Steps To Clear Fatal Errors; Calling For Assistance - Siemens SIMATIC TI555 System Manual

Troubleshooting Controller Fatal Errors (continued)
Steps to
Clear Fatal Errors
Calling for
Assistance
Troubleshooting
7-8
Attempt to clear the fatal error by following the steps listed below. When the
CPU 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, controller
serial number and software part number (AUX 15) for later reference.
NOTE: 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, ensure that the battery backup is enabled
and then cycle power to the controller. If communication errors continue,
record No Communication as the fatal error, and go to step 4.
2. Execute AUX Function 11 — CPU partial restart. If this fails to clear
the error, execute AUX Function 12 — CPU complete restart.
3. If the fatal error persists, ensure that the battery backup is enabled,
power cycle the CPU, then reattempt step 2 and execute the AUX
Function 10 — CPU power-up restart.
4. If you have been unable to clear the fatal error to this point, you must
re-initialize the CPU. Disable the battery backup (turn off switch 9 of
the dipswitch) and cycle power to the CPU (or execute AUX
Function 10). This clears the CPU memory.
5. If the CPU GOOD LED comes on, restore the battery backup by
turning on switch 9 of the dipswitch. You must now use your
programming unit to restore your program.
6. If the CPU GOOD LED does not turn on at this time, your CPU may
have a hardware failure.
Before calling for assistance, be sure that you have the following
information available.
List of fatal and non-fatal errors
Model number
CPU serial number
CPU software revision (execute AUX Function 15 or check the EPROM
label)
Sequence of events leading up to the failure
TI545/TI555 System Manual