Omron NXR Series User Manual page 78

4 Designing the Power Supply System
(a) The sum of the total current consumption from the Unit/input power
supply and output power supply must not exceed the maximum power
supply current of the IO-Link Master Unit.
(b) The input circuit specifications of IO-Link Master Unit and the voltage
specifications of connected external devices are met even if the Unit/
input power supply voltage drops.
(c) The output circuit specifications of the IO-Link Master Unit and the
voltage specifications of connected external devices are met even if the
output power supply voltage drops.
*1. The maximum power supply current is 9 A. Do not exceed 9 A.
*2. For example, for the IO-Link Master Unit, confirm that the Unit/input power supply voltage is 20.4 to 26.4
VDC.
*3. For example, for the IO-Link Master Unit, confirm that the output power supply voltage is 20.4 to 26.4 VDC.
Calculating the Total Current Consumption in Direct Power Supply
When the power supply method is direct power supply, power is supplied to each IO-Link Master Unit.
Therefore, calculate the total current consumption of each Unit from each power supply. Design the
system so that the sum of the total current consumption from each power supply is less than the maxi-
mum power supply current of the IO-Link Master Unit.
The calculation methods for the total current consumption of the IO-Link Master Unit from the Unit/
input power supply and output power supply are given below.
 Total Current Consumption from Unit/Input Power Supply
= (Current consumption from Unit/input power supply)
+ (Current consumed between IO-Link Master Unit and IO-Link devices)
+ (Current consumed between IO-Link Master Unit and non-IO-Link input devices)
The items of the formula are described below.
Current consumption from
Unit/input power supply
Current consumed between
IO-Link Master Unit and IO-
Link devices
Current consumed between
IO-Link Master Unit and non-
IO-Link input devices
*1. Do not exceed the maximum load current of device power supply (2 A/pin) and the maximum port cur-
rent (4 A/port).
*2. This is the input current from IO-Link devices with digital outputs for pin 2.
*3. This corresponds to Input current of Digital inputs for pin 4 or digital inputs for pin 2 (in SIO (DI) Mode)
specified in 2-1-3 Unit Specifications on page 2-3.
4-8
Design condition
*1
*2
*3
Item
The current consumed by the IO-Link Master Unit. Use the Unit/input
power supply value of Current consumption in 2-1-3 Unit Specifications on
page 2-3.
Use the following formula to calculate this value.
(Current consumption from power supplies of IO-Link devices) + (Input cur-
*1 *2*3
rent
Use the following formula to calculate this value.
(Current consumption from power supplies of non-IO-Link input devices) +
*1
(Input current
Description
× Number of inputs used)
*3
× Number of inputs used)
NXR-series IO-Link Master Unit for EtherCAT User's Manual (W640)
Reference for confirmation meth-
od
Calculating the Total Current Con-
sumption in Direct Power Supply on
page 4-8
Calculating the Voltage Drop in Di-
rect Power Supply on page 4-12