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GFK-1541B Chapter 7 Troubleshooting 7-5
7
PLC Fault Table Descriptions
PLC Fault
User Action
Backplane communications with PLC fault;
lost request
User Action: Check to make sure you are not sending
COMMREQs faster than the Ethernet Interface can
process them. If problem persists, contact GE Fanuc
Automation - NA.
Bad local application request; discarded
request
User Action: Check for valid COMMREQ command
code. If problem persists, contact GE Fanuc Automation -
NA.
Bad remote application request; discarded
request
User Action: Try to validate the operation of the remote
node. If problem persists, contact GE Fanuc Automation -
NA.
Can’t locate remote node; discarded request Error reported when message received where IP/MAC
address cannot be resolved. Error may indicate that
remote host is not operational on the network.
User Action: Check that remote host is operational on
network and its addresses are correct.
Comm_req - Bad task ID programmed Message from PLC for unknown Ethernet Interface task.
User Action: Check COMMREQ function block.
Comm_req - Wait mode not allowed User Action: Check COMMREQ to make sure sent in no-
wait mode.
Config’d gateway addr bad; can’t talk off local
net
Error in configuration. Verify IP address, Subnetwork
Mask, and default Gateway IP address are
correct.
Connection to remote node failed; resuming
without it
Underlying communications software detects error
transferring data; resuming. If persistent error,
check connection to LAN and operation of remote node.
LAN controller fault; restart LAN I/F User Action: HW fault, perform power cycle. If problem
persists, contact GE Fanuc Automation - NA.
LAN controller Tx underflow; attempt
recovery
Internal system error. User Action: If problem
persists, contact GE Fanuc Automation - NA.
LAN controller underrun/overrun; resuming Internal system error. User Action: If problem
persists, contact GE Fanuc Automation - NA.
LAN data memory exhausted - check parms;
resuming
The Ethernet Interface does not have free memory
to process communications. User Action: If
problem persists, contact GE Fanuc Automation - NA.
LAN duplicate MAC Address; resuming A frame was received in which the source MAC
Address was the same as this station’s MAC Address. All
stations on a network must have a unique MAC address.
Immediately isolate the offending station; it may be
necessary to turn it off or disconnect it from the network.
This station remains Online unless you intervene to take it
Offline.
LAN controller fuse blown; off network
(Series 90-70 Ethernet Interface (Type 2) and Series 90-
30 CPU364)
The network port fuse is blown; port is
unusable. Isolate and correct the cause of the problem,
then replace the fuse or the Ethernet Interface.