Additional Information
Power Supply-related Units for the NX-series
The following three NX-series are related to power supply
.
• Additional NX Unit Power Supply Unit
• Additional I/O Power Supply Unit
• 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 OMRON websites, or contact your OMRON representatives.
3-2-2
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. Furthermore, for the CPU Rack, this must be less than the maximum I/O power supply
current specified for the CPU Unit. 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 of the I/O power supply from the NX
bus.
To confirm this and to calculate the I/O power supply capacity, calculate the total current consumption
of the I/O power supply from the NX bus.
The total I/O current consumption from the NX bus is the sum of the following: the current consump-
tion from the I/O power supply for the NX Units that receive power from the I/O power supply from the
NX bus, the current consumption of those I/O circuits, and the current consumption of connected ex-
ternal devices.
The current consumption of external connection loads and connected external devices is not included
in the current consumption from I/O power supply that is given for each model in the datasheets.
The total current consumption from I/O power supply of the Safety Control Unit is calculated as fol-
lows:
• Total Current Consumption from I/O Power Supply of Safety Input Unit
= (Current consumption from I/O power supply of Safety Input Unit) + (Input current of Safety Input
Unit × Number of inputs used) + (Total current consumption of connected external devices)
• Total Current Consumption from I/O Power Supply of Safety Output Unit
= (Current consumption from I/O power supply of Safety Output Unit) + (Total connected load cur-
rent) + (Total current consumption of connected external devices)
Refer to Section 2 Specifications on page 2 - 1 for the current consumption from I/O power supply of
each model of Safety I/O Unit and the input current for each model of Safety Input Unit.
3 Installation and Wiring
3 - 9
NX-series Safety Control Unit User's Manual (Z930)
3-2 Power Supply Types and Wiring
3
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