153
2020/09
8.8.2 Wiring diagram
The terminal assignment depends on the sensor type.
Fig. 148: Connection options
NOTE
Open inputs or unused channels should not be parameterized in the operation mode PT/
NI or R because this parameterization can cause marginal measurement errors in adjacent
channels.
Should this though be is necessary due to the application, the respective channels have to
be terminated with a resistor. theresistor value has to lie within the parameterized range.
The sensor is fed from the same source as U
L
of the BL20 sys-
tem. The sensor and U
L
of the BL20 system are automatically
on the same GND potential.
Fig. 149: 4-wire-sensor (U/I)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
I +
I
é
I +
I
é
+
+
I +
I
é
I +
I
é
+
+
I +
I
é
I +
I
é
+
+
I +
I
é
I +
I
é
+
+
1
2
3
4
5
6
7
8
PT/NIU/I
2-Leiter 2-Leiter 3-Leiter
1
2
3
4
AI +
AI –
GND
24 VDC
15
16
U
L
GND
L
U
SYS
GND
SYS
E-8AI
BL20-Gateway
Analog
sensor
U
L
IN
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