Mitsubishi FX3U SERIES User Manual page 117

FX Series Programmable Controllers
3U
User's Manual - Hardwaer Edition
4
Determine whether the devices can be added to the main unit.
Calculate the current consumption to confirm whether the extension devices selected in the above
step can be connected.
4. Calculate the current consumption of the built-in 5V DC power supply.
Capacity of 5V DC
power supply
Main unit
1-
2
500mA
5. 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 the 24V
DC service power supply, that can be used for external loads.
Capacity of 24V DC
power supply
Main unit
1-
3
600mA
Since the calculated values of the current consumption of the 5V DC and 24V DC power supplies
are negative, it is necessary to reexamine the configuration.
The next subsection explains the procedures for evaluating a reexamined and modified configura-
tion.
Current consumption
Total of current consumed
by extension devices
2-
2
- =
760mA
Current consumption
Total of current consumed
by extension devices
2-
3
- =
650mA
6 Examination of System Configuration
6.9 Example of System Configuration and System Modification
Calculation result
NG
-260mA
Calculation result
NG
-50mA
1
2
3
4
5
6
7
8
9
10
111