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IB IL 24 MUX MA-PAC
34
PHOENIX CONTACT 5981_en_06
Electrical isolation: Other Other electrical isolation depends on how the supply voltages are provided. For instance,
electrical isolation can be provided by inserting a new 24 V supply using a power terminal.
During this process the 24 V power supply units on the low voltage side must not be
connected to one another.
One method of electrical isolation using a power terminal is illustrated in Figure 4-6.
Connection between the ground of a supply voltage (U
MUX
, U
S
or U
M
) and functional earth
ground must only be made at one point within the station (point A). Electrical isolation is lost
if several grounds are connected to functional earth ground.
Figure 4-6 Creating electrical isolation
Electrically isolated areas within the station:
1 Bus logic of the complete field multiplexer station
2 I/O (outputs)
3 I/O (inputs)
1 2 1 2 1 2 1 2
2
1 2 1 2 1 2 1 2
3
1 2 1 2 1 2
ST
CE
UL
RE
LE
US
UM
MUX
+
-
+
-
1 2
UM
PWR IN
+
-
A
1
IBS IL 24 MUX MA-PAC IB IL 24 PWR IN-PAC
DO DI
5981B010
1 2
U
MUX
U /U
M S
U /U
M S