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5 Designing the Power Supply System
NX-series EtherNet/IP Coupler Unit User’s Manual (W536)
5-3 Designing the I/O Power Supply System
5
5-3-2 Designing the I/O Power Supply from the NX Bus
*1. The current consumption of the EtherNet/IP Coupler Unit is not actually 0 A. However, a value of 0 A is used
in this calculation example.
In actual calculations, use the current consumption from the I/O power supply that is given elsewhere in this
manual.
Outline
Find the I/O power supply voltage of the NX Unit that is the farthest from the EtherNet/IP Coupler
Unit. In this example, the I/O power supply voltage of Unit (7) is found.
Conditions
Assume that an I/O power supply voltage of 24.00 VDC is supplied to the I/O power supply terminals
on the EtherNet/IP Coupler Unit.
Procedure
1 Use the following formula to calculate the total current consumption from the I/O power supply.
2 Find the I/O power supply voltage and make sure that it is within the voltage specifications of the
I/O circuits of the NX Units and the connected external devices.
If the I/O power supply voltages of the connected external devices are different, connect an Additional
I/O Power Supply Unit at the point where the I/O power supply voltage changes and then perform simi-
lar calculations to design a system that meets the power supply conditions. The same method is used
to separate the power supply systems. Connect an Additional I/O Power Supply Unit at the point where
Total current consumption from the I/O power supply
=(1) + (2) + (3) + (4) + (5) + (6) + (7)
= 0 A + 1.5 A + 1.5 A + 0 A + 0 A + 0.5 A + 0.5 A
= 4 A
I/O power supply voltage at (7) = I/O power supply voltage on I/O power supply terminals − (Voltage drop per Unit ×
Number of Units passed through)
= 24.00 V − 0.08 V × (7 − 1 Units)
= 23.52 V
Design to Separate the I/O Power Supply
Example:
(1) (2) (2) (4) (5) (6) (7)
To external
devices
To external
devices
I/O power
supply
(24 VDC)
Power Consumption of Individual Units
(1): 0 A
*1
(Supplied from the NX bus.)
(2) and (3): 1.5 A each (Supplied from the NX bus.)
(4) and (5): 0 A (Supplied from external source.)
(6) and (7): 0.5 A each (Supplied from the NX bus.)
● Total current consumption from the Units
that are supplied I/O power from the
EtherNet/IP Coupler Unit (total for (1) to
(7) = 4 A)
● Units that are supplied I/O
power from the Additional I/O
Power Supply Unit
Additional I/O Power Supply Unit
EtherNet/IP Coupler
NX Units
End Cover
To external
devices
I/O power
supply
(24 VDC)
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