Industrial Electronic Devices
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Document code: MN67912_ENG Revision 1.000 Page 17 of 30
Figure 4: “HART Variables” window
HART VARIABLES:
By Pressing the “HART Variables” button from the main window for SW67912 (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 PROFINET 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.
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