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ROC364 Instruction Manual

1-8 General Information Rev Jun/05

Table 1-2. Power Consumption of the I/O Modules

Power Consumption (mW)

12 Volt 24 Volt

I/O Module

min

max

min

max

QTY

Duty

Cycle

Sub-

Total

(mW)

AI Loop 170 495 170 495

AI Differential 75 75 75 75

AI Source 110 305 130 470

AO Source 145 585 145 585

RTD Input: P

min

is at –50°C

(–58°F); P

max

is at 100°C (212°F)

240 475 475 930

DI Isolated 1 10 1 10

DI Source 1 55 1 205

PI Isolated 1 30 1 30

PI Source 1 70 1 230

Low Level PI 1 45 1 45

SPI Isolated 1 10 1 10

SPI Source 1 55 1 205

DO Isolated 1 25 1 25

DO Source (P

max

is at 57 mA) 30 815 30 1585

DO Relay 12 Volts 20 420 N/A N/A

DO Relay 24 Volts N/A N/A 20 470

HART Interface Module 85 685 85 1285

I/O MODULES TOTAL

NOTES: 1. For analog I/O channels, the Duty Cycle is the percent of time spent in the upper half of the

operating range.

2. The P

max

amount includes any power drawn by a ROC-powered field device such as a

transmitter.

1.5.2 Determining Radio Power Consumption

In determining power requirements for radios:

1. Estimate the Duty Cycle for the radio.

The Duty Cycle is the percentage of time the radio is transmitting (TX). For example, if a radio

is transmitting 1 second out of every 60 seconds, and for the remaining 59 seconds the radio is

drawing receive (RX) power, the Duty Cycle is:

Duty Cycle = TX time ÷ (TX time + RX time) = 1 sec ÷ 60 sec = 0.0167

2. Calculate the total power consumed by a radio, obtain the power (P) consumption values for

transmit and receive from the radio manufacturer’s literature, then use the following equation to

calculate the power consumption for a particular Duty Cycle:

Power = (P

x Duty Cycle) + [P

(1 – Duty Cycle)]

3. Determine the power consumption for all radios that use power from the ROC, and enter the total

calculated value in the Sub-Total column in Table 1-1.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 145 146

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