Siemens Simatic Field PG Manual page 84

Configuring the SIMATIC Field PG
Resume Time
Resume On Modem
Ring
After Power Failure
5-18
Time for automatic restart
Enabled wakes the system up when an
incoming call is detected on your modem.
[Stay Off] After power failure the device is not switched
on automatically.
[Last State] Provided it was switched on prior to a power
failure, the device is switched on again
[Power On] Restores the previous power state before
loss occured.
SIMATIC Field PG Manual
A5E00075760-04