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4 SYSTEM CONFIGURATION
4.4 Limitation on Current Consumption
49
4
4. Check if expansion to the CPU module is permitted.
• 5 V DC power supply
• 24 V DC power supply
The value obtained by this calculation (when the value is positive) indicates the remaining capacity of 24 V DC service power
supply, and the capacity can be used for external loads.
If the calculation result is a negative value, the current consumption exceeds the power supply capacity of the CPU module.
Reconfigure the system, adding powered input/output module or extension power supply modules.
Power supply check from the powered input/output module
(current consumption calculation)
If 24 V DC and 5 V DC power supplies of the CPU module are insufficient and system cannot be extended, add a powered
input/output module.
Check if power can be supplied to extension modules with the power supply capacity of the powered input/output module.
Calculate following the procedure below.
1. Check the power supply capacity of the powered input/output module.
(Page 33 Powered input/output module)
*1 Value when service power supply is used for input circuits.The power supply capacity differs when external power supply is used for
input circuit.
Type Model Power supply capacity
5 V DC power supply 24 V DC service power supply
Powered input/output module FX5-32ER/ES 965 mA 250 mA
*1
mA
-
mA
CPU module
Current consumption
mA
≥
0 mA
=
Calculation result
Ex.
510 mA900 mA 390 mA
Capacity of 5 V DC
power supply
Total of current
consumed by extension
module
mA
-
mA
CPU module
Current consumption
mA
≥
0 mA
=
Calculation result
Ex.
240 mA400 mA 160 mA
Capacity of 24 V DC
power supply
Total of current
consumed by extension
module
CPU module
Expansion
adapters
Expansion
board
Output
module
Input
module
Output
module
Input
module
FX5
Intelligent
module
FX3
Intelligent
module
Powered
input/
output
module
Power supply from powered input/output module
Bus
conversion
module
Ex.