8
HART add-on module
Multidrop:
Multidrop mode is enabled by having the HART short address >0. If the HART short address is
different from 0, the Current output will be forced to 4 mA no matter what the Current output settings
are. This also means that errors can not be signalled.
4.5.2 MASS 6000 When the HART module is inserted, it automatically turns on the Current output with its factory
settings.
The HART device with address „0“ is the only device that is allowed to control the Current output
loop.
Single point:
When only one device is connected to the network, the HART short address should be set to 0.
The Current output is linked to the selected process value. From factory this is Massflow, which
also is mapped to the PV reading. Other selections can be made, this will however not influence
the PV, which is fixed to Massflow.
In single Pant mode the Current output will have the behaviour as described in the table below.
Parameter Selection Comment
Current output: Massflow The Current output is active. This selection is
recommended.
Volumeflow If one of these are selected, the Current output will
Density be linked to this Procees variable. PV will remain
Temperature Massflow!
Fraction A
Fraction B
Pct. Fraction A
OFF The Current output is deactivated. The Current
output is forced to 3 mA to indicate a Warning.
Current output mode: 0-20 mA Not possible.
0 mA can cause HART masters to stop
communicating or report errors. This is because
values below 4mA are used for alarms and validation
of the current loop.
4-20 mA Factory setting.
4-20 mA + Alarm Fatal errors = 1,3 mA
Pending errors = 2 mA
Warning errors = 3 mA
Multidrop:
Multidrop mode is enabled by having the HART short address >0. If the HART short address is
different from 0, the Current output will be forced to 4 mA no matter what the Current output settings
are. This also means that errors can not be signalled.
Parameter Selection Comment
Current output: ON The Current output is active. ON is selected
automatically during power up.
OFF The Current output is deactivated. The Current
output is forced to 3 mA to indicate a Warning.
Current output mode: 0-20 mA Not possible.
0 mA can cause HART masters to stop communi-
cating or report errors. This is because values
below 4 mA are used for alarms and validation of
the current loop.
4-20 mA Factory setting.
4-20 mA + Alarm Fatal errors = 1,3 mA
Pending errors = 2 mA
Warning errors = 3 mA
In single Pant mode the Current output will have the behaviour as described in the table below.
4. Product interfaces
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