5 Designing the Power Supply System
5 - 10
NX-series EtherCAT Coupler Unit User’s Manual (W519)
Make sure that the following design conditions are met when you design the I/O power supply from the
NX bus.
• The total current consumption from the I/O power supply must not exceed the maximum I/O power
supply current of the Unit that supplies the I/O power.
• 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.
Use the following procedure to design the I/O power supply.
1
Calculate the total current consumption from the I/O power supply of the EtherCAT Coupler Unit
and the NX Units that are connected to the EtherCAT Coupler Unit, and calculate the voltage
drop in the I/O power supply.
2
If either of the following items (a) and (b) is true, add an Additional I/O Power Supply Unit to the
right of an NX Unit for which (a) and (b) are not true.
(a) The total current consumption for the I/O power supply exceeds the I/O power supply
capacity of the EtherCAT Coupler Unit.
(b) Voltage drop in the I/O power supply causes the voltage of the I/O power supply to go
below the voltage specifications of the I/O circuits of the NX Units or the connected
external devices.
3
Calculate the voltage drop in the I/O power supply after the Additional I/O Power Supply Unit
and the total current consumption from the I/O power supply that is required by the Additional
I/O Power Supply Unit and by the NX Units that are connected after the Additional I/O Power
Supply Unit.
If either of the following items (a) and (b) is true, add another Additional I/O Power Supply Unit
to the right of an NX Unit for which (a) and (b) are not true.
(a) The total current consumption for the I/O power supply exceeds the I/O power supply
capacity of the Additional I/O Power Supply Unit.
(b) Voltage drop in the I/O power supply causes the voltage of the I/O power supply to go
below the voltage specifications of the I/O circuits of the NX Units or the connected
external devices.
4
Repeat step 3 until the design conditions for the I/O power supply are met.
5-3-2 Designing the I/O Power Supply from the NX Bus
Procedure for Designing the I/O Power Supply
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