VEGA VEGAPULS 56 Profibus PA - Manual (Page 51)

VEGAPULS 56 Profibus PA 51
Setup
The sensor electronics has two characteris-
tics points (at min. and max.) from which a
linear proportionality between product dis-
tance and the percentage of filling of the
vessel is generated.
Of course, the characteristics points must not
necessarily be at 0 % and 100 %, however
they should be as far apart as possible (e.g.
at 20 % and at 80 %). The difference be-
tween the characteristics points for the min./
max. adjustment should be at least 20 mm
product distance. If the characteristics points
are too close together, the possible measur-
ing error increases. Ideally, the adjustment
would be to carried out, as shown in the
example, at 0 % and at 100 %.
In the menu " Instrument data/Parameter ad-
justment/Conditioning/Linearisation“ you can
enter later, if necessary, a correlation be-
tween product distance and % extent of filling
other than linear (see later subitem
Linearisation).
Scaling
• Click in the menu window " Instrument data
parameter adjustment“ to "Conditioning Conditioning Conditioning Conditioning Conditioning“.
The menu window " Conditioning“ opens.
• Click to " Scaling Scaling Scaling Scaling Scaling“.
The displayed message tells you that you will
find this function on Profibus sensors under
the menu item "
Outputs“ in the menu window
" Instrument data parameter adjustment“.
• Confirm the message with " OK OK OK OK OK“.
• Click in the menu window " Conditioning“ to
" Quit Quit Quit Quit Quit“.
You are again in the menu window " Instru-
ment data parameter adjustment“.
Scaling of the output signal
• Click in the menu window " Instrument data
parameter adjustment“ to "Outputs Outputs Outputs Outputs Outputs“.