Siemens Multi Panel MP270 SIMATIC HMI, Equipment Manual

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MP270 Operation
4-10
MP270 Equipment Manual
Release 01/99
4.4 Operating Screens
What is a screen?
Screens visualize the progress of processes and display specified process values.
A screen contains logically related process data which the MP270 can both display
and modify by operating the individual values.
Screen partitions
A screen is basically composed of static and dynamic sections. The terms “static”
and “dynamic” do not refer to the possibility of dynamically positioning screen
partitions but to the connection to the PLC.
Static partitions, e.g. text and graphics, are not updated by the PLC. Dynamic
partitions, e.g. input and output fields, trend curves and bars, are linked to the PLC
and display current values constantly read in from the PLC memory. Their
connection to the PLC is established by means of tags.
Figure 4-3 illustrates an example of the partitioning of a screen on the MP270.
System messages
Event and alarm
messages
Main area
Fixed window
Icons for softkey functions
Message indicator
Help window
Password entry
Figure 4-3 Example of screen partitioning on the MP270
A summary of all the screen objects which an MP270 configuration may contain is
provided in Chapter 5.