VEGA VEGAPULS 56 Profibus PA - Manual (Page 10)

10 VEGAPULS 56 Profibus PA
Product description
In practice, the adjustment program VVO is
often installed as a tool on an engineering
station or operating station. VVO then ac-
cesses all VEGA sensors directly over the
bus via the Profibus interface card (e.g. from
Softing) as Master Class 2, from the DP level
to the PA level (via segment coupler) right
down to the individual sensor.
Beside the instrument master file (GSD), with
which a sensor is logged into the Profibus
system, the majority of all Profibus sensors
requires for adjustment, beside the specific
adjustment software, also a so-called EDD
(Electronic Device Description) for each
sensor, in order to access and adjust the
sensor from the bus levels. This is not the
case with VVO. The adjustment software
VVO can communicate at any time with all
VEGA sensors without the help of a special
database. Of course, all other non-Profibus
VEGA sensors can be adjusted with the
adjustment software as well (4 … 20 mA
sensors or VBUS sensors). With VEGA sen-
sors, it is not necessary to go looking for the
latest EDD. This is the basic prerequisite for
a manufacturer-independent adjustment
program, like PACTware
TM , anticipated by
many users, see following pages.