IDEC MICROSmart FC6A Series User Manual page 274

3: I
NSTALLATION AND
Calculating the Power Consumed by the Main Power Supply
Calculate the power by referring to the values of the modules given in the table in "Internal Power Supply Current of the Modules
and Cartridges" on page 3-39.
■ Examples of Calculating the Power Consumed by Expansion Modules
When the FC6A-R081 is connected to the All-in-One CPU module/CAN J1939 All-in-One CPU module
Calculate the voltage conversion in the CPU module with the following efficiencies.
70%
AC Universal
Voltage [VA]
70%
24V DC
70%
12V DC
For the FC6A-R081
5 V
( I × V ) + ( I
out out
P =
R081
0.7
0 A × 3.3 V
( )
+ (0.035 A × 5 V) + (0.006 A × 8 points × 24 V)
0.9 × 5 V
=
≈ 1.9 [W]
3-42
W
IRING
P [VA]
in
24 V (Service Power Supply)
24 V (Internal)
5 V (Internal)
3.3 V (Internal)
90%
P [W]
in
24 V (Internal)
5 V (Internal)
3.3 V (Internal)
90%
P [W]
in
24 V (Internal)
5 V (Internal)
3.3 V (Internal)
90%
24 V
× V )
out out
0.7
FC6A S MICROS
ERIES
U ' M FC9Y-B1722
MART SER S ANUAL