Emerson ROC827 User Manual

ROC800-Series Instruction Manual
Revised July-2017 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
P
TYPICAL
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

Emerson ROC827 Specifications

General

Brand	Emerson
Model	ROC827
Category	Controller
Language	English