VEGA VEGALOG 571 - Manual (Page 6)

6 VEGALOG 571
1) Input active = Sensor is powered by the EA-card
Input passive = Sensor delivers current
on
VEGALOG
571 EA
!
EA-card
1.3 Module card types
The modular system of VEGALOG 571 con-
sists of different, special module card types:
- CPU-card
- input cards
- output cards
- communication cards
for connection to standard bus systems
- power supply card
for supply of the cards
CPU-card
Product description
on
PC
VEGALOG
571 CPU
!
CPU-card
CPU-card
PC with adjustment program
VEGA Visual Operating
This computer card is the centre of
VEGALOG and has the following functions:
- communication between the individual
cards
- calculating tasks such as scaling, linearisa-
tion, differential generation etc.
- coupling to the PC via RS 232-interface
Furthermore, the CPU is used for level detec-
tion or monitoring of switch on and off times.
Depending on the number of measurement
loops, CPU-cards in different performances
of up to 15, 30, 60 or 255 measurement loops
are available.
The CPU reads cyclically measured values
from the peripheral cards (with, for example,
30 measurement loops in 300!ms-cycle).
These are compared with the programmed
data, standardised and processed. The
programmed data (configuration data, ad-
justment parameters etc.) are available in the
EEPROM, where they remain even in case of
voltage loss. In the memory of the CPU a
process picture is created which is provided
to the peripheral cards via the LOGBUS.
For back-up, the programmed data can be
transferred via the RS 232-interface to the PC
and saved there on the hard drive or on a
diskette.
Input cards
EA-card
Up to 10 sensors can be connected to the
EA-card (input analogue) via active
1) current
inputs 0/4!…!20!mA:
- capacitive electrodes
- hydrostatic pressure transmitters
- vibrating level switches
- conductive electrodes
- process pressure and differential pressure
transmitters
- switching contact (level switch)