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6
6-17
GFK-1004B
Chapter 6 Troubleshooting
Table 6-10. Exception Log Event Codes - Continued
Log Event
Code Possible Cause and Resolution
Event “8”
PLC Driver
events
(Continued)
36 “Module state doesn’t permit Comm–Req; request discarded”
COMMREQs are not allowed if no Soft Switches have been received.
37 “LAN System-Software Fault; Resuming”
A task that has not registered with the Backplane driver is attempting to
send messages to the PLC.
38 (Not reported to CPU Fault Table)
A Backplane driver user’s attempt to send a message to the PLC failed.
Entry 3 indicates the error code returned.
39 (Not reported to CPU Fault Table)
An attempt to release CPU text buffers failed. Entry 3 indicates the status
returned from the Mailbox Utilities.
40 (Not reported to CPU Fault Table)
Backplane driver’s attempt to send a message to the PLC failed. Entry 3
indicates the status code returned from the CPU. See Tables 4–5 through
4-7 for the meaning of this status code.
41 (Not reported to CPU Fault Table)
Backplane driver could not find a state machine for an unsolicited message.
42 (Not reported to CPU Fault Table)
Backplane driver could not find a state machine for a response message.
43 (Not reported to CPU Fault Table)
Backplane driver detected that the CPU firmware revision is too low for
use with TCP/IP configuration mode (soft switches). You must either
configure your Ethernet Interface in MMS-ETHERNET configuration
mode or upgrade your CPU firmware. Entry 4 indicates your CPU’s
firmware revision level while Entry 5 indicates the revision level needed
for TCP/IP configuration mode. Unpredictable operation will result if you
operate with this error.
Event “b”
Service Agent
events
This event is logged when the MMS Service Agent encounters an unexpected
event.
Entry 2 of the logged event contains one of the following error codes.
1 “LAN System-Software Fault; Resuming”
Could not find the index into the Data Transfer Table. This error can occur
when sending any fault table information to the PLC CPU.
2 “LAN System-Software Fault; Resuming”Backplane driver returned a bad
status. Entry 3 contains status code.
3 “Backplane Communications with PLC Fault; Lost Request”
CPU Nacked a request. Entry 3: Major status. Entry 4: Minor Status.
These are error codes returned by the CPU. See Table 16 and 17 in
GFK-0582B.
4 “Backplane Communications with PLC Fault; Lost Request”
A read request returned an unexpected amount of data.Entry 3 contains
the actual data size; Entry 4 contains the expected data size.
5 “LAN System-Software Fault; Resuming”Unexpected “More
follows” condition was indicated by the Backplane driver.
6 “Backplane Communications with PLC Fault; Lost Request”
Unexpected Unsolicited message type was received.Entry 3 contains the
message type code.
7 “Backplane Communications with PLC Fault; Lost Request”
CPU NACKed a request 3 times due to congestion. Entry 3
contains the status code; Entry 4 contains additional status data.