The ENI status LEDs provide a mechanism to determine the current status of the ENI if a programming device is not present or available. The LED behavior is described in the following table.
LED | Description | Color | State | Indicates |
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green | flashing | data is being transmitted or received over the | ||
TX/RX | transmission indicator |
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| off | no | ||
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POWER | module power | green | on | module is powered |
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| off | module may not be powered |
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LINK | Ethernet link status | green | on | the module detects a valid Ethernet connection |
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| off | the module does not detect a valid Ethernet connection |
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Ethernet | Ethernet data | green | flashing steady | During normal operation (Fault LED is off) the Ethernet port is |
TX/RX | transmission indicator |
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| transmitting or receiving NetLinx packets. For example, if you use |
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| “Ping” or “Telnet”, the Ethernet TX/RX LED will not flash. |
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| flash sequence | When the Fault LED is on steady, the Ethernet TX/RX LED flashes |
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| the following error codes: |
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| • ROM Error - 1 flash, then off |
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| • RAM Error - 2 flashes, then off |
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| • Net Controller Error - 3 flashes, then off |
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| • EEPROM error: 4 flashes, then off |
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| • Duplicate IP: 5 flashes, then off |
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| When the FAULT LED is flashing, the Ethernet TX/RX LED flashes |
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| the following error codes: |
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| • Faulty Network Connection: 4 flashes, then off |
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| • ENI Not Configured: 5 flashes, then off |
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| • Unspecified Fault: off |
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| off | no Ethernet traffic |
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FAULT | fault condition indicator | red | on | lit when a fault condition is present, possible causes |
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| • ROM Checksum Error |
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| • RAM Test Error |
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| • Network Controller Error |
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| • EEPROM Checksum Error |
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| • Duplicate IP |
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| (see Ethernet TX/RX LED behavior above for error codes) |
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| flashing | one of the following: |
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| • faulty network connection |
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| • ENI does not have a valid IP address |
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| off | hardware is functioning normally |
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