Remote Communication In The Internet - Siemens S7-300 User Manual

Of course you can use ETH Adapter CN to simulate each PLC as a COM port on the PC in order to
achieve the data communication and monitoring operation between PC and multiple PLC s

8. Remote communication in the internet

ETH Adapter CN can achieve the worldwide remote communication through the Internet, it
will use the external network IP address of the router, the router external network address is
different when the router is started every time, because the router will be randomly assigned to one
IP address from the Internet when it 's powered every time, so this will result in trouble for remote
communication through the Internet, There are two following methods to solve this problem:
Apply to buy a fixed IP address from the Telecom or Internet operators, the fee will be higher.
Use the dynamic domain name resolution(DDNS). you can apply for a free or paid domain name
from dynamic domain name service provider, then use domain name instead of IP address; so that
regardless of changes in IP address, domain name will point to IP addresses in real time, like as
we usually visit the website .
Some providers such as Changeip.com and other dynamic domain name (DDNS) service
providers offer free and paid dynamic domain name service, you can consult them for their
dynamic domain name service and charges issue. Firstly you need to apply a dynamic domain
from DNS service provider , and download the Dynamic DNS client software, run this software on
the host of Server mode(PC or router with DNS function).After the client software has been
successfully started, Server host has solved the problem of dynamic IP address. Input the
dynamic domain name in the IP input box of Client remote host, set the DNS server IP address as
the local DNS server IP addresses, then you can use the dynamic domain name to visit the
internet.
In the following example, use our free dynamic domain name:kollew.changeip.com, use the PC in
Server-side and run the dynamic domain name client software, you can also use a router with the
function of dynamic domain name .
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