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

Page 187

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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

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Log Event

Code

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Possible Cause and Resolution

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Event “8”
PLC Driver
events
(Continued)

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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

Mail message received from PLC

Ethernet Interface timed out waiting for a response from the CPU

Received mail message for diagnostics task

Circular queue full, mail message dropped

Retrying VME mailbox initialization

Entry 5

contains additional information related to the event type.

Entry 5

Interpretation

Ethernet Interface task ID to which message was sent

Index into Data Transfer table of transaction

Ethernet Interface task ID to which message was sent

Number of messages dropped so far

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.

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