VEGA VEGAPULS 41 Profibus PA - Manual (Page 8)

8 VEGAPULS 41 – Profibus PA
27292-EN-041227
Product description
1.4 Adjustment
Every measurement set-up is unique. For
that reason, every radar sensor needs, be-
side the adjustment, some basic information
on the application and the environment, e.g.
which level means "empty“ and which level
"full“. Beside this "empty and full adjustment“,
many other settings and adjustments are
possible with VEGAPULS radar sensors. The
output of echo curves and the calculation of
vessel linearisation curves by means of ves-
sel dimensions are only two examples.
Profibus adjustment structure
In the Profibus environment, there are differ-
ent adjustment concepts and adjustment
tools which often differ considerably from
manufacturer to manufacturer. From the us-
er’s point of view, the ideal solution would be
a manufacturer-independent adjustment
program which could be operated directly on
the Profibus DP/PA, on the sensor, as well as
at any system node (e.g. an engineering
station or the process control center).
In the past, only the program „SIMATIC
PDM“, based on the HART
® adjustment
structure, could fulfil this wish (though with
the limitations common to HART
® ). As with
HART ® , the availability of an instrument-spe-
cific database for a comprehensive adjust-
ment with PDM (Process Device Managing)
is a requirement. Otherwise, only the basic
instrument functions, such as adjustment, are
available. In the PDM environment, this instru-
ment-specific database is called EDD (Elec-
tronic Device Description), in perfect analogy
to the HART
® environment which also re-
quires, except with VEGA HART ® instru-
ments, a DD (Device Description) for each
sensor.
The disadvantages of the HART ® environment
are well known: for each sensor/participant,
an individual DD must be loaded, which in
addition, must always be the latest and most
up-to-date DD. Special adjustment options
such as e.g. the output of an echo curve, are
available neither with HART
® nor with PDM.
User-friendly adjustment is out of the ques-
tion. With VEGA’s adjustment software VVO,
those restrictions belong to the past.
The legitimate wish of many Profibus users
for a manufacturer-independent adjustment
tool without EDD has been realised in the
form of PACTware
TM . An association of a
number of process technology companies
developed PACTware
TM : a P P P P Process A A A A Automa-
tion C C C C Configuration T T T T Tool that can run different
manufacturer software tools under a stand-
ardized user interface and adjustment struc-
ture. Specialists call this technology Field
Device Transcription (FDT). Just as different
Windows printer drivers enable operation of
completely different printers under a single
user interface, PACTware
TM enables operation
of all field instruments under a single user
interface. Instrument-specific databases
(EDD), like those for SIMATIC PDM, are not
required.
As a result of this development, four adjust-
ment media are available for VEGA Profibus
sensors:
- adjustment with the PC and the adjustment
program VVO (VEGA Visual Operating) as
stand-alone tool, on the segment coupler
or directly on the sensor
- adjustment with the detachable adjustment
module MINICOM in the sensor
- adjustment with the SIMATIC PDM adjust-
ment program (requires EDD instrument
databases) from process control
- adjustment with the manufacturer-inde-
pendent user interface PACTware TM on the
sensor, from process control or on the
segment coupler.