Designing The Io Power Supply From The Nx Bus - Omron PROFINET NX-PNC202 User Manual

5 Designing the Power Supply System
5-3-2

Designing the IO Power Supply from the NX Bus

Procedure for Designing the IO Power Supply
Make sure that the following design conditions are met when you design the IO power supply from the
NX bus.
• The total current consumption from the IO power supply must not exceed the maximum IO power
supply current of the Unit that supplies the IO power.
• The voltage drop in the IO power supply must be within the voltage specifications of the IO circuits of
the NX Units and the connected external devices.
Use the following procedure to design the IO power supply.
1
Calculate the total current consumption from the IO power supply of the PROFINET Coupler
Unit and the NX Units that are connected to the PROFINET Coupler Unit, and calculate the volt-
age drop in the IO power supply.
2
If either of the following items (a) and (b) is true, add an Additional IO 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 IO power supply exceeds the IO power supply capac-
ity of the PROFINET Coupler Unit.
(b) 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 of the NX Units or the connected external
devices.
3
Calculate the voltage drop in the IO power supply after the Additional IO Power Supply Unit and
the total current consumption from the IO power supply that is required by the Additional IO
Power Supply Unit and by the NX Units that are connected after the Additional IO Power Supply
Unit.
If either of the following items (a) and (b) is true, add another Additional IO 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 IO power supply exceeds the IO power supply capac-
ity of the Additional IO Power Supply Unit.
(b) 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 of the NX Units or the connected external
devices.
4
Repeat step 3 until the design conditions for the IO power supply are met.
5 - 10
NX-series PROFINET Coupler Unit User's Manual (W623)