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ROC800-Series Instruction Manual

Revised Jul-14

Power Connections

3-15

3.2.1 Tuning the Configuration

The PM-12 Power Input module can supply a maximum of 60 W

(60,000 mW) to the backplane. The PM-24, when operating between

–40

°

C to 55

°

C, can supply a maximum of 30 W (30000 mW) to the

backplane. Across its entire operating range (–40

°

C to 85

°

C) the PM-24

can supply 24 W (24000 mW). The PM-30 Power Input module can

supply a maximum of 70 W( at 11 volts dc ) (70,000 mW) to 80W(at 30

volts dc) (80,000mW) at -40°C to 75°C to the backplane.

Refer to

Table 3-5

and the value you entered in the Total for ROC800

Base Unit and All Modules line. That is the value against which you

“tune” your configuration to accommodate your Power Input module. If

your configuration requires more power than the Power Input module

you intend to use, you need to modify your I/O module configuration to

reduce your power requirements.

Tuning Hints

Review the content of

Tables 3-6

through

3-20

. Suggestions to help

you better align the configuration of your ROC800 with the capability

of the Power Input module you intend to use include:

Reduce the +T usage by providing an external power supply for as

many transmitters or field devices needed to reduce the value in the

Total for ROC800 Base Unit and All Modules line on

Table 3-5

to

below the capability of the Power Input module you intend to use.

Reduce the +T usage by reducing the number of transmitters or field

devices.

Reduce the total number of I/O modules by consolidating

transmitters or field devices onto as few I/O modules as possible.

Note

:

Tuning your I/O module configuration may require several

iterations to rework the content of

Tables 3-6 through 3-18

until

your power requirements match the capability of the Power

Input module you intend to use.