Commissioning
11.8 Time synchronization
Automation system
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System Manual, 12/2017, A5E03461182-AE
The S7-1500 CPUs support the storage of multilingual project texts in up to three different
project languages. If the project texts of a particular project language exceed the reserved
memory space nevertheless, the project cannot be downloaded to the CPU. The download is
aborted with a notice that not enough memory space is available. If this happens, take steps
to reduce the required memory space, e.g. shorten comments.
Note
Size of the SIMATIC memory card
If the memory space needed for downloading projects exceeds the memory space on the
utilized SIMATIC memory card, the download to the CPU is aborted with an error message.
Ensure that your SIMATIC memory card has sufficient memory space for downloading
projects.
You can find information on reading out the memory usage of the CPU and the SIMATIC
memory card in the Structure and Use of the CPU Memory
https://support.industry.siemens.com/cs/de/de/view/59193101/en
) Function Manual.
You can find information on parameter assignment of multilingual project texts in STEP 7 in
the STEP 7 online help.
11.8
Time synchronization
NTP procedure
All CPUs are equipped with an internal clock. The clock always shows the time-of-day with a
resolution of 1 millisecond and the date including the day of the week. The time adjustment
for daylight saving time is also taken into account.
You can update the time of the CPUs using the NTP procedure with an NTP server.
In NTP mode, the device sends time queries at regular intervals (in client mode) to the NTP
server in the subnet (LAN). Based on the replies from the server, the most reliable and most
accurate time is calculated and the time of day on the CPU is synchronized. The advantage
of this mode is that it allows the time to be synchronized across subnets. You can configure
the IP addresses of up to a maximum of four NTP servers. You address a communications
processor or an HMI device, for example, as sources for time synchronization via the IP
addresses.
The update interval defines the interval between the time queries (in seconds). The value of
the interval ranges between 10 seconds and one day. The NTP procedure generally uses
UTC (Universal Time Coordinated). UTC corresponds to GMT (Greenwich Mean Time).
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