Siemens SIMATIC TI500 Specifikace stáhnout pdf (Strana 229)

Troubleshooting

9-9

SIMATIC 545/555/575 System Manual

The CPU enters a fatal error condition and ceases operation if one of the

problems listed below occurs. AUX 29 displays the problem that caused the

CPU to enter the fatal error condition.

• Hardware failure — This error occurs if the power-up or user-requested

diagnostics have detected a hardware problem other than those listed

here.

• Invalid control block / S-Memory is inconsistent — An error has been

detected in a control block being accessed by a loop, analog alarm, SF

program, or SF subroutine. The most likely cause of this error is that

S-Memory has been corrupted.

• Operating system fatal error — The CPU has detected a logic error

during execution of the operating system firmware.

• RAM diagnostic failure / O/S RAM — The system has detected a RAM

error while running diagnostics on System RAM, Image Register RAM,

or Image Register Force RAM. This is a hardware failure.

• ROM diagnostic failure / O/S ROM — The system has detected a ROM

checksum error while running diagnostics on System EEPROM. This

is a hardware failure.

• Watchdog timeout — There are two possible reasons for this error.

First reason: The scan watchdog expired during execution of the RLL

scan. Using AUX 14, check to verify that the scan watchdog has been

set to a sufficient value. Note that an incorrectly tuned system may

experience this error if the cyclic RLL task (TASK 2) or the interrupt

RLL task (TASK 8) consume a high percentage of available CPU time.

You may need to increase the scan watchdog, increase the cycle time for

TASK 2, reduce the amount of RLL executed in TASK 8, or some

combination of these changes.

Second reason: The hardware has failed in such a way as to prevent

scan operation.

Fatal error due to EEPROM — This error occurs on a 545 or a 555, if

an installed EEPROM has a program which is invalid for the CPU. The

most likely cause of the error is that the memory configuration

contained in the installed EEPROM is invalid. For example, an

EEPROM that was created by a 555–1104 has been installed in a

545–1103 and the 555 program requires memory that is not available

on the 545–1103.

Causes of CPU

Fatal Errors

545/555 Fatal Errors

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Siemens SIMATIC TI500 Specifikace Strana 229