Emerson ROC364 Manual de instrucciones descargar pdf (Pagina 11)

ROC364 Instruction Manual

1-7 General Information Rev Jun/05

For an analog I/O channel, the Duty Cycle is approximated by estimating the percentage of

time the channel spends in the upper half of its range (span) of operation. For example, if an

Analog Input wired as a current loop (4 to 20 milliamps) device operates in the upper half of its

range 75% of the time, then 0.75 would be used as the Duty Cycle. If the analog channel

generally operates around the midpoint of its span, use 0.5 as the Duty Cycle.

2. To calculate the total power consumed by an I/O channel, first select either the 12 Volt or 24

Volt column in Table 1-1 or Table 1-2 and read the minimum (P

min

) and maximum (P

max

) power

consumption value from the table for the desired I/O channel.

3. Calculate the power consumption for a channel with the Duty Cycle using the following equation

taken into account:

Power = (P

max

x Duty Cycle) + [P

min

(1 – Duty Cycle)]

4. Multiply this value by the quantity (QTY) of I/O channels with the same Duty Cycle and enter

the calculated value in the Sub-Total column.

5. Repeat the procedure for all other I/O channels used.

6. Total the values in the I/O Modules Sub-Total column in Table 1-2.

7. Enter the I/O Modules Total value in Table 1-1.

8. Calculate the Radio Power Consumption total. Refer to Section 1.5.2, Determining Radio

Power Consumption, on page 1-8.

9. Enter the Radio Power Consumption Total value in Table 1-1.

10. Calculate Total power consumption in Table 1-1.

11. Add the power consumption (in mW) of any other devices used with the ROC in the same

power system, but not accounted for in the tables to the Total power consumption value in Table

1-1. Refer to Section 1.5.3, Totaling Power Requirements, on page 1-9.

Table 1-1. Power Consumption of the ROC364 and Powered Devices

Power Consumption (mW)

12 Volt 24 Volt

Device

min

max

min

max

QTY

Duty

Cycle

Sub-

Total

(mW)

MCU and I/O Module Rack 915 1705 1 N/A

I/O Converter Card

230 N/A N/A

Local Display Panel 25 25 N/A

Serial Communications Card 135 135 N/A

Dial-up Modem Card 395 395 N/A

Leased Line Modem Card 110 110 N/A

Radio Modem Card 110 110 N/A

I/O Modules Total from Table 1-2 N/A N/A N/A

Radio (Section 1.5.2) N/A N/A N/A

TOTAL

NOTE: 1. The power drawn by field devices connected to I/O modules is included in the P

max

figures in Table

1-2.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 145 146

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Emerson ROC364 Manual de instrucciones Pagina 11

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