Siemens SIMATIC NET CP 343-1 Uživatelský manuál stáhnout pdf (Strana 66)

9 Further Notes on Operation

B−66

CP 343-1 Advancedfor Industrial Ethernet / Manual Part B

Release 06/2008

C79000-G8976-C202-04

Notice

If you are using IRT communication, no media redundancy is supported.

9.8 Time-of-day synchronization

General rules

The CP supports the two modes explained below for time-of-day synchronization:

S SIMATIC mode

S NTP mode (NTP: Network Time Protocol)

Note

No automatic changeover to daylight saving is defined in NTP. As a result, you

may need to implement this changeover using a program application.

Notice

Note the following regarding time-of-day synchronization in NTP mode:

If the CP recognizes an NTP frame as being “not exact” (example: NTP server is

not externally synchronized), it is not forwarded to the communication bus. If this

problem occurs, none of the NTP servers is displayed as “NTP master” in the

diagnostics; rather all NTP servers are displayed only as being accessible.

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Siemens SIMATIC NET CP 343-1 Uživatelský manuál Strana 66