2-5
Section 2 System Conguration
<Calculation example of current consumption>
Whether or not to use an expansion power supply is determined by the total current consumption of all the units. You need to
calculate the total current consumption and mount an expansion power supply unit if the current is insufcient.
Referring the tables on the previous page, calculate the current consumption.
Subtract the total current consumption of the main unit, additionally connected front board, expansion left side unit, and
expansion right side units from the current supplied from the main unit. When the result is minus, you need to mount an
expansion power supply. Thus mount an expansion power supply unit if the current is insufcient for the expansion units that are
connected on the right.
Expansion power supply units are excluded from the number of connectable expansion units.
● Main calculation formula
[Supplied current] - [Current consumption]
= [Current supplied from main unit] - [Current consumption of main unit]
- [Current consumption of front board]
- [Current consumption of expansion left side unit]
- [Total current consumption of expansion right side units]
>= 0
● Calculation formula for current consumption on the right of the expansion unit with power supply
(Expansion unit with power supply is referred to as “Exp_powunit” here.)
Exp_powunit receives the remaining current of the main unit on the left side and adds it to the current that Exp_powunit
supplies to supply expansion units connected on the right.
I_MainR + I_Exp_powunit - I_Exp >= 0
• I_MainR (Remaining current of main unit)
= [Current supplied from main unit] - [Current consumption of expansion left side unit]
- [Current consumption of expansion right side units]
- [Current consumption of front board]
• I_Exp_powunit (Current supplied from Exp_powunit)
• I_Exp (Total current consumption of expansion units that are connected on the right of Exp_powunit)
● Calculation formula when using an expansion power supply unit
Use the above calculation formula by replacing Exp_powunit with the expansion power supply unit.
<Calculation of current consumption by using the loader function>
When registering units in the system denition by using the loader, you can check the total current consumption of the units and
the supplied current value.
(Since externally supplied 24V DC is not calculated by the loader, you need to calculate it.)
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