Emerson ROC827 - Manual (Page 60)

ROC827 Instruction Manual
Issued Mar-06 Power Connections 3-16
Table 3-10. Power Consumption of the Discrete Output Relay Modules
Power Consumption (mW)
I/O Module
Description P
TYPICAL
Quantity
Used
Duty
Cycle
Sub-Total
(mW)
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:
ƒ 80 = Number of transitions.
ƒ Hour is the time period.
ƒ An hour contains 3600 seconds.
Calculate the duty cycle as:
Duty Cycle = [(80 * 0.01) ч 3600] = 0.0002