FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
98
6 Examination of System Configuration
6.6 Expansion of FX2N Series I/O Powered Extension Unit (Calculation of Current Consumption)
3 Determine whether FX0N-3A, FX2N-2AD and FX2N-2DA can be added.
Determine the number of analog special function blocks (FX0N-3A, FX2N-2AD and FX2N-2DA) to be
connected to the input/output powered extension unit by the following method.
• When connecting to FX2N-32E
• When connecting to FX
2N-48Eîš…
4 Determine whether the devices can be added to the input/output powered
extension unit.
Calculate the current to confirm whether the selected extension devices can be connected.
1. Calculate the current consumption of the built-in 24V DC power supply (24V DC service
power supply).
The value obtained by this calculation (when the value is positive) indicates the remaining capacity of 24V DC
service power supply, and the capacity can be used for external loads.
2. Calculate the current consumption of the built-in 5V DC power supply.
If the calculation results for the current consumption of the 24V DC power supply and 5V DC power supply
are negative values, the current consumption exceeds the capacity of the built-in power supply.
Reconfigure the system, adding input/output powered extension units or extension power supply units.
FX
2N
-2DA
units
85mA
Analog special function block
FX
0N
-3A
units
90mA
FX
2N
-2AD
units
50mA
Total current
consumption
mA
=
≤
190mA
++
×× ×
FX
2N
-2DA
units
85mA
Analog special function block
FX
0N
-3A
units
90mA
FX
2N
-2AD
units
50mA
Total current
consumption
mA
=
≤
300mA
++
×× ×
mA
-
mA
Input/output powered
extension unit
Total of current consumed by
extension devices
Current consumption
Capacity of 24V DC
power supply
mA
≥
0mA=
Calculation result
3-
3
4-
3
mA
-
mA mA
≥
0mA=
Current consumption
Capacity of 5V DC
power supply
Calculation result
Input/output powered
extension unit
Total of current consumed by
extension devices
3-
2
4-
2
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