Processor or system errors
(Original Document)
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General
These serious faults on either processor (hardware or software), or on X-Bus cabling no longer ensure that the system will function correctly. They cause the PLC to stop in ERROR which requires a cold restart. The next cold restart will be forced into STOP to avoid the PLC falling back into error.
NOTE: When automatic start in RUN is selected in PLC configuration, the restart will be forced in STOP and not in RUN.
Diagnostics table:
State LEDs
System word %SW124
Errors
RUN
ERR
I/O
Off
On
On
H’80’
System watchdog error or error on X-Bus cabling
Off
On
On
H’81’
Cabling error on X-Bus
Off
On
On
System code error, unforeseen error
Overrun of the system task batteries
Overrun of the PL7 task batteries
Legend:
On: on
Off: indeterminate
Diagnostics of processor errors:
When the PLC has stopped in error, it is no longer able to communicate with a diagnostics device. The information relating to the errors is only accessible after a cold restart (see system word %SW124). In general, the information is not used by the user, only the information H’80’ and H’81’ can be used to diagnose a cabling error on the X-Bus.