Rosemount Tank Radar Rex
Chapter 3 Device Description
3-28
Service Manual
308012En, Ed.2
May 2013
3.3.9
Level value pick-up
There are several DAU functions which require level data from the
associated RTG:
•
The optional DAU local display can show tank level measured by
the associated RTG.
•
In order to calculate a correct product temperature, it is necessary
to exclude the temperature sensors above the product surface
from the calculations.
The DAU constantly listens to the communication that takes place on the
TRL/2 Field Bus. The DAU is able to detect a query for level data to its
associated RTG.
The following process takes place when a master sends a query for a
level value to an RTG connected to the TRL/2 bus:
1
The Field Communication Unit (FCU) acting as a
master
on the
TRL/2 Field Bus, sends a query for level data to the RTG.
2
The RTG and its
associated DAU
detect the query for
level data.
3
The RTG, acting as a
slave, replies with
the current level
value.
4
The associated DAU
picks up the level
value that is sent by
the associated RTG
to the FCU.
Note!
A prerequisite for the DAU to correctly pick-up level data from the
associated RTG is that the address of the RTG is known by the DAU.
Figure 3-21. DAU level pick up
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