500) > EtherCAT
2019/04/17
3ADR010121, 13, en_US
832