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7280 Fiches technique(PDF) 41 Page - PHOENIX CONTACT

No de pièce 7280
Description  Inline Block IO Module for INTERBUS With 4 Analog Inputs and 2 Analog Outputs
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Fabricant  PHOENIX [PHOENIX CONTACT]
Site Internet  http://www.phoenixcontact.com
Logo PHOENIX - PHOENIX CONTACT

7280 Fiches technique(HTML) 41 Page - PHOENIX CONTACT

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ILB IB AI4 AO2
7280_en_02
PHOENIX CONTACT
41
22.2
Connection Method
RTD 4-Wire Connection
The contact resistance of the connections and the cable
resistances have virtually no effect due to the 4-wire
connection technology.
Figure 19
RTD 4-wire connection
22.3
RTD 3-Wire Connection
With 3-wire technology, the effect of the cable resistance on
the measured result in the terminal is minimized by multiple
measuring of the temperature-related voltage and
corresponding calculations. With this connection method,
one cable can be eliminated.
Figure 20
RTD 3-wire connection
RTD 2-Wire Connection With Connector Compensation
2-wire technology is a more cost-effective connection
method. The long U+ and U- cables to the sensor are no
longer needed here. They are jumpered directly at the
connector. The temperature-related voltage is not directly
measured at the sensor and therefore not falsified by the
two cable resistances RL. This connection method is ideal
for sensors with high R0 (e.g., Pt 1000, Ni 1000).
With 2-wire connection with connector compensation,
minimized tolerances can be achieved through:
Parameterization of the terminal on a 4-wire
connection
Direct jumpering of the U+ and U- connections at the
live measuring cables
A larger conductor cross section and sensors with higher
R0 further improve the tolerances of these connection
versions.
Figure 21
RTD 2-wire connection
with connector compensation
1
2
1
2
3
4
1
2
3
4
I+ RES
I- RES
U- U+
RTD
R
L
I+
I-
7285A018
U- (I = 0 µA)
R
L
U+ (I = 0 µA)
1
2
1
2
3
4
1
2
3
4
I+ RES
I- RES
U- U+
RTD
R
L
R
L
I+
I-
7285A017
U- (I = 0 µA)
1
2
1
2
3
4
1
2
3
4
I+ RES
I- RES
U- U+
RTD
R
L
I+
I-
7280B011
R
L


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