Operating Screens - Siemens SIMATIC HMI TP 170A Equipment Manual

Operating the TP 170A
4.3

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 operating unit 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 and bars, can be 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.
Screen objects
Various screen elements are used to display and operate a screen:
Output fields
Input fields
Texts
Graphics
Status buttons
Bar graphs
Message view
A summary of all the screen objects which a TP 170A project may contain is
provided in Chapter 5.
4-6
CuuDuongThanCong.com
TP 170A Equipment Manual
Release 12/99
https://fb.com/tailieudientucntt