Rockwell Automation Allen-Bradley PanelView Plus 400, Руководство пользователя

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Publication 2711P-UM001D-EN-P - September 2005
6-26 Terminal Connections
DeviceNet Network (NET) Status Indicator
This bi-color (green/red) LED indicates the status of the
communication link.
Condition Status Indication
off not powered Device is not online.
not online The device has not completed the
Dup_MAC_ID test yet.
The device may not be powered; look
at the Module Status LED.
flashing green
(1)
(1)
The flash rate of the LED is approximately 1 flash per second. The LED should be on for approximately 0.5
seconds and off for approximately 0.5 seconds.
online Device is online, but has no
connections in the established state.
not connected The device has passed the
Dup_MAC_ID test, is online, but has
no established connections to other
nodes.
green link okay, online, connected The device is online and has
connections in the established state.
flashing red
(1)
connection timeout One or more I/O connections are in
the timed-out state.
red critical link failure Failed communication device. The
device has detected an error that has
rendered it incapable of
communicating on the network
(Duplicate MAC ID or Bus-off).
Check network integrity and baud
rate of all devices. Then cycle power
to the card by shutting down and
cycling power to your computer.
ATTENTION
Extensive use of Change-of-State connections,
particularly with rapidly changing data, can adversely
impact the available DeviceNet network bandwidth.
If the network bandwith becomes consumed, some
devices may only be able to communicate
intermittently. This can result in timeout errors and
possible loss of data. If timeouts occur, consider
changing the connection type for some of the
Change-of-State connections to Cyclic or Polled.