Startup Behavior - Siemens SIMATIC HMI TP27 Equipment Manual

Commissioning
13.3

Startup Behavior

Self test
TP starts up
No configuration installed or
SERIAL DOWNLOAD
button pressed?
Yes
No
Download
operation
Initialization
Establish connection
to PLC
Start screen
13-8
After the power supply has been switched on, the Touch Panel per-
forms a self test. During the test, it checks the operability of the most
important TP components and displays the test results. The test re-
sults are then deleted.
If a configuration is not present on the Touch Panel, it automatically
enters Serial Download mode.
The Touch Panel then performs various internal initializations.
During the startup phase, the Touch Panel attempts to establish a
connection to the PLC.
If communication is not possible – for example, because the cable to
the PLC has not been connected – the Touch Panel displays a system
message.
Following startup, the Touch Panel displays the configured start
screen.
TP27, TP37 Equipment Manual
Release 01/00