12-3
12 Automatic Clock Adjustment
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
12-1 Automatic Clock Adjustment
12
12-1-2 Specifications
Clock information is updated at the following times.
*1 The clock information is updated if acquiring the NTP server clock information is enabled on the NTP Tab
Page.
*2 According to the option that is selected for the NTP operation timing on the NTP Tab Page.
• NTP clock synchronization is normally performed as follows:
• If the clock deviation is within 128 ms: The clock is synchronized every 0.5 ms.
• If the clock deviation exceeds 128 ms: The clock is synchronized immediately.
• If the NTP operation timing is set for a specified time interval, the timing will not change even if
the time in the CPU Unit is changed during operation. The time information is updated auto-
matically. (For example, if the time interval is set to 60 minutes, the information is updated 60
minutes after the last time it was updated even if the time in the CPU Unit is changed.)
12-1-2 Specifications
Item Specification
Protocol NTP
Port No. 123 (UDP)
However, you can change the port number in the Built-in EtherNet/IP Port Settings on
the Sysmac Studio.
Access to NTP server Writes the clock information from the
NTP server to the local CPU Unit.
Obtains the clock information from the NTP
server set up on the Network, and applies the
information obtained to the local CPU Unit.
NTP Operation Timing Clock information is automatically updated at the following times if the NTP function is
used.
• After links are established when the power supply to the CPU Unit is turned ON
• At specified times or at specified intervals (according to the option selected for the
NTP Operation Timing)
At specified times or at
specified intervals*
2
At specified times or
at specified intervals*
2
When links are
established.*
1
NTP command sent
(clock information update)
NTP command sent
(clock information update)
NTP command sent
(clock information update)
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