FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
118
6 Examination of System Configuration
6.7 Expansion of Extension Power Supply Unit (FX3U-1PSU-5V)
3 Determine whether the devices can be added to the extension power supply
unit.
Calculate the current to confirm whether the selected extension devices can be connected.
1. Calculate the current consumption of the built-in 5V DC power supply.
2. Calculate the available current supply from the internal 24V DC power supply.
3. Calculate the available input/output occupied points (excluding the occupied input/output
by special function units/blocks).
If the calculation result for the 5V DC power supply is a negative value, the current consumption exceeds the
power supply capacity.
Reconfigure the system with an extension power supply unit.
If the calculation results for the internal 24V DC power supply and input/output occupied points are negative
values, the actual input/output occupied points exceed the connectable input/output occupied points.
Reconfigure the system with an input/output powered extension unit.
mA
-
mA
Extension power
supply unit
Total of current consumed
by extension devices
Current consumption
Capacity of 5V DC
power supply
mA
≥
0mA=
Calculation result
5-
1
6-
1
mA
-
mA mA
≥
0mA=
Current consumption
Power supply
capacity for
internal 24V DC
Calculation result
Extension power
supply unit
Total of current consumed
by extension devices
5-
2
6-
2
points
-
points points
≥
0points=
Number of I/O
occupied points
Connectable I/O
occupied points
Calculation result
Extension power
supply unit
Total of I/O occupied points
by extension devices
5-
3
6-
3
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