Emerson ROC827 Power Consumption of the Discrete Output Modules, Used Cycle Do Module

ROC827 Instruction Manual

Table 3-9. Power Consumption of the Discrete Output Modules

I/O Module	Power Consumption (mW)		Quantity	Duty	Sub-Total
	Description	PTYPICAL	Used	Cycle	(mW)
DO Module	20 mA @ 12 volts dc No	240 mW
	Channels Active
Channel 1	1.5 mA	18 mW
Channel 2	1.5 mA	18 mW
Channel 3	1.5 mA	18 mW
Channel 4	1.5 mA	18 mW
Channel 5	1.5 mA	18 mW
Per Active LED –	1.5 mA	18 mW
Maximum 5

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 ⎟ (Active time + Inactive time)

For example, if a Discrete Output is active for 15 seconds out of every 60 seconds:

Duty Cycle = 15 seconds ⎟ (15 seconds + 45 seconds) = 15 seconds ⎟ 60 seconds = 0.25

Issued Mar-06 Power Connections 3-15