Date of issue 11/30/07 805639
23
HART Loop Converter KFD2-HLC-(Ex)1.D(.**)
Editing device data: HARTcom
If available, the HLC activates Burst Mode for the HART field device to achieve maximum
communication speed. The HLC uses the universal HART command 3 to retrieve variables (PV, SV,
TV, QV, if available).
8.3.1 Mode
Depending on the setting, the HLC operates as a primary or secondary HART master device according
to HART standards and is fully compatible with each HART handheld terminal and any other HART
master devices.
8.3.2 TimeOut
If the HLC does not receive a valid HART message after the preset time, the fault indication
Communication fault is issued. Time-out range is 5 s to 60 s in increments of 5 seconds.
8.3.3 ShortAddress and LocateMethod
More than one HART field device may be present in a HART loop, as specified in the HART standards.
However, the HLC can only communicate with one HART field device at a time. This field device is
identified during the localization phase.
• If you select LocateMethod fixed, the HLC communicates with the field device that was assigned a
short address under ShortAddress.
• If you select LocateMethod, the HLC runs a search for the shortest address – beginning with the
address assigned under ShortAddress – and then communicates with this device. The device
address is saved to accelerate the next start-up process under ShortAddress.
8.3.4 Rebuild
If the connection to the HART field device is lost, you can use Rebuild to run through the localization
phase without having to switch the HLC off and on again.
Pressing the OK key when On Rebuild is flashing prompts the HLC to start searching for connected
HART devices (see section 8.3.3) in the same way as during start-up.
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