Analog Input Modules
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154
The sensor and UL of the BL20 system are fed from different
sources. U
L
of the BL20 system and AI of the sensor must be on
the same GND-potential. For this, U
L
and AI must be bridged.
Fig. 150: 4-wire-sensor (U/I)
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. 151: 2-wire-sensor (U/I)
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
+
–
1
2
3
4
AI –
AI +
15
16
U
L
GND
L
U
SYS
GND
SYS
E-8AI
BL20-Gateway
Analog
sensor
U
L
IN
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