Omron sysmac NX Series User Manual page 154

4 Designing the Power Supply System
NX-series
Communication Control
Unit
I/O power supply
terminals
l Maximum I/O Power Supply Current
The maximum I/O current refers to the maximum current that can be supplied to the NX Units from
I/O power supply terminals of the Communication Control Unit or the I/O power supply connected
to the Additional I/O Power Supply Unit via an NX bus connector.
For information on the maximum I/O power current supplied from the Additional I/O Power Supply
Unit, refer to the NX-series System Units User's Manual (Cat. No. W523).
Precautions for Safe Use
Use the I/O power current supplied to the CPU Rack from I/O power supply terminals of the NX-
CSG320 Communication Control Unit at 4 or less. Using the currents that are outside of the
specifications may cause failure or damage.
4-14
a. The total current consumption from I/O power
supply is less than the maximum I/O power
supply current (NX Units for "Supplied from
external source" and "Not supplied" are
excluded)
b. A voltage drop in the I/O power supply is within
a range of voltage specifications of the I/O
circuits and connected external devices for NX
Units
NX Unit NX Unit
(supplied (supplied
from the from the
NX bus) NX bus)
I/O power supply
To connected
I/O power supply
external device
(24 VDC, etc.)
When NX Units that require a power
supply from the NX bus are on the
CPU Rack
NX-series Safety Control Unit/Communication Control Unit User's Manual (Z395)
32 units max.
a. The total current consumption from I/O power
supply is less than the maximum I/O power
supply current (NX Units for "Supplied from
external source" and "Not supplied" are
excluded)
b. A voltage drop in the I/O power supply is within
a range of voltage specifications of the I/O
circuits and connected external devices for NX
Units
NX Unit NX Unit Addi-
tional I/O
(supplied (supplied
Power
from the from
Supply
NX bus) external
Unit
source)
I/O power
Connected
external
supply
device
(DC)
When it exceeds the maximum I/O power
supply current (4A)
When the voltage drop of I/O power supply
voltage is great
When the I/O power supply needs to be
separated
NX Unit NX Unit NX Unit
(not
(supplied (supplied
supplied)
from the from the
NX bus) NX bus)
I/O power
supply
End
Cover
To connected
Connected
external
external
device
device