Troubleshooting when the status ok led is on – GE GEFanuc Automation Programmable Control Products TCP/IP Ethernet Communications for the Series 90t-70 PLC GFK-1004B User Manual

Page 180

6-9

GFK-1004B

Chapter 6 Troubleshooting

Count

- The Count column contains a repetition count for the event. If events which are

identical occur regularly, they might otherwise flood the log with useless entries.
Instead of recording each repeated event in detail, the log simply keeps the time of the
latest event and a count of the number of repetitions of the repeated event. Log entries
are retained on restart and reloads of the Ethernet Interface.

Entry

- The Entry columns contain detailed information about the event and is

subdivided into 6 entries, Entry 1 - Entry 6.

Troubleshooting When the STATUS OK LED is ON

Sometimes problems can occur even when the STATUS OK LED is ON, indicating
normal operation. In this case, follow the troubleshooting procedure below.

Table 6-7. Troubleshooting with ONLINE LED OFF

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LED Indicators

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Possible Cause and Resolution

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The ONLINE
LED is OFF

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This indicates that an attempt to send a frame resulted in a local fault indica-
tion. This usually results from a hardware problem. If this occurs follow the
procedure below.

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Check to be sure the LAN ONLINE Soft Switch is set to “YES”. By

issuing the Soft Switch Station Manager command checking the
Network Online field.

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Check to be sure the drop cable is securely fastened to the controller

board connector and to the transceiver.

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Make sure the transceiver is securely fastened to the Ethernet

network

trunk

cable.

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Issue a TALLY L Station Manager. If either the MacErr or the

SQEErr tally is non-zero, the local station may be experiencing an
unstable network. In this case follow the procedure below.

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If this station is the only one experiencing problems:

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Verify that the SQE jumper is enabled on the transceiver connected

to the Ethernet Interface.

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Re-tighten all transceiver cable connections.

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Make sure the slide lock on the Ethernet Controller board is locked.

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Replace the transceiver cable with a known good cable.

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Verify that the Series 90-70 PLC power supply is properly grounded.

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Make sure that the Ethernet Controller board ground safety wire is

securely fastened.

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Replace the transceiver with a known good transceiver.

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If all stations are experiencing the problem, the cable plant is probably
at fault.

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Recertify the cable plant.

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If the problem still exists, call GE Fanuc Automation for support.