Siemens SENTRON 3WA, Системное руководство

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Modbus TCP
5.10 System time with SNTP
3WA Air Circuit Breaker Communication
46
System Manual, 11/2021, 92310000004-02
5.10.4 Parameters
SNTP mode
• SNTP mode Off
– The COM190 system time is not synchronized with an NTP time server.
• SNTP mode Active:
– The SNTP client sends SNTP requests once an hour to synchronize the COM190 system
time.
If an SNTP query is not answered, the SNTP client queries after 1 minute, after 5
minutes, and then every 15 minutes repeatedly, until the NTP server responds.
– If the NTP server address is zero, no synchronization requests are output and the
COM190 system time is not synchronized.
– On system start, the SNTP client immediately sends an SNTP query.
– If the SNTP client configuration is changed to active mode, the client immediately
sends an SNTP query.
– If the IP address of the NTP time server is changed while the SNTP client is in active
mode, the client immediately sends an SNTP query.
• SNTP mode Passive:
– The SNTP client accepts NTP broadcasts from NTP servers and synchronizes the
COM190 system time.
– If the NTP server address is zero, NTP broadcasts from any source are accepted.
– If the NTP server address is not zero, only NTP broadcasts from the configured address
are accepted.
NTP server address
The input format of the NTP server address is hexadecimal.
Example
IP v4 address as hexadecimal address:
IP v4 address:
192.108.219.111
192 108 219 111
CO A8 DB 6F
IP v4 address as hexadecimal address:
COA8DB6F
SNTP port
The SNTP service uses the default SNTP port 123 (UDP) and this cannot be changed.