Omron NXR Series User Manual page 59

Voltage specifications of the Digital
I/O Variable Hub
Voltage specifications of connected
external devices
 Calculation Method
Calculate the input voltages of the Unit/input power supply and output power supply for the Digital
I/O Variable Hub, input devices, and output devices. The sum of the total current consumptions
from Unit/input power supply and output power supply is 2.22 A and the length of the IO-Link cable
is 1 m. Therefore, based on the value for 3 A in the table of voltage drops for the IO-Link cable, the
applicable voltage drop is 0.60 V. Accordingly, input voltages to the Digital I/O Variable Hub, input
devices, and output devices are as follows:
a. Input voltage to the Digital I/O Variable Hub
= (Voltage of the external power supply connected to the IO-Link Master Unit) - (Voltage drop in
the power supply cable and the IO-Link Master Unit) - (Voltage drop in the IO-Link cable)
= 26.4 V - 0.51 V - 0.60 V
= 25.29 V
b. Input voltage to input devices
= (Voltage of the external power supply connected to the IO-Link Master Unit) - (Voltage drop in
the power supply cable and the IO-Link Master Unit) - (Voltage drop in the IO-Link cable)
= 26.4 V - 0.51 V - 0.60 V
= 25.29 V
c. Input voltage to output devices
= (Voltage of the external power supply connected to the IO-Link Master Unit) - (Voltage drop in
the power supply cable and the IO-Link Master Unit) -(Residual voltage at the digital outputs for
pin 2 of the IO-Link Master Unit) - (Voltage drop in the IO-Link cable) - (Residual voltage at the
digital output of the Digital I/O Variable Hub)
= 26.4 V - 0.51 V - 1.5 V - 0.60 V - 1.2 V
= 22.59 V
The calculation results are acceptable because they meet the voltage specifications of the Digi-
tal I/O Variable Hub, input devices, and output devices. If the calculation results do not meet the
voltage specifications, review the length of the IO-Link cable and the connected external devi-
ces.
NXR-series IO-Link I/O Hub User's Manual (W620)
Item
•
Unit/input power supply: 20.4 to 26.4 VDC
•
Output power supply: 20.4 to 26.4 VDC
•
Input device: 20.4 to 26.4 VDC
•
Output device: 20.4 to 26.4 VDC
4 Designing the Power Supply System
Conditions
4
4-9