Omron PROFINET NX-PNC202 User Manual page 92

5 Designing the Power Supply System
Installation Locations for Protective Devices
Install protective devices for the Unit power supply and IO power supply in the locations that are shown
in the following figure.
PROFINET
Coupler Unit
Unit power
supply terminals
I_unit1
Protective
device
I_io1
Protective
device
I/O power
supply
Unit power
supply
However, fewer protective devices may be required when the current consumption of each block does
not exceed the rated current. An example of this is provided below.
5 - 20
Block that is supplied I/O power from the PROFINET
Coupler Unit
Block that is supplied Unit
Block that is supplied Unit power from the Additional
power from the PROFINET- NX Unit Power Supply
Coupler Unit Unit
NX Unit
NX Unit NX Unit
Additional NX Unit Additional NX Unit
power power
Power Supply Unit Power Supply Unit
supply supply
Internal
power
supply
circuit
I/O power I/O power Unit power Unit power
supply terminals supply terminals supply terminals supply terminals
I_unit2
Protective
device
Block that is supplied I/O
power from the Additional
I/O Power Supply Unit
Additional I/O Additional I/O
Power Supply Unit Power Supply Unit
Internal
power
supply
circuit
I/O power I/O power
supply terminals supply terminals
I_io2
Protective
device
NX-series PROFINET Coupler Unit User's Manual (W623)
NX Unit NX Unit
power supply power supply