Emerson ROC827 Power Consumption of the Analog Output Modules, Used Cycle AO Module Base

ROC827 Instruction Manual

Table 3-7. Power Consumption of the Analog Output Modules

I/O Module	Power Consumption (mW)			Quantity	Duty	Sub-Total
	Description		PTYPICAL	Used	Cycle	(mW)
AO Module Base	100 mA @ 12 volts dc		1200 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 AO channel’s current averages 12 mA:

Duty Cycle = Average mA output ⎟ Maximum mA Output = (12 ⎟ 20) = 0.60

Issued Mar-06 Power Connections 3-13