IB IL SGI 2/F ...
7210_en_02 PHOENIX CONTACT 10
9 Connection examples
9.1 6-wire connection (several strain gauge load cells per channel)
Figure 4 Connection of strain gauges in 6-wire technology
R
L
: Cable resistance
Channel 1: Connect the strain gauge to connector 1 using 6-wire technology. At connector 2 select the jumper supply level.
The terminal provides supply voltages of 5 V and 3.3 V. Connections +U
V
of connector 1 and +U
V
of connector 2 are
connected internally. At connector 2, connect either 5 V or 3.3 V to +U
V
. This supplies the 6-wire connection of channel 1
with power.
Channel 2: Connect the strain gauge to connector 3 using 6-wire technology. At connector 4 select the jumper supply level.
The terminal provides supply voltages of 5 V and 3.3 V. Connections +U
V
of connector 3 and +U
V
of connector 4 are
connected internally. At connector 4, insert a jumper to connect either 5 V or 3.3 V to +U
V
. This supplies the 6-wire
connection of channel 2 with power.
The IB IL SGI 2/F terminal can measure both unipolar and bipolar jumper differences. Observe the polarity
when connecting +U
d
and -U
d
.
If the analog terminal expects unipolar jumper differences, the signal excursion may be negative in the worst-
case scenario. The measured value would therefore always be 0. In this case, adapt the signal excursion to
the input voltage range by switching cables +U
d
and -U
d
.
If the analog terminal is set to a bipolar jumper difference, the signal excursion may be mixed up in the sign bit
in the worst-case scenario. In this case, adapt the signal excursion to the input voltage range again by switching
cables +U
d
and -U
d
.
Connections +U
0
and -U
0
are led back to a unipolar input. If the cables are mixed up, the terminal indicates a
configuration error.
U
V
U
0
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
12
Connector
Channel
7210D005
RR
RR
R
L
R
L
FE
GND
Uv
+U
V
+U
d
-U
d
U
d
RR
RR
R
L
R
L
FE
GND
Uv
+U
V
+U
d
-U
d
+U
0
-U
0
+U
0
-U
0
U
V
U
0
U
d
Strain gauge 1
Strain gauge 2
Channels 1 and 2 can be supplied with different supply voltages (5 V or 3.3 V).
