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4 Installation and Wiring
NX-series Digital I/O Unit User’s Manual (W521)
4-2 Wiring the Power Supply to the Slave Terminal
4
4-2-3 Calculating the Total Current Consumption from I/O Power 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 A-1 Data Sheet 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
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