676
(7) Example of calculation of average power consumption
(a) System configuration
(b) 5VDC/24VDC current consumption of each module
(c) Power consumption of power supply module
WPW = 3/7
× (0.64 + 0.05 + 0.05 + 0.065 + 0.55 + 0.33 + 0.11)
× 5 = 3.85 (W)
(d) Total power consumption for 5VDC logic circuits of all module
W5V = (0.64 + 0.05 + 0.05 + 0.065 + 0.55+ 0.33 + 0.11)
× 5 = 8.98(W)
(e) Total of 24VDC average power consumption of the output module
W24V = 0.01
× 24
× 1 = 0.24 (W)
(f) Average power consumption due to voltage drop in the output section of the output
module
WOUT = 0.1
× 0.2
× 16
× 1 = 0.32 (W)
(g) Average power consumption of the input section of the input module
WIN = 0.004
× 24
× 32
× 1 = 3.07 (W)
(h) Power consumption of the external power supply section of the intelligent function
module
WS = 0.12
× 24 = 2.88 (W)
(i) Power consumption of overall system
W = 3.85 + 8.98 + 0.24 + 0.32 + 3.07 + 2.88 = 19.34 (W)
The value of the heat generated in a redundant system (when the Redundant CPU is used) is the sum of the two values for
the control and standby systems, each of which is calculated by the same method as that for the single system.
Module model name 5VDC 24VDC
Q02HCPU 0.64A ----
QX40 0.05A ----
QY40P 0.065A 0.01A
QJ71LP-25 0.55A ----
Q62DA 0.33A 0.12A
Q35B 0.11A ----
QX40 Q62DA
QY40P
Q35B
QJ71LP21-25
Q02HCPU
Q61P-A1
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