Synchronizing the System Time in the
Network
122
7.1
Entering the Time
UM Basic Configuration L3P
Release
7.1
12/2011
7.1 Entering the Time
If no reference clock is available, you have the option of entering the system
time in a device and then using it like a reference clock (see on page 127
“Configuring SNTP”), (see on page 139 “Application Example”).
As a special feature, the device is equipped with a buffered hardware clock.
This clock maintains the current time
if the power supply fails or
you disconnect the decive from the power supply.
Consequently, you have the current time available immediately after the
device has booted, e.g., for log entries.
The hardware clock buffers a power supply down time of 1 hour; under the
condition that the power supply has continuously powered the device for at
least 5 minutes prior to that.
Note: When setting the time in zones with summer and winter times, make
an adjustment for the local offset. The device can also get the SNTP server
IP address and the local offset from a DHCP server.
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