A6175 ROC800-Series Remote Operations Controller Instruction Manual

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ROC800-Series Instruction Manual
Revised Jul-14 Power Connections 3-21
Table 3-13. Power Consumption of the High and Low Speed Pulse Input Module
I/O Module
Power Consumption (mW) Quantity
Used
Duty
Cycle
Sub-Total
(mW)
Description PTYPICAL
PI Module 21 mA @ 12 volts dc No
Channels Active 252 mW
Channel 1 7.4 mA 88.8 mW
Channel 2 7.4 mA 88.8 mW
Per Active LED –
Maximum 4 1.5 mA 18 mW
Jumper set to +T @ 12
volts dc
1.25 * Measured Current
Draw at +T Terminal
Jumper set to +T @ 24
volts dc
2.5 * Measured Current
Draw at +T Terminal
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 * (Signals Duty Cycle)] ÷ (Total Time Period)
For example, if a Pulse Input receives a signal for 6 hours over a 24-
hour time period and the signal’s wave form is on time for 1/3 of the
signal’s period:
Duty Cycle = [6 hours * (1 ÷ 3)] ÷ (24 hours) = 0.0825