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Troubleshoot Your ControlNet Communication Modules
Publication CNET-UM001C-EN-P - November 2005
Module and I/O Status Indicator Interpretation
Status indicators provide information about the card and the network when
you are connected via the BNC connectors.
• Steady - indicator is on continuously in the defined state.
• Alternating - the two indicators alternate between the two defined
states at the same time (applies to both indicators when viewed
together); the two indicators are always in opposite states, out of phase.
• Flashing - the indicator alternates between the two defined states
(applies to each indicator viewed independent of the other); if both
indicators are flashing, they flash together, in phase.
Keep in mind that the Module Status indictor reflects the
IMPORTANT
module state. For example: self-test, firmware update, and
normal operation but no connection established. The
network status LEDs, A and B, reflect network status.
Remember that the host is able to engage in local
messaging with the card although it is detached from the
network. Therefore, the Module Status LED is flashing
green if the host has successfully started the card. Note,
however, that until the host removes reset, all LEDs on the
daughtercard will remain off.
When you view the indicators, always view the Module
Status indicator first to determine the state of the
daughtercard. This information may help you to interpret
the network status indicators. As a general practice, view all
three status indicators (Module Status, I/O Status, and
Network Status) together to gain a full understanding of
the daughtercard's status.
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