Time-Of-Day Synchronization By The Ntp Procedure - Siemens SIMOCODE pro Function Manual

Communication
2.4 EtherNet/IP communication
2.4.14

Time-of-day synchronization by the NTP procedure

SIMOCODE pro V EIP has a non-battery-backed realtime clock that can be synchronized via
the NTP procedure.
Network Time Protocol (NTP) is the implementation of a TCP/IP protocol for time
synchronization in networks. The NTP procedure uses hierarchical time synchronization, that
is, an external clock (e.g. SICLOCK TM or a PC in the network) is used for synchronization.
The device transmits time-of-day queries to the configured NTP server at configured time
intervals. Using the responses of the server, the time of day of the non-battery-backed clock
is synchronized in SIMOCODE pro. This ensures that a synchronized time of day is available
shortly after the supply voltage is switched on.
The NTP synchronization is configured with the "SIMOCODE ES (TIA Portal)" configuration
software under "EtherNet/IP Parameters → NTP procedure/synchronization."
The following settings are also made:
● NTP server address: Enter the NTP server address when the "Activate NTP
synchronization" checkbox is selected.
Note
Adoption of the NTP server address
The NTP server address is not accepted until the device has been restarted or after the
supply voltage has been switched off and on again.
● Cyclic update interval: Time interval in seconds at which synchronization of the time of
day with the NTP server is performed
● Time shift: Time difference in minutes between UTC time (UTC = Universal Time
Coordinated) and the time in the device.
Examples:
● Time shift for CET (Central European Time): +60 min
● Time shift for CST (Central Standard Time, North America): -360 min.
If an NTP server address has not been configured or a server was not found on the network,
you can also set the time of day using SIMOCODE ES. To do this, proceed as follows:
Mark the relevant SIMOCODE device in the project navigation window and then select
"Connect online" to establish a direct connection to the device. Expand the list of device
settings by clicking on the arrow on the left of the SIMOCODE device: You can now select
"Commissioning → Command → Set time (= PC time in UTC)" to download the time of day of
your PC to the SIMOCODE device.
If a valid time of day is available (either synchronized by NTP or set via SIMOCODE ES), the
entries in the error buffer/error protocol (i.e. log) will be additionally displayed with the time of
day. In addition, the "Clock set (NTP)" and "Clock synchronized (NTP)" messages are
displayed.
122
SIMOCODE pro - Communication
Function Manual, 11/2018, A5E40508495002A/RS-AC/003