i. W
in
= I
in
X E X Input point X Simultaneous ON rate (W)
ii. I
in
: Input current (actual value in case of AC) (A)
iii. E: Input voltage (voltage in actual use) (V)
6. Current consumption of special module power assembly
W
S
= I5V X 5 + I24V X 24 + I100V X 100 (W)
The sum of the current consumption calculated for each block is the total current consumption of the
PLC system.
W = WPW + W5V + W24V + W
out
+ W
in
+ W
s
(W)
Calculate the amount of radiation according to this total current consumption (W) and review the
temperature rising in the control panel. Use the following formula for the calculation of the temperature
rise in the control panel.
T = W / UA [°C]
Where,
W = power consumption of the entire PLC system (the calculated value)
A = surface area of control panel [m
2
]
U: If equalizing the temperature of the control panel by using a fan and others
- 22 -
Chapter 2 - Calculating the power supply for components
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