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ROC800-Series Instruction Manual
3-16
Power Connections
Revised Jul-14
Table 3-8. Power Consumption of the Analog Input Module
I/O Module
Power Consumption (mW)
Quantity
Used
Duty
Cycle
Sub-Total
(mW)
Description
P
TYPICAL
Analog Input
AI Module Base
84 mA @ 12 volts dc
1008 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 AI channel’s current averages 16 mA:
Duty Cycle = Average mA output
÷
Maximum mA Output = (16
÷
20) = 0.80