Calculating The Total Current Consumption From I/O Power Supply - Omron NX-ILM400 User Manual

4 Installation and Wiring
 Supply from External Source
Power is supplied to the Units from an external source.
I/O power is supplied by connecting an I/O power supply to the I/O power supply terminals on the
Units.
Additional Information
NX-series Power Supply-related Units
The following three NX-series Units are related to power supply.
• Additional NX Unit Power Supply Units
• Additional I/O Power Supply Units
• I/O Power Supply Connection Units
Refer to the NX-series System Unit User's Manual (Cat. No. W523) for the specifications of
these Units.
For a complete list of the latest power supply Units in the NX Series, refer to the product catalog
or official website, or contact your OMRON representative.
4-2-2 Calculating the Total Current Consumption from I/O Power Sup-
ply
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. For CPU Racks, the maximum I/O power supply current is restricted regardless of the
Additional I/O Power Supply Unit model. Refer to the hardware user's manual for the CPU Unit to which
the NX Units are connected for details on restrictions for CPU Racks.
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 current consumption from I/O power supply of the IO-Link Master Unit is calculated as described
below.
 Total Current Consumption of the IO-Link Master Unit from the I/O Power
Supply
= (Current consumption from I/O power supply of the IO-Link Master Unit) + (Input current × Number
of input points used) + (Load current × Number of output points used) + (Total current consumption
of connected external devices)
Refer to A-1 Data Sheet on page A-2 for the current consumption from the I/O power supply and input
current for each model of the IO-Link Master Units.
4 - 10
NX-series IO-Link Master Unit User's Manual (W567)