Omron PROFINET NX-PNC202, User Manual

Page: 76 / 282

5 Designing the Power Supply System
5 - 4
NX-series PROFINET Coupler Unit User’s Manual (W623)
Additional IO Power Sup-
ply Unit
This NX Unit provides additional IO power supply.
Use this NX Unit in the following cases.
(a) When the IO power supply capacity is insufficient
• When the total current consumption for the IO power supply exceeds the maxi-
mum IO power supply current of the PROFINET Coupler Unit
• When a voltage drop in the IO power supply causes the voltage of the IO power
supply to go below the voltage specifications of the IO circuits or connected
external devices
(b) Separating the IO power supply
• When connected external devices have different IO power supply voltages
• When separating the power supply systems
The NX Unit power supply of the Additional IO Power Supply Unit is connected to
the NX Unit on the left through the NX bus connector.
Unit name Function
PROFINET
Coupler Unit
- When different I/O power supply voltage are used.
- When separating the power supply systems.
When the I/O power supply
becomes the following states
for the subsequent NX Units.
- When it exceeds the maximum
I/O power supply current
- When it goes below the voltage
specifications of the connected
external devices
I/O power
supply
Unit power
supply
Case (b)
I/O power
supply
Case (a)
NX Unit
I/O power
supply
Unit power
supply
I/O power
supply
Additional I/O
Power Supply Unit
Separated by Additional I/O
Power Supply Unit
Internal
power
supply
circuit
NX Unit
Additional I/O
Power Supply Unit
Separated by Additional I/O
Power Supply Unit
PROFINET
Coupler Unit
Internal
power
supply
circuit