15 Ethernet
15-54
CP2E CPU Unit Software User’s Manual(W614)
15-6 Automatic Clock Adjustment and
Specifying Servers by Host Name
The built-in clock of the PLC connected to the Ethernet can be automatically adjusted, with the SNTP
server clock taken as the standard. Automatic adjustments through the entire system enable the vari-
ous records generated by production equipment to be managed according to clock information and
analyzed.
The PLC can acquire clock information from the SNTP server at a particular time or when a dedicated
bit turns ON, and it can refresh the internal clock information automatically.
Note 1 An SNTP server is required to use this function.
2 SNTP server settings require specialized knowledge, so they should always be handled by the network
administrator.
3 When using the Internet, depending on the condition of the network it may not be possible to acquire the
clock information.
SNTP servers can be specified by host name rather than by IP address by using of the DNS client func-
tion.
This enables automatic searches for IP addresses for purposes such as system checking, even when
the IP addresses for servers have been changed.
Note 1 A DNS server is required to specify servers by IP address.
2 The IP address is specified directly for the DNS server.
15-6-1 Automatic Clock Adjustment Function
15-6-2 Specifying Servers by Host Name
Ethernet
SNTP server
Clock information
CP2E Nîš…îš…-type
CPU Unit
Ethernet
DNS server
Host name
IP address
CP2E Nîš…îš…-type
CPU Unit
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