Error Handling; Fatal Error Handling - GE PAC8000 series User Manual

Error Handling

4.2
The PNS has two error-handling methods: fatal error handling and PROFINET diagnostics.
4.2.1

Fatal Error Handling

Any failures that occur during powerup or firmware update mode are considered fatal errors.
This includes faults detected on non-critical devices such as the USB port. After successful
power-up of the PNS, only catastrophic errors are treated as fatal.
If a fatal error occurs, the PNS either blinks an error code on its LEDs and sets the modules
into fail safe state (If the modules are configured for failsafe), or restarts automatically,
depending on its configured Fatal Error Action.
When the PNS detects a catastrophic failure it tries to save diagnostic information to non-
volatile storage. This information overwrites any previous diagnostic information in storage.
Only information about the most recent fatal error is retained. This information is available on
future power cycles to be retrieved and sent to GE Intelligent Platforms for analysis.
While diagnostic information is being saved, the PNS blinks its OK LED. The PNS disables
Ethernet and USB communications, so communication with the module is not possible. If the
PNS cannot save the diagnostic information it is considered a failed Save attempt.
After the attempt to store the information has completed (whether it succeeded or failed), the
module either blinks an error code or restarts, depending on how it is configured.
4.2.1.1 Automatic Restart
If the PNS is configured to automatically restart after a fatal error, on the next successful
power-up, a diagnosis alarm is generated to indicate the PNS reset. This alarm turns the
Fault LED on and persists until the PNS is power-cycled. There is no way to clear this fault
other than a second successful restart.
A persistent fatal error that occurs after the PNS has successfully powered up can cause the
module to continually reset itself.
4.2.1.2 Apply Failsafe operation
If the PNS is configured to put the PNS into failsafe when a fatal errors, the PNS goes into
failsafe state. All output modules will also go into failsafe state (if they are configured so).
GFK-2839B
PAC8000* IO PROFINET Scanner User's Manual–September 2017
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