Omron NX1P2 series User Manual page 120

4 Designing the Power Supply System
NX-series NX1P2 CPU Unit
I/O power supply terminals
 Maximum I/O Power Supply Current
The maximum I/O power supply current is the maximum current that the I/O power supply that is
connected to the Additional I/O Power Supply Unit can supply through the NX bus connectors to the
NX Units.
When an Additional I/O Power Supply Unit is used on the CPU Rack, the maximum value is 4 A
regardless of the Unit specifications.
For example, when an NX-PF0730 Additional I/O Power Supply Unit is used, its maximum I/O
power supply current is 10 A. However, you must operate the NX-PF0730 at 4 A or less when you
use it on the CPU Rack.
Precautions for Safe Use
Use the I/O power supply current for the CPU Rack of NX1P2 CPU Unit at 4 A or less. Using
the currents that are outside of the specifications may cause failure or damage.
4 - 12
a. Total current consumption from I/O power
supply is 4 A or less
(NX Units with the supply from external
source or no supply are excluded from
calculation)
b. The voltage drop in the I/O power supply is
within the voltage specifications of the I/O
circuits of the NX Units and the connected
external devices.
Additional NX Unit NX Unit
I/O Power (supply (supply
Supply from from
Unit 1 the NX the NX
bus) bus)
I/O
power
supply
To external
I/O power
devices
supply
(DC)
• When NX Units that require supply
from the NX bus are on the CPU Rack
8 max.
a. Total current consumption from I/O power
supply is 4 A or less
(NX Units with the supply from external
source or no supply are excluded from
calculation)
b. The voltage drop in the I/O power supply is
within the voltage specifications of the I/O
circuits of the NX Units and the connected
external devices.
NX Unit Additional NX Unit
(supply I/O Power (supply
from Supply from
external Unit 2 the NX
source) bus)
I/O
power
supply
To external
I/O power
External
devices
supply
device
(DC)
• When it exceeds the maximum I/O power supply
current, 4 A
• When the I/O power supply voltage drops severely
• When separating the I/O power supply
NX-series NX1P2 CPU Unit Hardware User's Manual (W578)
NX Unit NX Unit
(supply (no
from supply)
the NX
bus)
End Cover
External
device