Mitsubishi FX3U SERIES User Manual page 95

FX Series Programmable Controllers
3U
User's Manual - Hardwaer Edition
4
Determine whether the devices can be connected to the main 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.
Capacity of 24V DC
power supply
Main unit
1-
3
mA
2. Calculate the current consumption of the built-in 5V DC power supply
Capacity of 5V DC
power supply
Main unit
1-
2
mA
If the calculation results for the current consumption for 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 configuration, adding input/output powered extension units or extension power
supply units.
If the calculation results for the current consumption for the 24V DC power supply and 5V DC power supply
are negative values, add an input/output powered extension unit.
→ Refer to Section 6.6 "Expansion of FX2N Series I/O Powered Extension Unit (Calculation of Current
If the calculation results for the current consumption by 5V DC is a negative value, add an extension power
supply unit (FX
3U
→ Refer to Section 6.8 "Number of Input/Output (Occupied) Points and Current Consumption"
Current consumption
Total of current consumed
by extension devices
2-
3
-
mA
Current consumption
Total of current consumed
by extension devices
2-
2
-
mA
-1PSU-5V).
6.5 Expansion of Main Unit (Calculation of Current Consumption)
Calculation result
≥
=
mA
Calculation result
≥
=
mA
6 Examination of System Configuration
0mA
.
0mA
Consumption)"
1
2
3
4
5
6
7
8
9
10
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