Supply Of The Profibus-Dp Network Interface Unit - GE VersaPoint IC220PBI002 User Manual

5

Supply of the Profibus-DP Network Interface Unit

Logic and field power are distributed among VersaPoint I/O modules on several
dedicated power circuits.
These are:
The main power circuit (U
separately switchable from the main circuit. The main power circuit begins at
the power terminal integrated into the NIU. It may also include additional
Power Terminal modules as appropriate.
The segment voltage (U
a Power Terminal module, or at a Segment Terminal module. A 24V segment
circuit can be used to power I/O modules that must be separately switchable
from the main voltage. One or more segment circuits might be created for
discrete input modules without individual short-circuit protection, for discrete
output modules, and to control power switches and contactors.
Logic Voltage (U
provides communications power for all I/O modules in the station. This voltage
is not augmented by the addition of extra power terminals.
Analog Voltage (U
modules in the I/O Station. This voltage is not augmented by the addition of
extra power terminals.
Each of these power circuits is described in this section.
The main power U
Network Interface Unit. The main power generates internal voltages for the logic
circuit U and analog signals U
L
actuators.
NIU
5-2 VersaPoint™ I/O System Profibus-DP NIU User's Manual – August 2005
), which powers all modules that do not need to be
M
) is drawn from the main power circuit at the NIU, at
S
) is generated from the main power circuit at the NIU and
L
) is supplied by the NIU and used to power the analog
ANA
and the segment voltage U
M
. The segment voltage supplies the sensors and
ANA
Power Terminal
for the station are connected at the
S
Segment Terminal
GFK-1911B