Overview; Specifications; Automatic Clock Adjustment - Omron CJ1W-EIP21 Operation Manuals

10 Automatic Clock Adjustment

10-1 Automatic Clock Adjustment

10-1-1 Overview

With the EtherNet/IP Unit, clock information is read from the SNTP server at the specified time or when
the Clock Information Adjustment Switch variable is changed to TRUE. The internal clock time in the
CPU Unit of the EtherNet/IP Unit is updated with the read time.
Note The SNTP (Network Time Protocol) server is used to control the time on the LAN.
Time information written.
Clock data is obtained from the SNTP server and
written to the CPU Unit at the following times.
• When the Automatic Clock Adjustment Switch
variable is changed to TRUE
• At the specified time
Note In accordance with SNTP protocol specifications, automatic adjustment will not be possible from February 7,
2036. This function will no longer operate in the EtherNet/IP Unit from February 7, 2036 (an error message
will not be displayed).

10-1-2 Specifications

Item
Protocol
Port No.
Access to SNTP server
SNTP Operation Timing
10-2
SNTP server
Automatic clock adjustment
Time query sent.
23:59:59
SNTP client
SNTP
123 (UDP)
However, you can change the port number in the EtherNet/IP Unit Settings on the
Sysmac Studio.
Writes the clock information from the
SNTP server to the local CPU Unit.
Clock information is automatically updated at the following times if the SNTP function
is used.
• When the Adjust Clock Bit variable is changed to TRUE
• At the specified time
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
EtherNet/IP Unit EtherNet/IP Unit
SNTP client
Specification
Obtains the clock information from the NTP
server set up on the Network, and applies the
information obtained to the local CPU Unit.
Ethernet (EtherNet/IP)
SNTP client