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Troubleshooting

9-13

SIMATIC 545/555/575 System Manual

When a fatal error occurs, the CPU attempts the following actions:

• The CPU GOOD LED is turned off.

• I/O ports are disabled, discrete outputs are turned off, and word

outputs are held in their last valid state.

• Communication ports are cleared and re-initialized.

• Pending or queued communication tasks are aborted.

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 29 from the

Auxiliary Function Menu on your programming unit. Record the fatal

and non-fatal error(s) listed along with the date, time, CPU serial

number and software part number (AUX 15) for later reference.

If communication errors occur, ensure that the battery backup is

enabled and then cycle power to the base. If communication errors

continue, record No Communication as the fatal error, and go to step 4.

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

execute AUX 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 AUX 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 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.

545/555 CPU

Responses to Fatal

Errors

Steps to Clear

545/555 Fatal Errors

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Siemens SIMATIC TI500 Especificaciones Pagina 233