Rockwell-automation 1797-OE8H FLEX Ex HART Analog Modules User Manual Instrukcja Użytkownika Pobierz pdf (Strona 80)

Publication 1797-6.5.3 - March 2006

5-4 Calibrate Your Module

1797-IE8H Calibration

Command Structure

Calibration of the HART I/O module is performed using data structures and

MSG Ladder-logic instructions. The MSG instruction sends the data structure

to a dedicated attribute in the FLEX HART I/O module and the associated

response is read from the same attribute. The data structure contains

commands and its associated parameters. Depending on the command, they

are either writable or readable. Only one access, either read or write, is

executable at a time.

The Calibration data structure has four members: Command, Item, Data1, and

Data2.

Table 5.2 Calibration Data Structure

Attribute Field Size Implementation Description Value (Hex) Access

hex

4 byte struct { Conditional Read or write

USINT Command; Calibration

command;

USINT Item; Additional command

information;

USINT Data1; Data according to

command;

USINT Data2; Data according to

command

} Calibration;

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 195 196

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Rockwell-automation 1797-OE8H FLEX Ex HART Analog Modules User Manual Instrukcja Użytkownika Strona 80