Omron PROFINET NX-PNC202, User Manual

Page: 89 / 282

5 - 17
5 Designing the Power Supply System
NX-series PROFINET Coupler Unit User’s Manual (W623)
5-4 Selecting External Pow
er Supplies and Protective Devices
5
5-4-1 Selecting the Unit Power Supply

Blocks
A block consists of the Unit that supplies the NX Unit power and the range of Units to which that Unit
supplies the NX Unit power. For example, in the configuration in the following figure there are two
blocks in the Profinet IO Device Terminal: the block with the PROFINET Coupler Unit and the block
with the Additional NX Unit Power Supply Unit.
The total of the required Unit power supply capacity for these two blocks is the required power sup-
ply capacity of the Unit power supply for the Profinet IO Device Terminal.
Precautions for Correct Use
Use the same Unit power supply to supply the Unit power to the entire IO Device Terminal. If
you supply power from different Unit power supplies, differences in electrical potential may
cause unexpected currents in the NX Unit power supply, which may result in failure or malfunc-
tion.

Calculation Example
This section provides a calculation example for the configuration example that is given in
5-2-2 Cal-
culation Example for the NX Unit Power Supply
on page 5-7.
• The NX Unit power supply efficiency of the PROFINET Coupler Unit is 70%.
In this configuration example, there is only one block, the PROFINET Coupler Unit block.
Required power supply capacity of Unit power supply to Profinet IO Device Terminal
= Required Unit power supply capacity of PROFINET Coupler Unit block
= (Power consumption from NX Unit power supply of PROFINET Coupler Unit + Total power con-
sumption from NX Unit power supply of NX Units connected to PROFINET Coupler Unit)/NX
Unit power supply efficiency of PROFINET Coupler Unit
= (1.6 W + (0.5 W × 5) + (0.8 W × 5))/0.7
= Approximately. 11.6 W
Name Model Quantity Power consumption/Unit
PROFINET Coupler Unit NX-PNC202 1 1.6 W
Digital Input Unit NX-ID3317 5 0.5 W
Relay Output Unit NX-OC2633 5 0.8 W
∙ ∙ ∙
Unit power
supply
Unit power
supply terminals
Additional NX Unit Power Supply Unit
Internal power supply circuits
Unit power
supply terminals
PROFINET Coupler Unit block
Additional NX Unit Power Supply Unit block
NX Units connected to the
PROFINET Coupler Unit
NX Units connected to the Additional
NX Unit Power Supply Unit
NX Unit power supply
PROFINET
Coupler Unit
NX Unit power supply
End Cover