PMA KS 98, Manual

Page: 112 / 246

Text display and entry
Changing the texts displayed in the unit is possible only in the engineering tool!
Max. 16 characters can be entered into each text parameter.
The following values or texts are displayed:
Ü
Block number 3 digits
*
Fixed text or spaces (no access)
Ö
The first 16 characters of ‘Title’
ä
X 100
#
X 0
<
Last stored value
>
Unit for x1 (first 6 characters of ‘Unit’)
y
-100 *
Sample
,
Unit
VTREND operating page
VPARA has an operating page, which can be selected in the operating page menu with
input ‘
hide
‘ not used. VTREND has no operating functions. The operating page is
used exclusively for trend data display
Examples: Trend recording with 2 curves
Although distinction of different curves is not possible,
display of two values on a trend page may be purposeful
(e.g. controller set-point and process value, or one value and
zero, in order to have a curve). In the example, a clock
triggering switch-over between the values together with the
SELV1 is generated by means of a pulse.
For making a record at intervals of a second e.g.
in VTREND,
Unit
is set to s and
Sample
is set to 1.
Settings: Unit = s and
Sample =1
= 1/s = 3600/h
x0=0,
x100
and pulse/h to 3600,
1/2 sample interval = 1800 must be applied
to pulse input x1.
Cascading
Trend or data recording with any number of values can be realized by cascading VTREND function blocks. Limiting re-
fers only to the number of available block numbers and to the calculation time. The data sequence is dependent of
VTREND function block wiring.
Visualization
9499 040 50611
VTREND ( trend display ) 112
:
Ü * Ö
ä
<
y
#
>
Trend curve
Value x ... x-100 Value x-101 ... x-200
the earliest 100
stored values
Example of trend-/datarecording with n-values