Emerson ROC809 - Page 74

ROC800-Series Instruction Manual
3-20 Power Connections Revised July-2017
Table 3-12. Power Consumption of the Discrete Output Relay Module
I/O Module
Power Consumption (mW)
Quantity
Used
Duty
Cycle
Sub-Total
(mW)
Description
P
TYPICAL
DOR Module
6.8 mA @ 12 volts dc
No Channels Active
81.6 mW
Channel 1
150 mA for 10 mSec
during transition
1800 mW
for 10 mSec
Channel 2
150 mA for 10 mSec
during transition
1800 mW
for 10 mSec
Channel 3
150 mA for 10 mSec
during transition
1800 mW
for 10 mSec
Channel 4
150 mA for 10 mSec
during transition
1800 mW
for 10 mSec
Channel 5
150 mA for 10 mSec
during transition
1800 mW
for 10 mSec
Per Active LED –
Maximum 5
1.5 mA
18 mW for
10 mSec
Table Total
Duty Cycle
The duty cycle is:
[((Number of Transitions in some time period)
*
0.01 sec)]  (Seconds in the period) = Duty Cycle
For example, if a DOR channel changes state 80 times per hour:
 80 = Number of transitions.
 Hour is the time period.
 An hour contains 3600 seconds.
Calculate the duty cycle as:
Duty Cycle = [(80
*
0.01)  3600] = 0.0002