Calculation Example For The Nx Unit Power Supply - Omron NX1P2 series User Manual

4 Designing the Power Supply System
 NX Unit Power Supply Capacity and Restrictions
The internal power supply circuits of the CPU Unit or Additional NX Unit Power Supply Unit supply
the NX Unit power to the NX Units.
The NX Unit power supply capacity does not include the NX Unit power consumption of the Addi-
tional NX Unit Power Supply Units.
The power supply capacity of the CPU Unit is 10 W.
For restrictions on the Additional NX Unit Power Supply Unit, refer to the NX-series System Units
User's Manual (Cat. No. W523).
Precautions for Correct Use
• Do not exceed the NX Unit power supply capacity. If you exceed the NX Unit power supply
capacity, malfunction may occur.
• Use the same Unit power supply to supply the Unit power to the entire CPU Rack. If you sup-
ply 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 malfunction.
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Calculation Example for the NX Unit Power Supply

This section provides a calculation example for the NX Unit power supply.
 Unit Configuration Example
CPU Unit
Additional I/O Power Supply Unit
Digital Input Unit
Relay Output Unit
*1. For the power consumption of the NX Units connected to the CPU Unit, refer to the user's manuals for
individual NX Units.
 Calculating the Total Power Consumption from the NX Unit Power Supply
Calculate the total power consumption from the NX Unit power supply that is required by the NX
Units that are connected to the CPU Unit.
Total power consumption from NX Unit power supply [W] = 0.85 W × 1 + 0.90 W × 4 + 1.20 W × 3 =
8.05 W
 Confirming the NX Unit Power Supply Capacity of the CPU Unit
The NX Unit power supply capacity is 10 W max.
Therefore, in this example, the total power consumption from the NX Unit power supply is 8.05 W,
and the NX Unit power supply capacity is 10 W max., so the design conditions are met.
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Name
NX1P2-1140DT
NX-PF0630
NX-ID3317
NX-OC2633
Model Quantity
1
1
4
3
NX-series NX1P2 CPU Unit Hardware User's Manual (W578)
*1
Power consumption/Unit
7.05 W
0.85 W
0.90 W
1.20 W