User Documentation

User Manual Managed Switches
28
System Up Time
Indicates how long the Weidmüller switch remained up since the last cold start.
Time Zone
Setting
Description
Factory
Default
User
selectable
time zone
Specifies the time zone, which is used to
determine the local time offset from GMT
(Greenwich Mean Time).
GMT
(Greenwich
Mean
Time)
NOTE: Changing the time zone will automatically correct the current time. Be
sure to set the time zone before setting the time.
Time Server IP/Name
Setting
Description
Factory
Default
1st Time
Server
IP/Name
IP or Domain address (e.g., 192.168.1.1 or
time.stdtime.gov.tw or time.nist.gov).
time.nist.gov
2nd Time
Server
IP/Name
The Weidmüller Switch will try to locate the
2nd NTP Server if the 1st NTP Server fails
to connect.
3.1.7.2 IEEE 1588 PTP
NOTE:
Protocol 1588 PTP is not implemented in the Weidmüller “Value Line”
managed Switches.
The following information is taken from the NIST website at http://ieee1588.nist.gov/intro.htm:
“Time measurement can be accomplished using the IEEE Standard for a Precision Clock
Synchronization Protocol for Networked Measurement and Control Systems (IEEE 1588-2008) to
synchronize real-time clocks incorporated within each component of the electrical power system for
power automation applications.
IEEE 1588, which was published in November 2002, expands the performance capabilities of
Ethernet networks to control systems that operate over a communication network. In recent years an
increasing number of electrical power systems have been using a more distributed architecture with
network technologies that have less stringent timing specifications. IEEE 1588 generates a
master-slave relationship between the clocks, and enforces the specific timing requirements in such