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GFK-1084B Chapter 4 Troubleshooting
Table 4-1. PLC Fault Table Descriptions
PLC Fault User Action
Backplane communications with PLC
fault; lost request
User Action: Check to make sure you are not send-
ing COMMREQs faster than the Ethernet Interface
can process them. If problem persists, contact GE
Fanuc Automation.
Bad local application request; discarded
request
User Action: Check for valid COMMREQ command
code. If problem persists, contact GE Fanuc Automa-
tion.
Bad remote application request; discarded
request
User Action: Try to validate the operation of the re-
mote node. If problem persists, contact GE Fanuc
Automation.
Can’t locate remote node; discarded re-
quest
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, Subnet-
work Mask, and default Gateway IP address are
correct.
Connection to remote node failed; resum-
ing 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.
LAN controller Tx underflow; attempt re-
covery
Internal system error. User Action: If problem
persists, contact GE Fanuc Automation.
LAN controller underrun/overrun; resum-
ing
Internal system error. User Action: If problem
persists, contact GE Fanuc Automation.
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.
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.