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5 Designing the Power Supply System
NX-series PROFINET Coupler Unit User’s Manual (W623)
5-3 Designing the IO Pow
er Supply System
5
5-3-2 Designing the IO Power Supply from the NX Bus

Maximum IO Power Supply Current
The maximum IO power supply current is the maximum current that the IO power supply that is con-
nected to the PROFINET Coupler Unit or Additional IO Power Supply Unit can supply through the
NX bus connectors to the NX Units. For the maximum IO power supply current of the PROFINET
Coupler Unit, refer to 3-1-3 PROFINET Coupler Unit Specifications on page 3-4. For the maximum
IO power supply current of the Additional IO Power Supply Unit, refer to the NX-series System Units
User’s Manual (Cat. No. W523).
The total current consumption from the IO power supply from the NX bus is the total of the following
current consumptions.
• The current consumption from the IO power supply that is required for the PROFINET Coupler Unit
or the Additional IO Power Supply Unit, and for the NX Units that are connected to the PROFINET
Coupler Unit or Additional IO Power Supply Unit
• The current consumption between the NX Units and the connected external devices
Calculating the Total Current Consumption from the IO Power Sup-
ply
Current consumption item Description
Current consumption from IO
power supply
This is the current that is consumed by the internal circuits that operate on
the IO power supply.
Specific values are given in the user’s manuals for individual Units.
●The total current consumption from the I/O
power supply must not exceed the
maximum current of the I/O power supply.
(NX Units that are supplied power from
external sources are not included in the
calculation.)
●The voltage drop in the I/O power supply
must be within the voltage specifications
of the I/O circuits of the NX Units and the
connected external devices.
NX Units
●The total current consumption
from the I/O power supply
must not exceed the
maximum current of the I/O
power supply.
●The voltage drop in the I/O
power supply must be within
the voltage specifications of
the I/O circuits of the NX
Units and the connected
external devices.
●The total current consumption
from the I/O power supply
must not exceed the
maximum current of the I/O
power supply.
●The voltage drop in the I/O
power supply must be within
the voltage specifications of
the I/O circuits of the NX
Units and the connected
external devices.
Additional I/O Power Supply Unit
NX Units
Additional I/O Power Supply Unit
NX Units
End Cover
To external
devices
To external
devices
To external
devices
To external
devices
I/O power
supply
Separating the I/O
Power Supply
•
The Additional I/O
Power Supply Unit is
used because
different I/O power
supply voltages are
used.
The Additional I/O Power
Supply Unit is used because
otherwise the maximum
current of the I/O power supply
would be exceeded.
I/O power
supply
I/O power
supply
terminals
I/O power
supply
terminals
I/O
power
supply
I/O
power
supply
Supplied from
external source.
I/O power
supply
I/O power supply
terminals
PROFINET
Coupler Unit