Connection And Wiring; Internal Structure - Siemens SITRANS TW 7NG3242 Betriebsanleitung

Hardware functions
3.7.2

Connection and wiring

The U/I input plug must be mounted on the input plug (terminal 1-4) of the
SITRANS TW as shown in figure 9.
Sensor
Figure 9
The hardware parameterization must be done as follows:
Voltage (-1.2 to 10 V)
current (-12 to 100 mA)
3.7.3

Internal structure

A voltage divider (R1, R2) is used in the U/I input plug to adapt the measuring
voltages (-1.2 to 10 V) to the input measuring range of the SITRANS TW and a
current shunt (R3) to adapt the measuring currents (-12 to 100 mA).
The circuit diagram of the U/I input plug is shown in figure 10.
U+
U-
I+
I-
Figure 10 Circuit diagram U/I input plug
96
U+
A
U-
B
I+
C
I-
U/I input plug
7NG3092-8AV
Connection of U/I input plug to SITRANS TW
Measuring range
R3
10R / 0.1%, 15ppm
4
4
3 3
2
2
1
1
Input plug (terminal 1-4)
from SITRANS TW
7NG3242-0***0
Jumper position
A-B
B-C (default)
R1
996k / 0.1%, 25ppm
A
B
C
R2
100k / 0.1%, 15ppm
4
3
2
1
SITRANS TW
A5E00054075-05