Omron NX1P2 Series Hardware User Manual page 120

4 Designing the Power Supply System
Unit name
Additional I/O
Power Supply
Unit
I/O Power Sup-
ply Connection
Unit
For the specifications of NX-series power supply-related Units, refer to the NX-series System Units
User's Manual (Cat. No. W523). For information on the latest lineup of the NX-series power supply-
related Units, refer to the relevant catalogs or OMRON websites, or ask your OMRON representative.
Additional NX Unit Power Supply Unit
You can use Additional NX Unit Power Supply Units to deliver additional supply of NX Unit power
when the total power consumption of the internal circuits of NX Units on the CPU Rack exceeds the
NX Unit power supply capacity of the CPU Unit.
The following figure shows how to use an Additional NX Unit Power Supply Unit. Assume that three
NX Units, No.1 to No.3, are connected to the CPU Rack, as shown below. Also assume that only NX
Unit No.1 is supplied with adequate NX Unit power because the total power consumption of the inter-
nal circuits of the three NX Units exceeds the NX Unit power supply capacity of the CPU Unit. In this
case, insert an Additional NX Unit Power Supply Unit between NX Units No.1 and No.2. Connect its
Unit power supply terminals to the Unit power supply. The NX Unit power is supplied to NX Units No.2
and No.3 via the inserted Additional NX Unit Power Supply Unit, instead of the CPU Unit.
More than one Additional NX Unit Power Supply Unit can be connected to the CPU Rack. If adequate
NX Unit power is not provided for all the NX Units on the right side of the Additional NX Unit Power
Supply Unit, add another Additional NX Unit Power Supply Unit to an appropriate place.
Basically, the NX Unit power supply line connects adjacent NX Units through the NX bus. However,
the NX Unit power supply line is separated by an inserted Additional NX Unit Power Supply Unit. In
the figure below, the NX Unit power supply line is separated between NX Unit No.1 and the Additional
NX Unit Power Supply Unit. However, the I/O power supply line is not separated by the Additional NX
Unit Power Supply Unit. Therefore, the I/O power supply line is connected through all the NX Units,
No.1 to No.3.
4-4
•
Connect an external I/O power supply to this Unit to deliver the I/O power to NX Units on
the CPU Rack through the NX bus, if necessary.
•
Supply additional I/O power via this Unit if over 4 A is consumed in total by the I/O circuits
of the NX Units on the CPU Rack and external devices connected to the NX Units.
•
Supply additional I/O power via this Unit if the I/O power voltage goes below the voltage
levels specified for the I/O circuits of the NX Units on the CPU Rack or those specified for
the connected external devices.
•
Insert this Unit to separate the I/O power supply line if any NX Unit on the CPU Rack is
connected to an external device with a different I/O power supply voltage.
•
Insert this Unit to separate the I/O power supply line to prevent noise and other factors
from affecting the other NX Units.
Add this Unit to provide additional I/O power supply terminals if required to connect external
devices to a Digital I/O Unit or Analog I/O Unit.
Description
NX-series NX1P2 CPU Unit Hardware User's Manual (W578)