Omron NXEIP202 User Manual page 95

●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.
EtherNet/IP
Coupler Unit
I/O power supply
terminals
To external
I/O power
devices
supply
 Maximum I/O Power Supply Current
The maximum I/O power supply current is the maximum current that the I/O power supply that is
connected to the EtherNet/IP Coupler Unit or Additional I/O Power Supply Unit can supply through
the NX bus connectors to the NX Units. For the maximum I/O power supply current of the Ether-
Net/IP Coupler Unit, refer to 3-1-2 EtherNet/IP Coupler Unit Specifications on page 3-3. For the
maximum I/O power supply current of the Additional I/O Power Supply Unit, refer to the NX-series
System Units User's Manual (Cat. No. W523).
Calculating the Total Current Consumption from the I/O Power Sup-
ply
The total current consumption from the I/O power supply from the NX bus is the total of the following
current consumptions.
• The current consumption from the I/O power supply that is required for the EtherNet/IP Coupler Unit
or the Additional I/O Power Supply Unit, and for the NX Units that are connected to the EtherNet/IP
Coupler Unit or Additional I/O Power Supply Unit
• The current consumption between the NX Units and the connected external devices
Current consumption item
Current consumption from I/O
power supply
NX-series EtherNet/IP Coupler Unit User's Manual (W536)
●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
I/O power
To external
supply
devices
terminals
I/O I/O
I/O power
power power
supply
supply supply
Supplied from
The Additional I/O Power
external source.
Supply Unit is used because
otherwise the maximum
current of the I/O power supply
would be exceeded.
This is the current that is consumed by the internal circuits that operate on
the I/O power supply.
Specific values are given in the user's manuals for individual Units.
5 Designing the Power Supply System
●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 NX Units
I/O power
To external To external
supply
devices
terminals
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.
Description
End Cover
devices
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