Omron PROFINET NX-PNC202, User Manual

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5 Designing the Power Supply System
5 - 16
NX-series PROFINET Coupler Unit User’s Manual (W623)
5-4 Selecting External Power Supplies
and Protective Devices
This section describes how to select the external power supplies and protective devices for the Profinet IO
Device Terminal, i.e., the Unit power supply and the IO power supplies.
This section describes how to select the Unit power supply for the Profinet IO Device Terminal.
Use an SELV power supply that meets the following conditions for the Unit power supply.
• Has overcurrent protection.
• Has double or reinforced insulation between the input and output.
• Has an output voltage of 24 VDC (20.4 to 28.8 VDC).
Recommended Power Supplies: S8JX Series (manufactured by OMRON)

Formula
This section describes how to calculate the required capacity of the Unit power supply for the Prof-
inet IO Device Terminal.
Use the following formula to calculate the required Unit power supply capacity for each block in the
Profinet IO Device Terminal.
Required Unit power supply capacity of each block = (A + B)/C
5-4-1 Selecting the Unit Power Supply
Recommended Power Supplies
Calculating the Required Power Supply Capacity of the Unit Power
Supply
Required capacity of the Unit power supply
for the Profinet IO Device Terminal
= Total of required Unit power supply capacity
for each block
A NX Unit power consumption of the Unit that supplies the NX Unit power
B Total power consumption from the NX Unit power supply that is required by the NX Units that
are connected to the Unit that supplies NX Unit power
C NX Unit power supply efficiency of the Unit that supplies the NX Unit power