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User Manual PROFIBUS / HART Master
Document code: MN67911_ENG Revision 1.000 Page 18 of 31
Figure 4: “HART Variables” window
HART VARIABLES:
By Pressing the “ HART Variables ” button from the main window for SW67911 (Fig. 2) the window “Definition of HART Variables List”
appears (Fig. 4).
This section is used to define the HART variables to read/write with the PROFIBUS Master.
The means of the fields are:
If the field “ Enable ” is checked, the HART variable is enabled;
In the field “ Device Address ” the address of HART device is defined;
In the field “ Preamble Count ” the number of bytes for the synchronization is defined;
If the field “ Type ” the type of HART parameter is defined;
In the field “ Var/Cmd Number ” the identification of variable/command to read/write is defined. From HART standard, the most used
numbers are:
o
246: Primary Variable;
o
247: Secondary Variable;
o
248: Tertiary Variable;
o
249: Quaternary Variable.
In the field “ Params ” the parameters for the commands are defined;
In the field “ Position ” the starting byte of the internal array where mapping the HART data is defined;