12 Chapter 4 Product Specifications
EC20 Series PLC User Manual
4.7.5 Power Consumption Of Expansion Module
Table 4-11 Power consumption of each expansion module
Max. current consumption
Model
5V/GND 24V/GND 24V/COM
EC20-0808ER 30mA 50mA 50mA
EC20-0808ET 80mA 0 50mA
EC20-4AD 50mA 0 25mA
EC20-4DA 50mA 0
120mA
☆
EC20-4AM 50mA 0
90mA
☆
EC20-4TC 50mA 0 25mA
☆: Refer to the power consumption when the analog output channel port connects with the output. If the current
output port (0~20mA) is not used, the current can be decreased to 50mA.
4.7.6 Power Capacity Calculation In Expansion Connection
Before the PLC connects with an expansion module, users should calculate the current sum of each power supply of
the expansion module, and ensure the current sum is less than the output current provided by the corresponding
power supply of the main module to avoids the over loading of the main module power supply.
Example 1: the main module is EC20-2012BR, at 25°C ambient temperature, two EC20-0808ET, two EC20-4AD,
one EC20-4DA and one EC20-4TC shall be connected to, verifying the feasibility.
Checking computations as following:
Power circuit Current provided by the main module Actual consumed current conclusion
5V/GND 750mA (80×2+50×2+50+50) = 360mA Pass
24V/GND 580mA (0×2+0×2+0+0) =0 mA Pass
24V/COM 460mA (50×2+25×2+110+25) = 285mA Pass
It is obvious that the total power consumption of above expansion module is less than the permission load of the main
module, and the designing scheme is feasible.
Example 2: the main module is EC20-3232BT, at 25°C ambient temperature, three EC20-0808ET, two EC20-4AD,
one EC20-4DA shall be connected to, using 20mA output port and one EC20-4TC.
Checking computations as following:
Power circuit Current provided by the main module Actual consumed current conclusion
5V/GND 350mA (80×3+50×2+50+50)=440mA Un-passed
24V/GND 650mA (50×3+0×2+0+0)=150mA Pass
24V/COM 360mA (50×3+25×2+120+25)=345mA Pass
The sum of the 5V/GND power consumption of the expansion module is 440mA, it is larger than 350mA which is the
upper limit of 5V power supply; although the power consumption of 24V/GND and 24V/COM is less than the
permitted current of the main module, the designing scheme is unfeasible.
The solution to solve the insufficient of power supply capacity is to select the expansion module with self-carried
power source. It can power by itself, also its outputs of 5Vdc/GND, 24Vdc/GND, and 24Vdc/COM can power to the
expansion module added later.
4.8 Programming Tool Of User Program
ControlStar programming system provides the programming, up/down-loading, debugging and monitoring the user
program of the EC20 series PLC. The system also provides abundant help information, which can use ladder
diagram, instruction list and sequence functional diagram to program.
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