Emerson ROC827 - Page 73

ROC800-Series Instruction Manual
Revised July-2017 Power Connections 3-19
Table 3-11. Power Consumption of the Discrete Output Module
I/O Module
Power Consumption (mW)
Quantity
Used
Duty
Cycle
Sub-Total
(mW)
Description
P
TYPICAL
DO Module
20 mA @ 12 volts dc No
Channels Active
240 mW
Channel 1
1.5 mA
18 mW
Channel 2
1.5 mA
18 mW
Channel 3
1.5 mA
18 mW
Channel 4
1.5 mA
18 mW
Channel 5
1.5 mA
18 mW
Per Active LED –
Maximum 5
1.5 mA
18 mW
Table Total
Duty Cycle
The duty cycle is the time on divided by the total time, and is
essentially the percent of time that the I/O channel is active
(maximum power consumption).
Duty Cycle = Active time  (Active time + Inactive time)
For example, if a Discrete Output is active for 15 seconds out of every
60 seconds:
Duty Cycle = 15 seconds  (15 seconds + 45 seconds) = 15 seconds  60 seconds = 0.25