OMRON APPENDIX A – Configuring a PC for remote connection
Release 2.0 Page 263
APPENDIX A
Configuring a PC for remote connection
The OPC interface and CX-Supervisor Communications Control use a Microsoft technology called
DCOM. This allows the Clients and Servers to be seamlessly ‘Distributed’ over a PC network. The
Server should be running on the PC with direct connection to the Device or Device network.
However, the Client, or indeed multiple Clients, can be run on different networked PCs and will
automatically read and write data over the PC network. To do this, the PC running the Server must
be correctly configured. If necessary refer to your OPC server documentation. For full details of
DCOM configuration and security issues see your Microsoft documentation. The following is a
quick guide:
Note: Although DCOM connections can be achieved using Windows 98 and ME they are
more difficult to configure, and offer less functionality. For best results always use
Windows NT or Windows 2000.
Configuring a Client PC running Windows XP Service Pack 2
Windows XP Service Pack 2 includes a communications ‘Firewall’ to protect your computer from
malicious communications. By default, this firewall is turned on, and so will block all OPC and
DCOM communications.
1, 2, 3…
To allow OPC or DCOM communications through the firewall either:
a) Completely disable the firewall as follows. Note can leave your computer
vulnerable to attack so consult your computer documentation or IT
administrator if you are unsure:
1. Open Control Panel followed by Computers.
2. Right click My Computer and select Security Center
3. Select Windows Firewall
4. On the General tab choose option Off
b) Alternatively, on the Exceptions tab you can configure specific programs to
permit communications
All other required settings are the same as for running standard Windows XP as explained below.
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