
Publication 1761-UM006E-EN-P - August 2005
Troubleshooting 9-3
Troubleshooting Using the
LED Indicators
The ENI/ENIW status LEDs provide a mechanism to determine the
current status of the ENI/ENIW if a programming device is not present
or available. The LED behavior is described in the following table.
Table 9.4 Series A/B LED Indicators
LED Description Color State Indicates
RS-232
TX/RX
RS-232 data
transmission
indicator
green flashing data is being transmitted or received over the RS-232 port
off no RS-232 traffic
POWER module power green on module is powered
off module may not be powered
LINK Ethernet link
status
green on the module detects a valid Ethernet connection
off the module does not detect a valid Ethernet connection
Ethernet
TX/RX
Ethernet data
transmission
indicator
green flashing
steady
During normal operation (Fault LED is off) the Ethernet port is transmitting or
receiving NetLinx packets. For example, if you use “Ping” or “Telnet”, the Ethernet
TX/RX LED will not flash.
(1)
flash
sequence
When the Fault LED is on steady, the Ethernet TX/RX LED flashes the following
error codes:
• ROM Error - 1 flash, then off
• RAM Error - 2 flashes, then off
• Net Controller Error - 3 flashes, then off
• EEPROM error: 4 flashes, then off
• Duplicate IP: 5 flashes, then off
When the FAULT LED is flashing, the Ethernet TX/RX LED flashes the following
error codes:
• Faulty Network Connection: 4 flashes, then off
• ENI/ENIW Not Configured: 5 flashes, then off
• Unspecified Fault: off
off no Ethernet traffic
FAULT fault condition
indicator
red on lit when a fault condition is present, possible causes
• ROM Checksum Error
• RAM Test Error
• Network Controller Error
• EEPROM Checksum Error
• Duplicate IP
(see Ethernet TX/RX LED behavior above for error codes)
flashing one of the following:
• faulty network connection
• ENI/ENIW does not have a valid IP address
off hardware is functioning normally
(1) Indicates Ethernet network traffic to/from the ENI/ENIW.
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