4 - 11
4 Installation and Wiring
NX-series Digital I/O Unit User’s Manual (W521)
4-2 Wiring
th
e Power Sup
p
ly t
o
th
e Slave T
ermin
al
4
4-
2-3 C
alculating
the T
o
ta
l C
urr
ent
Consumption from
I/O Pow
er Supply
The total current consumption of I/O power supplied from the NX bus must be within the range of the
maximum I/O power supply current of the Communications Coupler Unit or the Additional I/O Power
Supply Unit.
To confirm this and to calculate the I/O power supply capacity, calculate the total current consumption
from I/O power supply from the NX bus.
The total current consumption from I/O power supply from the NX bus is the total sum of current con-
sumption from I/O power supply of the NX Unit that supplies the I/O power from the NX bus, the current
consumption of each applicable I/O circuit, and current consumption of any connected external
devices.
Note that the current consumption from I/O power supply indicated in the data sheet for each Unit type
does not include the load current of any external connection load and current consumption of any con-
nected external devices.
The total current consumption from I/O power supply of the Digital I/O Units is calculated as follows.
Total Current Consumption from I/O Power Supply of the Digital Input Units
= (Current consumption from I/O power supply of the Digital Input Units) + (Input current of the Digi-
tal Input Units × Number of input points used) + (Total current consumption of connected external
devices)
Total Current Consumption from I/O Power Supply of the Digital Output Units
= (Current consumption from I/O power supply of the Digital Output Units) + (Total load current of
connection load) + (Total current consumption of connected external devices)
Refer to
on page A-2 for the current consumption from I/O power supply for each Digital
I/O Unit model and input current for each Digital Input Unit model.
There are no above confirmations if you use the NX Unit that supplies the I/O power from external
source.
Use the total current consumption from I/O power supply from external source and the total current con-
sumption from the I/O power supply from the above NX bus together to calculate the I/O power supply
capacity.
4-2-3
Calculating the Total Current Consumption from I/O Power Sup-
ply
Summary of Contents for NX-IA3117
Page 34: ...Sections in this Manual 32 NX series Digital I O Unit User s Manual W521...
Page 52: ...1 Features and System Configuration 1 18 NX series Digital I O Unit User s Manual W521...
Page 56: ...2 Specifications 2 4 NX series Digital I O Unit User s Manual W521...
Page 152: ...5 I O Refreshing 5 36 NX series Digital I O Unit User s Manual W521...
Page 204: ...8 Digital Mixed I O Units 8 8 NX series Digital I O Unit User s Manual W521...
Page 224: ...9 Troubleshooting 9 20 NX series Digital I O Unit User s Manual W521...
Page 230: ...10 Inspection and Maintenance 10 6 NX series Digital I O Unit User s Manual W521...
Page 337: ...I 1 I NX series Digital I O Unit User s Manual W521 Index...
Page 340: ...I 4 NX series Digital I O Unit User s Manual W521 Index...
