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Troubleshooting

9-15

SIMATIC 545/555/575 System Manual

Try to clear the fatal error by following the steps listed below. When the

PCG LED turns on, the fatal error has been cleared.

If communication errors occur, ensure that the battery backup is enabled

and then cycle power to the CPU. If communication errors continue, record

“No Communication” as the fatal error and go to step 4.

1. Determine the fatal error condition by selecting AUX 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 CPU serial

number for later reference.

2. Execute AUX 11, PLC Partial Restart. If this fails to clear the error,

execute AUX 12, PLC Complete Restart.

3. If the fatal error persists, ensure that the battery backup is enabled

and execute the AUX 10, PLC Power-up Restart.

4. If you have been unable to clear the fatal error to this point, you must

re-initialize the CPU. This clears the CPU memory.

Disable the battery backup (disconnect the battery) and cycle power to

the base.

5. If the PCG LED comes on, restore the battery backup by reconnecting

the battery. You must now use your programming unit to restore your

program.

6. If the PCG LED does not turn on at this time, your CPU may have a

hardware failure.

Refer to the Preface for information on obtaining technical assistance.

Before calling for assistance, have the following information at hand:

• List of fatal and non-fatal errors

• Model number

• CPU serial number

• CPU software revision (execute AUX 15 or check the EPROM label)

• Sequence of events leading up to the failure

Steps to Clear

575 Fatal Errors

Calling for

Assistance

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Siemens SIMATIC TI500 Especificaciones Pagina 235