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vacon • 26
Layout and connections
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4.6
Time synchronization
4.6.1
Using ID 2551
System time in VACON
®
100 family and VACON
®
NXP/NXS AC drives can be updated by writing 32
bit unsigned value to ID 2551. This value is seconds since 1.1.1970 (Unix time). In VACON
®
100
family, the default timezone is UTC. Local time can be configured by changing the timezone and
setting the daylight saving mode. VACON
®
NXP/NXS AC drive does not have time settings, so value
written to this ID must be local time.
4.6.2
SNTP (Simple Network Time Protocol)
Simple Network Time Protocol enables usage of network time servers. Date and time information
is requested from the time server and set as system time. With SNTP, you can keep all devices in
your network in same time. This device acts as SNTP client. One use case for SNTP is that fault
history time stamps can now be compared between drives, enabling better fault tracing, for
example, detecting, in which order the drives were faulted. Synchronized date and time also enables
drives to automatically do programmed operations based on time information.
SNTP has two modes: Poll and Listen Only. Both also have modes where failure to update time will
generate fieldbus fault. In Poll mode, option board will request new time information periodically.
Default interval is 200 seconds. Lowest possible value is 30 seconds. This time can be adjusted from
SNTP parameters. In Listen only mode, time broadcast from server is expected every interval. You
can set two SNTP server addresses. For Poll mode, you have to define at least one SNTP server
address. You do not have to set server address in Listen Only mode, but in that case, the time
broadcasts are accepted from anyone who sends them.
When the SNTP client fails to receive time update from server within the time interval, it will first
wait (or request, depending on mode) the interval time again for the update. If it again does not
receive time update, it will change server and request (or wait for broadcast) from the second server.
If it receives the response from the second server, this server will be used until it fails. After device
restart, the SNTP will always first try the server number 1 (if its address has been defined). If the
second server also fails twice, the SNTP moves back to the server number one. If the selected mode
is Poll Fault or Listen Only Fault, a fieldbus fault is generated at this point.
SNTP also has port setting. By default, the SNTP port is 123, but you can change it. In Poll mode,
the requests are sent to this port on the time server. In Listen Only mode, the broadcasts are
listened in this port.
The SNTP monitoring values show the currently used SNTP server and the time since the last
received update. The SNTP status value tells status of the time synchronization. For example, if the
SNTP mode is Poll and you have not defined any SNTP server addresses, the SNTP status will be
"Invalid configuration (3)".
Summary of Contents for optea
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