Omron CS1W-ETN21 - Manual (Page 135)

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Private and Global Addresses Section 5-3
• With FINS/UDP, when the IP address (private address) of a computer
serving as a DHCP client is changed, the Ethernet Unit's IP address con-
version method will be the automatic generation method (dynamic), the
combined method, or the IP address table method. When FINS/TCP is
used, IP addresses can be changed automatically.
2. Transferring Files
• Files can be transferred, using FTP protocol, between the PLC and a
device such as a personal computer (i.e., an FTP client) with a private
address on the intranet.
• The TCP port number to be used for FTP cannot be used if prohibited by
a firewall in the communications path.
3. Sending Mail
The PLC can send the Ethernet Unit's IP address to the SMTP server by
mail via the intranet.
4. Receiving Mail
The PLC can receive the Ethernet Unit's IP address from the POP3 server
by mail via the intranet.
5. Automatic Clock Adjustment
The PLC can acquire clock data through the Ethernet Unit's IP address
from the SNTP server via the intranet.
6. Host Name Designation
The PLC can acquire the server IP address for the Ethernet Unit's IP ad-
dress from the DNS server via the intranet.
Note Network Security and Firewalls
Setting up an intranet through a global address involves network security con-
siderations. Before doing so, be sure to consult with a network specialist and
consider installing a firewall.
Once a firewall has been set up by a communications company, on the other
hand, there may be some applications that cannot be used. Be sure to check
first with the communications company.