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Appendices
A-6
EtherNet/IP Connections from
Windows XP (SP2 or Higher),
Windows Vista, or Windows 7
Better firewall security for Windows XP (SP2 or higher), Windows Vista, and Windows 7 has increased
the restrictions for data communications on Ethernet ports. When using an EtherNet/IP connection to a
CPU Unit from an Ethernet port on a computer, you must change the settings of the Windows Firewall
to enable using CX-Programmer communications.
Precautions for Correct Use
Precautions for Correct Use
Windows Firewall is mainly designed to prevent inappropriate access from external devices (e.g.,
via the Internet). The changes to the Windows Firewall settings described in this document
enable EtherNet/IP connections to be used by the CX-Programmer. If the same computer is
being used on a company network or other network, confirm that the changes will not create
security problems before proceeding with the changes. The changes described in this document
are required only when you connect using EtherNet/IP through an Ethernet port. No changes are
necessary if you are connecting through any other port, such as a USB port.
A-6-1
Changing Windows Firewall Settings
Windows XP
1
When you attempt to connect the CX-Programmer to a PLC on an EtherNet/IP network through
an Ethernet port, the Windows Security Alert Dialog Box will be displayed.
2
Click the Unblock Button.
An EtherNet/IP connection will be accepted from CX-Programmer and EtherNet/IP connections
will be enabled in the future as well.
Windows Vista or Windows 7
Use the following procedure to change the settings before attempting to connect from the CX-Program-
mer.
The User Account Control Dialog Box may be displayed during this procedure. If it appears, click the
Continue Button and continue with the procedure.
1
Select Control Panel from the Windows Start Menu and change the display to Classic View.
A-172
CJ2 CPU Unit Software User's Manual
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