Module Hardware Diagnostics
(Original Document)
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LED Indicators
The 140 NOC 771 01 Ethernet communication module displays the following LED indicators:
LED Descriptions
Use the LED display to diagnose the state of the module, as follows:
LED
Color
Description
Active
Green
  • Off: Indicates that the module is not communicating with the CPU over the backplane.
  • Steady Green: Indicates that the module:
    • has just been turned on and has not yet started the LED power-up test, or
    • is communicating with the CPU over the backplane
Mod Status (Module Status)
Green/ Red
  • Off: Power is not being supplied to the module.
  • Steady Green: The module is operating normally.
  • Blinking Green: The module has not been configured.
  • Steady Red: The module has detected a major event.
  • Blinking Red: The module is not properly configured.
Net Status (Network Status)
Green/ Red
  • Off: Power is not being supplied to the module or the module does not have an IP address assigned.
  • Steady Green: The module has established at least one CIP connection.
  • Blinking Green: The module has obtained an IP address but has not established any CIP connections.
  • Steady Red: The module has detected that its IP address is a duplicate IP address.
  • Blinking Red: One or more exclusive owner CIP connection (with the module as target) have timed out. All the timed-out exclusive owner CIP connections have not yet been re-established.
Ready
Green
  • Off: No power is supplied to the module.
  • Steady Green: Indicates that the module is operating normally.
  • Two flashes: The MAC address is missing.
  • Three flashes: The Ethernet link is not connected.
  • Four flashes: The module has detected a duplicate IP address.
  • Five flashes: The module is waiting for a served IP address.
  • Six flashes: The module is using its default IP address.
  • Seven flashes: The module has detected a configuration error.
NOTE: If more than one diagnostic condition exists simultaneously, the Ready LED displays the shortest flash sequence.
Link
Green
  • Off: An Ethernet link has not been established.
  • Steady Green: An Ethernet link has been established
Activity
Green
  • Off: There is no receive or transmit activity.
  • Flashes Green: Indicates activity.
100Mb
Green
  • Off: No 100Mb Ethernet link is detected.
  • Steady Green: The module connected with a 100Mb Ethernet link.
Fduplex (Full Duplex)
Green
  • Off: The module is not connected to a full duplex Ethernet link.
  • Steady Green: Indicates that the module is connected with a full duplex link.