Mitsubishi FX3U SERIES User Manual page 121

FX Series Programmable Controllers
3U
User's Manual - Hardwaer Edition
3. Calculate the total number of input/output occupied points (number of input/output points).
Total number of input/output points
Number of input/output
occupied points
A
176 points
Total obtained in Step 1
6
Determine whether the devices can be added to the main unit.
Calculate the current by the following formula to confirm whether the extension devices selected in
Step 2 can be connected.
1. Calculate the current consumption of the built-in 5V DC power supply.
Capacity of 5V DC
power supply
Main unit
1-
2
500mA
2. 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
Input/output on network
B
+
32 points
Total obtained in Step 2
Current consumption
Total of current consumed by
extension devices
2-
2
- =
370mA
Current consumption
Total of current consumed by
extension devices
2-
3
- =
400mA
6 Examination of System Configuration
6.9 Example of System Configuration and System Modification
Calculation
result input/output points
≤
= 208 points 384 points
Calculation result
≥
130mA
Calculation result
≥
0mA
200mA
Max. number of
OK
OK
0mA
OK
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