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4 Designing the Power Supply System
4-2
Designing the Power Supply System
This section describes how to design the power supply system for the IO-Link I/O Hubs.
Make sure that the voltages and currents that are input to the Hubs are
within the specified ranges.
Inputting voltages or currents that are outside of the specified ranges
may cause accidents or fire.
4-2-1
Procedure for Designing the Power Supply System
The overall procedure for designing the power supply system for the IO-Link I/O Hubs is as follows.
Step
1. Designing the
Power Supply Sys-
tem
2. Selecting an Ex-
ternal Power Sup-
plies and Protec-
tive Devices
4-2-2
Design Conditions for the Power Supply System
The design conditions for the power supply system for an IO-Link I/O Hub are given below.
(a) The total current consumption from the Unit/input power supply must
not exceed the maximum current of the IO-Link I/O Hub.
(b) The total current consumption from the output power supply must not
exceed the maximum current of the IO-Link I/O Hub.
(c) The input circuit specifications of IO-Link I/O Hub and the voltage spec-
ifications of connected external devices are met even if the Unit/input pow-
er supply voltage drops.
(d) The output circuit specifications of the IO-Link I/O Hub and the voltage
specifications of connected external devices are met even if the output
power supply voltage drops.
*1.
For the Digital I/O Hubs, make sure that the total current consumption does not exceed 0.84 A, the maxi-
mum current of Unit/input power supply.
*2.
For example, for the Digital I/O Variable Hub, make sure that the total current consumption does not exceed
2.0 A, the maximum current of output power supply.
*3.
For example, for the Digital I/O Hubs, confirm that the Unit/input power supply voltage is 20.4 to 26.4 VDC.
4-4
WARNING
Description
Perform the following design operations and confirm that
they meet the design conditions.
•
Designing the Unit/input power supply
•
Designing the output power supply
Calculate the power supply capacity from the current con-
sumption calculated in step 1, and select external power
supplies accordingly. In addition, select protective devices
(e.g., breakers and fuses) to protect against short circuits
and overcurrents in external circuits.
Design condition
*3
*4
Reference for confirmation
4-2-3 Calculating the Total Current
Consumption on page 4-5
*1
*2
4-2-4 Calculating the Voltage Drop
on page 4-7
NXR-series IO-Link I/O Hub User's Manual (W620)
Reference
4-2-2 Design Conditions for
the Power Supply System
on page 4-4
4-3 Selecting the External
Power Supply and Protec-
tive Devices on page 4-10
method
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