
Troubleshooting
9-16
SIMATIC 545/555/575 System Manual
9.4 Troubleshooting CPU Non-Fatal Errors
Definitions of non-fatal errors and suggested courses of action are as
follows.
• Scan overrun — The CPU fixed scan time is not sufficient to execute
the user program.
• I/O base failure — A configured base is not connected or has failed.
Check the I/O cabling and the I/O configuration.
• Special function port failure — A communication port on an SF module
has failed. Check all SF modules.
• I/O module failure — A configured module is not present or is reporting
an error. Run AUX 25 or see Appendix C to identify the module.
• I/O table does not agree with modules installed — The configured I/O
does not match what is installed in the base. Check the I/O
configuration and/or run AUX 25.
• Password warning — The CPU has a password that has been disabled
by an operator.
NOTE: Series 505 I/O modules with date codes before January 1988 cannot
be used with a 545/555 CPU. See Appendix B for details on compatibility.
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