Siemens SIMATIC HMI TP 170A Equipment Manual page 27

Operation acknowledgement
As soon as the touch panel detects valid contact with a touch element, it responds
by displaying a visual acknowledgement. An acknowledgment is independent of
communication with the PLC. It is not an indication of the required action actually
having been executed.
The type of visual acknowledgement is dependent on the operating element
touched:
Buttons
In the case of 3D–effect configurations, visual representation is distinguished
according to the statuses touched and untouched . Examples of representation
are illustrated below by means of the Status button:
Touched
Input fields
After an input field has been touched, the system keyboard illustrated in
Figure 4-1 appears as the operation acknowledgement.
Password protected operating elements
If an operating element is touched which has been assigned with a password
protection, without the user having logged in on the operating unit beforehand, a
system message is triggered. The password protected function is not executed.
Further information on this subject is available in the Chapter 5.4.
TP 170A Equipment Manual
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Untouched
Operating the TP 170A
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4-3