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6-16 TCP/IP Ethernet Communications User’s Manual – January 1996
GFK-1004B
Table 6-10. Exception Log Event Codes - Continued
Log Event
Code Possible Cause and Resolution
Event “8”
PLC Driver
events
(Continued)
22 “Backplane communications with PLC fault; lost request”
QAlloc call failed. Entry 4 contains the byte size requested.
23 “Backplane communications with PLC fault; lost request”
BuffAlloc call failed. Entry 4 contains the byte size requested.
24 “Backplane communications with PLC fault; lost request”
Circular mail queue is full and incoming message from the PLC CPU was
lost. Entry 4 contains the number of lost entries so far.
25 “LAN I/F Capacity Exceeded; Discarded Request”
A Dual Port Memory allocation attempt for a given length failed. Entry 4
contains the length of the allocation.
26 “LAN System-Software Fault; Resuming”
An attempt was made to free a Dual Port Memory buffer that is out of
range.
27 “LAN System-Software Fault; Resuming”
An attempt was made to free a Dual Port Memory buffer that is not
allocated.
30 “Backplane communications with PLC fault; lost request”
Could not generate work queue entry. Entry 4 contains the event that was
trying to be scheduled, which is one of the following:
Entry 4 Description
1 Mail message received from PLC
2 Ethernet Interface timed out waiting for a response from the CPU
3 Received mail message for diagnostics task
4 Circular queue full, mail message dropped
5 Retrying VME mailbox initialization
Entry 5 contains additional information related to the event type.
Entry 5 Interpretation
1 Ethernet Interface task ID to which message was sent
2 Index into Data Transfer table of transaction
3 Ethernet Interface task ID to which message was sent
4 Number of messages dropped so far
5 Number of open attempts so far
31 “Backplane communications with PLC fault; lost request”
Backplane Driver scheduled with illegal event. Entry 4 contains the event
code received.
32 “Module state doesn’t permit Comm–Req; request discarded”
Illegal COMMREQ from application program was discarded. Entry 4
contains the command code received.
33 “Module state doesn’t permit Comm–Req; request discarded”
COMMREQ received outside of normal system operation (e.g., while in
the Soft Switch Entry utility).
34 “LAN System-Software Fault; Resuming”
Backplane Driver initializing without Soft Switches from the CPU. This
will occur if the LAN Interface is not configured in the PLC via the
Logicmaster 90-70 Configuration Software.
35 “LAN System-Software Fault; Resuming”
Series 90-70 Ethernet Interface/CPU communications timeout during
restart or load.