GE VersaPoint IC220PBI002, User Manual

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GFK-1911B Chapter 5 Power for the Station 5-11
5
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 24V supply using a
power terminal. During this process the 24V power supply units must not be
connected to one another. One method of electrical isolation using a power
terminal is illustrated below. Connection between the ground of a supply voltage
(U
S
or U
M
) and functional earth ground should only be made at one point within the
station (point A). If a number of grounds are connected to the functional earth
ground, the electrical isolation is lost.
Profibus NIU I/O Power Terminal
IC220PWR001 I/O
( A )
Electrically isolated areas within the station:
1 Bus logic of the station
2 Isolated I/O
3 Isolated I/O