VEGA VEGACOM 557 Profibus DP - Manual (Page 24)

24 VEGACOM 557 Profibus DP
Limitation of measured values
Parameter setting of the scaling
Parameter setting PC/DCS outputs
Measurement loop in VEGAMET/VEGALOG
Examples of parameter settings: param-
eter, unit
Percent is chosen as parameter and 0.0% as
unit. The measured value 0.0 … 100.0 % is
transferred with these parameters as PC/
DCS value 0 … 1000.
Percent is chosen as parameter and 0.00%
as unit. The measured value
0.00 … 100.00 % is transferred with these
parameters as PC/DCS value 0 … 10000.
Note
The PC/DCS value is always transferred
without decimal point!
The adjustment of the parameter and the unit
can be made separately for each PC/DCS
output and has no influence on the other
outputs of the measurement loop. The pa-
rameter settings are done in the window
„PC/DCS“. This window is reached under
VVO via the menu items „ Instrument data,
Parameter adjustment, “ choose requested
measurement loop, „ Outputs, Display of
measured value ,“ button „Outputs, Display of
measured value and PC/DCS “.
In the window „PC/DCS“, „scaled“ must be
chosen as parameter after the scaling.
Note
The scaling is used by each output of the
measurement loop that applies the parameter
„scaled“. Modifications in the scaling will then
affect all connected indicating instruments!
Transfer error code in the PC/DCS value
From VVO version 2.60, it is possible to
transfer an error code if there is interference
in a measurement loop. The error code is
then transferred in the PC/DCS value instead
of the measur ed value. To have the err or
code transferred in this way , “Transfer failure
messages to PC/DCS “ must be activated in
the window “PC/DCS“.
Adjust limitation of measured values
Further optional parameter settings can be
found in the window „Limitation of measured
values“.
In this window , it is possible to suppr ess
negative measured values, i.e. measured
values <0% are limited to 0%.
As another option, measured values <-10 %
and >110 % can be outputted as a fault si-
gnal.
Note
These options influence all outputs of the
measurement loop!
The window can be reached via the following
menu items: „ Instrument data, Parameter
adjustment,“ select requested measurement
loop, button „ Conditioning and Limitation of
measured values “.
Scaled is selected as parameter . The meas-
ured value 0 … 100 % shall be transferred to
the PC/DCS system as PC/DCS value
10 … 5000. First of all, a scaling must be
carried out for the measurement loop. Via the
menu items „ Instrument data, Parameter
adjustment,“ choose the requested measure-
ment loop, button „
Conditioning and scaling “.