Download IB IL MUX UM E Order No.

Power supplies and voltage concept
Option 1
The field multiplexer supply UMUX and the I/O supply UM/US are provided from separate
power supplies.
Local bus
UL+
UANA
UL- (GNDMUX)
mC
1
4
5V
5V
24 V
1
+24 V (UM)
co
s.
3
ne
UMUX
(UL / UANA)
UM / US
Power
supply 1
Power
supply 2
5981B015
Electrical isolation in the field multiplexer (separate power supplies)
om
Potential areas:
Area of remote bus cable
Area of functional earth ground (FE) capacitive for shield
Area of functional earth ground (FE)
μC
on
l
in
ec
3
+24 V (US)
po
Figure 5-3
nt
Remote bus
2
5
2
2
1
24 V
m
24 V
7.5 V
4
Area of the field multiplexer supply UMUX from which the communications power UL
and supply for the analog terminals UANA are generated.
5
Area of the I/O voltages UM and US
Symbols used:
Microcontroller
Converter
1
Optocoupler
Electrically isolated area
Supply unit with electrical isolation
2
Reference potential GNDDATA (remote bus cable)
Reference potential GNDMUX (field multiplexer supply)
Shield potential; connected with a capacitor to FE of the
potential jumper
This isolation can also be achieved if the power supply UM/US is provided through a
separate power terminal with its own power supply (see page 5-8) instead of through the
power terminal integrated into the field multiplexer.
5981_en_02
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