Emerson ROC827 - Manual (Page 58)

ROC827 Instruction Manual
Issued Mar-06 Power Connections 3-14
Table 3-8. Power Consumption of the Discrete Input Modules
Power Consumption (mW)
I/O Module
Description P
TYPICAL
Quantity
Used
Duty
Cycle
Sub-Total
(mW)
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