Omron NXR Series User Manual page 58

4 Designing the Power Supply System
Design the system so that the voltage specifications of the IO-Link I/O Hub and connected external
devices are met even if the voltage of the Unit/input power supply and output power supply drops.
The following shows an example of calculation. Follow the procedure described in this example to
calculate voltage drop.
Calculation Example for Voltage Drop
The following example explains how to calculate voltage drop under the following conditions.
 Configuration Example
I/O connectors
(P1 to P8)
Power supply
connector (input)
(PWR IN)
Power supply
cable
Unit/input
power supply
(26.4 VDC)
Output power
supply
(26.4 VDC)
 Conditions
Application conditions for connected
external devices
Voltage of the external power supply
connected to the IO-Link Master Unit
Voltage drop in the power supply ca-
ble and the IO-Link Master Unit
Residual voltage at the digital out-
puts for pin 2 of the IO-Link Master
Unit
IO-Link cable length
4-8
IO-Link Master Unit
Internal IO-Link
connector
circuits
IO-Link
cable
Power supply
connector (output)
(PWR OUT)
Item
Use the conditions specified in Calculation Example for the Total
Current Consumption on page 4-5 in 4-2-3 Calculating the Total Cur-
rent Consumption on page 4-5.
The conditions lead to the total current consumption from Unit/input
power supply and the total current consumption from output power
supply below:
•
Total current consumption from Unit/input power supply: 0.38 A
•
Total current consumption from output power supply: 1.84 A
This gives 2.22 A as the sum of total current consumptions from
Unit/input power supply and output power supply.
•
Unit/input power supply: 26.4 VDC
•
Output power supply: 26.4 VDC
Calculate while assuming that the sum of voltage drops in the power
supply cable and the IO-Link Master Unit is 0.51 V.
1.5 V
1 m
Digital I/O Variable Hub
Internal
circuits
I/O connectors
(P1 to P8)
Conditions
NXR-series IO-Link I/O Hub User's Manual (W620)