Troubleshooting Common Ethernet Difficulties; Plc Timeout Errors - GE VersaMax PLC User Manual

13.6 Troubleshooting Common Ethernet Difficulties

Heavy SRTP traffic.
Long PLC sweep time.
PLC Communication Window set to
LIMITED mode.
Ethernet Communications
For public disclosure
Some common Ethernet errors are described below. Ethernet errors are generally
indicated in the PLC Fault Table and the Ethernet exception log. As previously explained
in Using the PLC Fault Table, PLC Faults generated by the Ethernet interface contain
Ethernet exception events within the extra fault data. See the VersaMax Station Manager
Manual, GFK-1876 for detailed descriptions of Ethernet exception events.

13.6.1 PLC Timeout Errors

When the SRTP traffic to the CPUE05 exceeds the PLC's ability to process the requests,
PLC Timeout errors may occur. PLC Timeout errors will take down an SRTP Server
connection; in this case, the remote SRTP client must reestablish a new SRTP connection
to the CPUE05.
This error is indicated in the PLC Fault Table as:
Backplane communication with PLC fault; lost request with exception Event = 8,
Entry 2 = 8
Backplane communication with PLC fault; lost request (no exception Event)
These errors may also be accompanied by either of the following:
Backplane communication with PLC fault; lost request with exception
Event = 8,
Entry 2 = 6
LAN system-software fault; resuming with exception Event = 8,
Entry 2 = 16
The PLC Timeout condition occurs when the CPUE05 cannot process requests within a
specified timeout period. The remedy is to reduce the requests, or increase the processing
capacity in the PLC.
Cause
Reduce the size, number, or frequency of SRTP
requests at the remote SRTP client.
Modify the PLC application to reduce the PLC
sweep time.
Change to RUN-TO-COMPLETION mode.
If none of the above corrective actions is feasible, the timeout interval may be lengthened.
The timeout interval is specified by the "crsp_tmot" Advanced User Parameter. The
default timeout value is 15 seconds. See Configuring Advanced User Parameters in
chapter 6 to change Advanced User Parameter values.
Note that changing this timeout value does not reduce the actual time for the PLC to
process the requests.
Corrective Action
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