5 Designing the Power Supply System
5 - 14
NX-series EtherCAT Coupler Unit User’s Manual (W519)
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
the power supply systems are to be separated and then perform similar calculations to design the over-
all system to meet the power supply conditions.
Unlike supplying power from the NX bus, there is no specific design method for supplying I/O power
from external sources.
Calculate the total current consumption from the I/O power supply for the NX Units to be supplied
power from an external source.
Refer to the user’s manuals of the NX Units for the total current consumption from the I/O power supply.
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
5-3-3 Designing the I/O Power Supply from External Sources
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