Emerson ROC827 Power Consumption of the Discrete Input Modules, Used Cycle DI Module Base

ROC827 Instruction Manual

Table 3-8. Power Consumption of the Discrete Input Modules

I/O Module	Power Consumption (mW)		Quantity	Duty	Sub-Total
	Description	PTYPICAL	Used	Cycle	(mW)
DI Module Base	19 mA @ 12 volts dc No	228 mW
	Channels Active
Channel 1	3.2 mA @ 12 volts dc	38.4 mW
Channel 2	3.2 mA @ 12 volts dc	38.4 mW
Channel 3	3.2 mA @ 12 volts dc	38.4 mW
Channel 4	3.2 mA @ 12 volts dc	38.4 mW
Channel 5	3.2 mA @ 12 volts dc	38.4 mW
Channel 6	3.2 mA @ 12 volts dc	38.4 mW
Channel 7	3.2 mA @ 12 volts dc	38.4 mW
Channel 8	3.2 mA @ 12 volts dc	38.4 mW
Per Active LED –	1.5 mA	18 mW
Maximum 8

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 Input 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 3-14