Mitsubishi FX3U SERIES User Manual page 104

FX Series Programmable Controllers
3U
User's Manual - Hardware Edition
3
Determine whether FX
Determine the number of analog special function blocks (FX
connected to the input/output powered extension unit by the following method.
• When connecting to FX
FX -3A
0N
90mA
×
• When connecting to FX
FX -3A
0N
90mA
×
units
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.
Capacity of 24V DC
power supply
Input/output powered
extension unit
3-
3
2. Calculate the current consumption of the built-in 5V DC power supply.
Capacity of 5V DC
power supply
Input/output powered
extension unit
3-
2
mA
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.
98
6.6 Expansion of FX2N Series I/O Powered Extension Unit (Calculation of Current Consumption)
-3A, FX
0N
-32E
2N
Analog special function block
FX -2AD
2N
50mA
×
+
units units
-48E
2N
Analog special function block
FX -2AD
2N
50mA
×
+
units
Current consumption
Total of current consumed by
extension devices
4-
3
-
mA mA
Current consumption
Total of current consumed by
extension devices
4-
2
-
mA
-2AD and FX -2DA can be added.
2N 2N
-3A, FX
0N
FX -2DA
2N
85mA
×
+
units
FX -2DA
2N
85mA
×
+
units
Calculation result
=
mA
Calculation result
≥
=
mA
6 Examination of System Configuration
-2AD and FX
2N
Total current
consumption
=
mA
Total current
consumption
=
mA
≥
0mA
0mA
-2DA) to be
2N
190mA
≤
300mA
≤