VEGA VEGALOG 571 - Manual (Page 7)

VEGALOG 571 7
Product description
The inputs can also be switched passively 1)
and are used for connection of:
- switching contacts with additional current
source
- external current sources 0 … 20 mA
A mixed switching of active/passive 1) inputs
is also permitted within an EA-card.
EV-card
EV-card
AA-card
on
VEGALOG
571 EV
!
on
VEGALOG
571 AA
!
88888 hl
The EV-card (EV = input VBUS) powers up to
15 VBUS-sensors and processes their meas-
ured data:
- hydrostatic pressure transmitters
- ultrasonic sensors
- radar sensors
The digital communication between sensors
and the EV-card enables the connection of
different VBUS-sensors via common two-wire
line. This means that a transmission is avail-
able which is not only optimally adapted to
the conditions of the level measurement, but
also has increased immunity to interference.
In addition to the real transmission of meas-
ured values, it also enables the parameter
adjustment of the sensors via the signal con-
ditioning instrument from the control room
(local parameter adjustments are carried out
via the PC with VVO).
Separators
VEGATRENN 547V Ex
VEGATRENN 548V Ex
The separators are used for galvanic isola-
tion of the intrinsically safe from the not-intrin-
sically safe VBUS-measuring lines, and for
intrinsically safe supply and signal transmis-
sion of Ex-approved VBUS-sensors.
Separators
on
VEGALOG
571 EV
!
Output cards
AA-card