Siemens simatic hmi op7, Equipment Manual

Page: 49 / 196

ESC
5-1
Equipment Manual OP7, OP17
Release 04/99
Screens
On the OP, the process – for example, a processing machine or a mixing unit
– is displayed on screens and manipulated. The screens are configured by the
configurer for specific users.
On screens, associated process values are acquired and provide an overview
of a process or system. In addition to this alphanumeric ”imaging” of the pro-
cess, screens provide a means of entering process values and, consequently,
of controlling the process.
Process values on a screen can be randomly assigned to subject-related
groups. An example of this is shown in figure 5-1.
Furn1 temp.: 80
°
C
Furn1 cont.: 1200 l
Furn2 temp.: 78
°
C
Valv2 press: normal
Figure 5-1 Example of Process Values Grouped by Subject on a Screen
Every screen contains
a title (optional, maximum number of characters: display width minus 3),
max. 99 entries.
a return destination reached by pressing
Possible return destinations are
– the message level
– another screen
– a directory
– the point at which the current screen was selected.
Screens can be grouped during configuration in a screen directory, which
is used to display them on screen or print and edit them. A screen can be re-
trieved from its screen directory by its screen number and its screen title, if
configured.
Displaying and
influencing the
process on
screens
Screen
components
Screen directory
5