Emerson ROC827 - Page 71

ROC800-Series Instruction Manual
Revised July-2017 Power Connections 3-17
Table 3-9. Power Consumption of the Analog Output Module
I/O Module
Power Consumption (mW)
Quantity
Used
Duty
Cycle
Sub-Total
(mW)
Description
P
TYPICAL
AO Module Base
100 mA @ 12 volts dc
1200 mW
Jumper set for +T @ 12 volts dc
Channel 1
Channel’s mA current
draw from +T
*
1.25
*
12
Channel 2
Channel’s mA current
draw from +T
*
1.25
*
12
Channel 3
Channel’s mA current
draw from +T
*
1.25
*
12
Channel 4
Channel’s mA current
draw from +T
*
1.25
*
12
Jumper set for +T @ 24 volts dc
Channel 1
Channel’s mA current
draw from +T
*
2.50
*
12
Channel 2
Channel’s mA current
draw from +T
*
2.50
*
12
Channel 3
Channel’s mA current
draw from +T
*
2.50
*
12
Channel 4
Channel’s mA current
draw from +T
*
2.50
*
12
Table Total
Duty Cycle
The duty cycle is based on the average current flow compared to the
full-scale current flow value. To approximate the duty cycle, estimate
the average current consumption in relation to its maximum range. For
example, if an AO channel’s current averages 12 mA:
Duty Cycle = Average mA output  Maximum mA Output = (12  20) = 0.60