5. Configuring Ethernet Communications
Issue 06/15 Publication PUB059-002-00 37 of 136
5.2 Ethernet Security
When connecting the master station to an Ethernet network, care should be taken to consider security
of the master station.
There are a number of Ethernet services available in the master station and, where appropriate, the
user should ensure that the Ethernet infrastructure is able to protect the master station from unwanted
access to a service.
Transmission Control Protocol (TCP) and Internet Protocol (IP) are the core protocols utilised in Local
Area Networks (LANs) and computer networking. Within these networks a ‘port’ is an endpoint to a
logical connection – not to be confused with the physical port!
The port number in this case refers to the type of port. For example, port 80 is used for HTTP web
page traffic.
The ports that are available at the master station are:
502, 50003, 50004, 50005,
50006, 50007, 50008 and 50009
Ethernet products, like routers, can prevent other Ethernet equipment on the same LAN from
accessing certain services in the master station. If web page access were not required, the most
secure set up would be to prevent all but Modbus traffic entering the master station.
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