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Advant

Smart Device (HART

) Interface User’s Guide

Section 4.2 Operating Overview

3BUR 001 085R0001 REV A 4-3

4.2 Operating Overview

The Advant Smart Device (Hart) Interface is the interface between smart device and CCF data

points. The MOD300 database configurator defines which points should be read from the smart

device, how often and where the points go in the CCF portion of the MOD300 database. CCF

then generates outputs which the Advant Smart Device (Hart) Interface will convert to a

command that is sent to the smart device to perform the output change.

The following diagram (Figure 4-2) briefly outlines the areas of interaction among CCF, smart

device interface, and the MVI board.

4.2.1 I/O

Inputs are scanned (read) at the configured rate for each command. These values are then

entered into the data base and CCF is notified of changes to digital points. Outputs are sent out

(written) whenever they are received by the smart device interface. They take precedence over

inputs until a configurable time (Maximum Read Wait) has elapsed when inputs shall be

requested before outputs. Outputs also have the capability of being grouped together and this is

done on a command basis. Grouping of outputs is the placing of all consecutive commands

which are outputs and the output address falls within a defined window, maximum digital group

or maximum analog group, range. Grouping is used to bring the load on the serial port down

because one command takes less time to process than several individual commands.

Figure 4-2. Advant Smart Device (HART) Interface Overview

CCF

Advant

MVI

HOST CPU

TLL

Smart

Device

Interface

Serial Interface

DPM

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Black Box IC108A Betriebsanweisung Seite 93