Device Variables And Measured Values; System Units; Commissioning; Preliminaries - Endress+Hauser Liquiphant FTL51B Operating Instructions Manual

Commissioning

30
Tertiary variable (TV) parameter (Third variable)
Quaternary variable (QV) parameter (Quaternary variable)
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
Level limit detection
Sensor frequency
Fork state
Sensor temperature
Terminal current
Terminal voltage
The device variables can be queried by a HART
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

WARNING
L
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!
Device variable
®
Liquiphant FTL51B HART
Measured value
Fork state
Sensor temperature
Device variable code
0
1
2
3
5
6
master using HART ® command 9 or
Endress+Hauser
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