Siemens SIMATIC TI525 Hardware And Installation Manual page 90

STARTUP / TROUBLESHOOTING
Attempt to clear the fatal error by following the steps listed below. When the PC
GOOD LED turns on, the fatal error has been cleared.
1. Determine the fatal error condition by selecting AUX Function 29 from
the Auxiliary Function Menu on your programming unit. Record the
fatal and non-fatal error(s) listed along with the date, time, and PLC
serial number for later reference.
Always execute AUX Function 29 and make a list of
the errors before attempting to clear them. If you
clear errors before listing them, it will be impossible
to determine what errors occurred and difficult to
identify the problem that caused them.
If communication errors occur, cycle power to the PLC. If
communication errors continue, record "No Communication" as the
fatal error and go to step 4.
2. Execute AUX Function 11 — PLC partial restart. If this fails to clear the
error, execute AUX Function 12 — PLC complete restart.
3. If the fatal error persists, make certain that the battery backup is
enabled and execute AUX Function 10 — PLC power-up restart.
4. If you have been unable to clear the fatal error to this point, you must
re-initialize the PLC. This clears the PLC memory.
For a TI535, disable the battery backup (turn off switch 1 of DIP 2) and
cycle power to the PLC (or execute AUX Function 10).
For a TI525, power down and remove the PLC from the base. Disable
the battery backup (turn off switch 1 of DIP 2), insert the PLC in the
base, and power up.
5. If the PC GOOD LED comes on, restore the battery backup by turning
on switch 1 of DIP 2. (For a TI525, you must power down again and
remove the PLC from the base to re-enable battery backup.) You must
now use your programming unit to restore your program.
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Hardware and Installation User Manual
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