GE GEFanuc Automation Programmable Control Products TCP/IP Ethernet Communications for the Series 90t-70 PLC GFK-1004B User Manual

Page 191

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6-20

TCP/IP Ethernet Communications User’s Manual – January 1996

GFK-1004B

Table 6-10. Exception Log Event Codes - Continued

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Log Event

Code

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Possible Cause and Resolution

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Event “c”
LLC events
(Continued)

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120* “LAN Controller Fault; Restarted LAN I/F”
or
121* “LAN Interface Hardware Failure; Switched Off Network”:

Fuse F1 on the LAN Controller board, which protects the PLC Power
Supply from overload from the external transceiver, is blown.. This fuse is
not field replaceable. Correct the external fault and replace the LAN
Controller board.

122* “LAN Controller Fault; Restarted LAN I/F”
or
23* “LAN Interface Hardware Failure; Switched Off Network”:

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23* “LAN Interface Hardware Failure; Switched Off Network”:

The MAC chip failed its internal loopback test. Replace the LAN
Controller board.

124* “LAN Controller Fault; Restarted LAN I/F”
or
125* “LAN Interface Hardware Failure; Switched Off Network”:

The MAC chip failed to initialize. Replace the LAN Controller Board.

126* “LAN Controller Fault; Restarted LAN I/F”
or

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126* “LAN Controller Fault; Restarted LAN I/F”
or
127* “LAN Interface Hardware Failure; Switched Off Network”

The MAC reported a “babble” fault; more than 1518 bytes of data have
been transmitted in a frame. Replace the LAN Controller board.

128* “LAN Controller Fault; Restarted LAN I/F”
or
129* “LAN Interface Hardware Failure; Switched Off Network” :

The MAC reported a handshaking error in accessing the LAN Controller

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The MAC reported a handshaking error in accessing the LAN Controller
memory. Replace the LAN Controller board.

12a* “LAN Controller Fault; Restarted LAN I/F”
or
12b* “LAN Interface Hardware Failure; Switched Off Network”:

The MAC reported a broken “chain” of buffers in a transmit frame. Since
the LAN Controller does not chain buffers, this should not occur. Replace
the LAN Controller board. If this fault recurs, please report it to GE Fanuc.

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Same fault for both reports. It is remotely possible that error codes
120 - 12b may occur due to a transient system fault. Because of this
possibility, an attempt is made to recover without manual intervention, by
restarting the LAN Controller (thus rerunning power–up diagnostics). If a
hardware fault is detected, the LAN Controller will be held in reset. To

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restarting the LAN Controller (thus rerunning power–up diagnostics). If a
hardware fault is detected, the LAN Controller will be held in reset. To
prevent repeated restarts and to protect the network, the LAN IF will
instead Switch Offline from the Network (rather than Restart) if this fault
occurs within 5 minutes of startup.

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