H5-7
5.3.3 Calculation Example of Power Capacity
Power module selection is depending on the sum of current consumption of all modules. Therefore, user must
know the current consumption of each module. Please refer to the above table, which has the maximum current
consumption of each expansion module.
Before power module selection, we need to calculate the total current consumptions. Calculations need to be
divided into two sections, DC5V (Bus Power) current consumption and DC24V (Bus Power) current consumption.
User must consider the match between power and expansion modules cannot cause BusPower output power of
any one group of overload use.
Example 1: The below diagram is a system modules, try to calculate the power supply used of the system.
Result
Internal 5VDC logic power
supply
-120 -223 +722 -119 -40 -25 +195 (OK)
Internal 24VDC logic power
supply
－ － +325 -124 -136 － +65 (OK)
External 24VDC Sensor
power supply
－ － +295 -162 － -53 +80 (OK)
Result: (1) First calculate current consumption of internal 5VDC logic power supply
+722mA - 120mA - 223mA - 119mA - 40mA - 25mA = +195 mA (OK)
(2) And then calculate current consumption of internal 24VDC logic power supply
+325mA - 124mA - 136mA = +65 mA (OK)
(3) Calculate current consumption of external 24VDC Sensor power supply
+295mA - 162mA - 53mA = +80 mA (OK)
In conclusion, the total current consumption of the above five modules cannot exceed the total current consumption
of the main unit, so do not need to expand any power supply module.
Example 2: The below diagram is a system modules, try to calculate the power supply used of the system.
Result
Internal 5VDC logic
power supply
-120 -223 +722 -119 -40 -40 -25 +155 (OK)
Internal 24VDC logic
power supply
－ － +325 -124 -136 -136 － -71 (overload)
External 24VDC
Sensor power supply
－ － +295 -162 － － -53 +80 (OK)
FBs-
CM55E
FBs-
B2DA
FBs-
24MC
FBs-
60XYR
FBs-
16YR
FBs-
6AD
Unit : mA
Unit : mA
FBs-
CM55E
FBs-
B2DA
FBs-
24MC
FBs-
60XYR
FBs-
16YR
FBs-
16YR
FBs-
6AD
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