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4 Designing the Power Supply System
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
4-1 Power Supply System and Design Concepts
4
4-1-1 Power Supply System and Types of Power Supplies
There are the following two types of power supplies that supply power to the CPU Rack of an NX1P2
CPU Unit.
Precautions for Correct Use
Always use separate power supplies for the Unit power supply and the I/O power supply. If you
supply power from the same power supply, noise may cause malfunctions.
Power Supply Types
Power supply type Description
Unit power supply This is the power supply for generating the internal power supply required for
the CPU Rack to operate.
This power supply is connected to the Unit power supply terminals on the CPU
Unit.
From the Unit power supply, the internal power supply circuit in the CPU Unit
generates the internal circuit power supply, Option Board power supply and NX
Unit power supply.
The internal circuits of the NX Units operate on the NX Unit power supply.
The NX Unit power supply can supply up to 10 W power to the NX Units
through the NX bus connectors.
I/O power
supply
For NX Units This power supply is used for driving the I/O circuits of the NX Units and for the
connected external devices.
When the type of the I/O power supply to NX Units
*1
is the supply from NX bus,
this power supply is connected to the I/O power supply terminals on the Addi-
tional I/O Power Supply Unit. The I/O power supply is supplied to the NX Units
from the I/O power supply terminals and through the NX bus connectors.
The CPU Unit does not have the I/O power supply terminals used for the NX
Units.
On the CPU Rack, the maximum I/O power supply current that can be supplied
to the NX Units from the Additional I/O Power Supply Unit and through the NX
bus connectors is 4 A.
When the type of the I/O power supply to all NX Units on the CPU Rack is the
supply from external source, the Additional I/O Power Supply Unit is not
needed.
The I/O power supply for the NX Units are independent from the I/O power sup-
ply for the CPU Unit's built-in I/O.
*1. Refer to the datasheet included in the user’s manual of the specific NX Unit for the supply method of each NX
Unit model.
For built-in I/O This power supply is used for driving the PNP (sourcing) type built-in I/O output
circuit.
This I/O power supply is independent from the I/O power supply for the NX
Units.
Refer to Current consumption from I/O power supply in the table under Output
Specifications on page 3-15 in 3-1-4 Terminal Blocks on page 3-10 for details
on the current specifications.
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