Liquiphant FTL64 HART Commissioning
Endress+Hauser 31
Device variable Measured value
Tertiary variable (TV) parameter (Third variable) Fork state
4)
Quaternary variable (QV) parameter (Quaternary variable) Sensor temperature
1) Primary variable (PV) parameter is always applied to the current output.
2) Level limit detection is the initial state depending on the fork state (uncovered/covered) and the safety
function (MIN/MAX)
3) Sensor frequency is the oscillation frequency of the fork
4) Fork state is the fork state (Fork covered/Fork uncovered)
The assignment of the measured values to the device variables can be changed in the
following submenu:
Navigation: Application → HART output → HART output
In a HART Multidrop loop, only one device may use the analog current value for signal
transmission. For all other devices in the Loop current mode parameter, select the
Disable option.
Navigation: Application → HART output → Configuration → Loop current mode →
Disable option
8.2.1 Device variables and measured values
The following codes are assigned to the device variables at the factory:
Device variable Device variable code
Level limit detection 0
Sensor frequency 1
Fork state 2
Sensor temperature 3
Terminal current 5
Terminal voltage 6
The device variables can be queried by a HART
®
master using HART
®
command 9 or
33.
8.2.2 System units
The oscillation frequency is specified in Hz. The temperature can be displayed in °C, °F or K.
9 Commissioning
9.1 Preliminaries
L
WARNING
The settings of the current output are relevant for safety!
Incorrect settings may cause the product to overflow or a pump to run dry.
‣
The setting for the current output depends on the setting in the Assign PV parameter.
‣
After changing the setting of the current output: check the settings for the range
(Lower range value output (LRV) and Upper range value output (URV)) and reconfigure
them if necessary!
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