VEGA VEGACOM 558 Ethernet - Manual (Page 28)

28 VEGACOM 558 Ethernet
on
PC
VEGALOG
571
!
6.3 Storage of measured values
when connected to LOGBUS
The addressing of measured values for
Modbus systems is "word-oriented". In
VEGACOM 558, a measured value is repre-
sented by two words, whereby the first word
includes the real measured value, the next
higher word the associated status informa-
tion. In the standard, the term "register word”
is also used instead of the term "word”. The
addressing is done via existing library calls
of a PLC (e.g. Modicon).
Measured value image when connected to
VEGALOG 571
DCS output 1
DCS output 2
DCS output 3
DCS output 255
Meas.
value
Meas.
value
x
Meas.
value
y
VEGALOG 571 can administrate up to 255
measurement loops. For the transfer of the
measured values of a measurement loop,
VEGALOG provides up to 255 DCS outputs.
One or several DCS outputs with any index
can be assigned to each measurement loop.
The configuration of VEGALOG 571 is done
with the VEGA adjustment software VVO. The
selected PC/DCS output defines where the
appropriate measured values can be col-
lected from the temporary memory of
VEGACOM 558.
Data image in VEGACOM 558
Temporary memory of
VEGACOM 558