Siemens SIMATIC PCS 7 Operating Manual page 129

The address range is set via the toolbar or via the "Settings" dialog in the "Options" menu.
This setting cannot be stored centrally since it is network-specific. The setting must be made
again each time the LifeList is opened.
Scan without diagnostics
The "Start Scan" function is used to start a new scan operation.
Any previous scan result is deleted.
During the first phase of the scan operation, the list of assigned communication addresses is
determined based on the selected address range.
For each assigned address, the scan table contains an object whose icon is initially determined
by whether or not the object is a (bus) master.
Icon
Note
The first phase of the scan operation cannot be interrupted.
During the second phase of the scan operation, identification data is called and entered in the
scan table for each address at which no (bus) master was detected.
Help for SIMATIC PDM (V8.2)
Operating Manual, 02/2014, A5E33203676-AA
Meaning
Network
(Bus) "master" device
"Local master" device (own PC)
Device without EDD assignment
Communication error
Device with EDD assignment
Device after diagnostics run (result: Good)
Device after diagnostics run (result: no diagnostic support)
Additional icon meanings can be found in Overview of Device Icons (Page 124)
Functions
7.7 LifeList
129