5-2
Equipment
Manual OP7, OP17
Release 04/99
5.1 Screen Entries
Screens
consist of entries. Every screen may contain up to 99 entries. Irre
-
spective of the configured number of lines, precisely one entry is displayed
per display page on the OP
. Lines which may have not been fully configured
are displayed as blank lines.
An example of a screen entry is the two lines in the afore mentioned example
(figure 5-1)
Furn1 temp.:
80 °C
Furn1 cont.: 1200 l.
A
screen entry consists of the following components:
entry text
The static text contains explanations for the operator
. It may also include
information on how the soft keys have been assigned.
fields for the
–
output of PLC actual values, date, time,
–
input of PLC tags which are immediately transferred to the PLC after
being entered,
–
combined I/O of PLC tags.
soft keys
Different functio
n c
all
s f
or th
e d
ifferen
t s
creen
s a
r
e a
ssigne
d to t
h
e s
of
t k
eys.
The configuration defines the intervals at which PLC values are updated, i.e.
read again from the PLC and displayed.
W
ith lar
ge screens containing more than 159 actual values or setpoint-actual
values, ”partial screen updating” is automatically enabled. T
o enhance per
-
formance, only those values are updated which are currently present on the
display
. This may mean that an older value is briefly displayed when scrol
-
ling through screen entries. Updating of the visible actual values is faster as a
result, however
.
Output fields display actual values of the PLC in numerical or symbolic
form; input fields define tags in numerical or symbolic form. In input fields,
the flashing cursor is visible.
For symbolic I/O fields, you can configure up to 256 text elements which you
can call on the OP using a selection field and apply to the screen entry
.
W
ith inputs of numerical values, configured number formats and limit values
apply with respect to the number of places before and after the decimal point.
Displaying
a
screen entry
Components of a
screen entry
Updating values in
screen entries
I/O fields
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