USER HANDBOOK 1.2 | B-PRIMIS DC/ET PRIME 2110W X C, 2115WUX C
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270011X00_B-PRIMIS_ET-DC-PRIME 2110W-2115W_EN.docx
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5.2.5. Analogue inputs (DC2115WUX CM / DC2110W X CM)
Basic considerations for analogue inputs
An analogue input channel always consists of two connections: AI (U) or AI (U/T) and AGND.
The AI (U/T) channels can either measure voltages (U) or evaluate PT100(0) sensors.
The AI (U) channels can measure voltages or be used for compensation of the line resistances
for PT100(0) measurements (3-wire measurement).
The Earth/Ground/GND lead of a voltage sensor or temperature sensor connected to an ana-
logue input may be connected only to AGND (not to GND or PE (equipotential)).
Different AGNDs (such as on a terminal strip) may not be connected together.
AGNDs may not be connected to the general GND of the control panel or to the "M" on the con-
trol unit (GND and AGND are already connected within the control unit, via a special filter).
AGNDs may not be connected directly to the equipotential bonding conductor (PE) of the ma-
chine or system.
Long cables and wires with a small cross-section lead to voltage drops and deviations in
PT100(0) measurements (due to resistance of the lead). These unavoidable deviations must be
taken into account when planning the wiring.
To avoid interference, analogue I/O wires must be kept separate from digital signals and power
cables.
Screened cables are advisable for all analogue I/Os. The screen is maintained from the respec-
tive sensor or instrument through into the control panel or close to the control unit.
The following counterparts have been tested with the S2C-SMT 3.5 (Weidmüller) connector and are
approved for use with the device:
Weidmüller B2CF 3.50/06/180(F) SN BK
Fig. 22: Analogue inputs X2
Analogue inputs X2
Pin Assignment
Pin
Assignment
1
AI1 (U/T)
2
AI3 (U/T)
3
AGND
4
AGND
5
AI2 (U)
6
AI4 (U)