Omron NXR Series User Manual page 84

4 Designing the Power Supply System
(b) The input circuit specifications of IO-Link Master Unit and the volt-
age 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 Power Supply with
Through-wiring
When the power supply method is power supply with through-wiring, unlike the case of direct power
supply, the current to be consumed by other IO-Link Master Units to which power is supplied flows
through the IO-Link Master Unit connected to external power supplies. Therefore, confirm that the sum
of the current consumption of the Units supplied from external power supplies does not exceed the
maximum power supply current of the IO-Link Master Unit. The following is an example.
In this example, confirm that the following condition is met.
(Iui1 + Iui2 + Iui3 + Io1 + Io2 + Io3) < (Maximum power supply current of ILM1
Iui1 + Iui2 + Iui3
Unit/input power supply
Output power supply
Iui1: Total current consumption of ILM1 from Unit/input power supply
Iui2: Total current consumption of ILM2 from Unit/input power supply
Iui3: Total current consumption of ILM3 from Unit/input power supply
Io1: Total current consumption of ILM1 from output power supply
Io2: Total current consumption of ILM2 from output power supply
Io3: Total current consumption of ILM3 from output power supply
*1. If the maximum power supply current of ILM1 is not exceeded, then that of ILM2 and ILM3 is not exceeded.
The calculation method for the total current consumption of each Unit from the Unit/input power supply
or output power supply is the same as that for direct power supply. Refer to Calculating the Total Cur-
rent Consumption in Direct Power Supply on page 4-8.
4-14
Design condition
*2
*3
ILM1 ILM2
Io1
Io2
Iui1 Iui2 Iui3
Iui2 + Iui3
Io2 + Io3
Io1 + Io2 + Io3
Reference for confirmation method
Calculating the Voltage Drop in Power
Supply with Through-wiring on page
4-17
ILM3
Io3
NXR-series IO-Link Master Unit for EtherCAT User's Manual (W640)
*1
)