Emerson ROC827 - Page 72

ROC800-Series Instruction Manual
3-18 Power Connections Revised July-2017
Table 3-10. Power Consumption of the Discrete Input Module
I/O Module
Power Consumption (mW)
Quantity
Used
Duty
Cycle
Sub-Total
(mW)
Description
P
TYPICAL
DI Module Base
19 mA @ 12 volts dc No
Channels Active
228 mW
Channel 1
3.2 mA @ 12 volts dc
38.4 mW
Channel 2
3.2 mA @ 12 volts dc
38.4 mW
Channel 3
3.2 mA @ 12 volts dc
38.4 mW
Channel 4
3.2 mA @ 12 volts dc
38.4 mW
Channel 5
3.2 mA @ 12 volts dc
38.4 mW
Channel 6
3.2 mA @ 12 volts dc
38.4 mW
Channel 7
3.2 mA @ 12 volts dc
38.4 mW
Channel 8
3.2 mA @ 12 volts dc
38.4 mW
Per Active LED –
Maximum 8
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 Input is active for 15 seconds out of every 60
seconds:
Duty Cycle = 15 seconds  (15 seconds + 45 seconds) = 15 seconds  60 seconds = 0.25