Omron CP1L-EL20DR-D, Operation Manual

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System Configuration and Features Section 6-1
6-1-3 Creating an Original Communications Procedure Using TCP/IP
(UDP/IP) for the Host Application or Communicating with PLCs
from Another Manufacturer
Communications by UDP/
IP and TCP/IP (Socket
Services Function) The standard Ethernet protocols, UDP/IP and TCP/IP, are supported, making
it possible to communicate with a wide range of devices, workstations, com-
puters, and Ethernet Units from other manufacturers.
Up to three ports can be used for various protocols, enabling the use of vari-
ous applications.
Simplified Socket
Services The socket services function for TCP or UDP can be simplified by presetting
parameters and using dedicated bits. In addition, the size of received data
accumulated in the reception buffer is now stored, and a Data Received Flag
has been added. These features eliminate the need for ladder programs to
monitor the timing for completion of socket service processing, and thus
reduce the amount of labor required for program development.
6-1-4 Automatically Adjusting the PLC’s Internal Clock at Regular
Intervals
Operation Use the automatic clock adjustment function.
With the automatic clock adjustment function, the SNTP server's clock is
taken as the standard for automatically adjusting the built-in clock of the PLC.
The adjustment can be regularly executed at a specified time (once a day)
and it can be executed each time by the ladder program.
To use the automatic clock adjustment function, there must be a separate
SNTP server on the network. Aside from the IP address, the host name used
for DNS service can be specified for the SNTP server.
Specification of Servers
by Host Name In addition to directly specifying the IP address for a SNTP server, it is also
possible (by means of the PLC's DNS client function) to specify the server by
host name. This enables automatic searches for IP addresses for purposes
such as system checking, even when the IP addresses for servers have been
changed.
Note A separate DNS server is required to specify servers by host name using
DNS.