No communications
between the network
and the card
Communications
cannot be established,
the Ethernet “link” LED
is off, or the Ethernet
“activity” LED flashes
only infrequently or not
at all
• Confirm that the card is running normally (Module Status LED
is not blinking red) and connected to the local Ethernet
network.
• Ensure that the card’s is programmed with compatible network
settings. Consult with your network administrator to determine
the compatible settings.
• Confirm that the destination IP address programmed into the
controller equipment or computer matches that of the interface
card, as displayed by the studio.
• Confirm that intermediate firewalls or routers have been
configured to allow access to the interface via the applicable
TCP/UDP ports.
• Try a known working Ethernet cable and switch.
• If attempting to access the web server on a computer whose
web browser is configured to use a proxy server, ensure that
the proxy server is accessible to the computer, and that the
interface card is accessible to the proxy server.
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