Troubleshooting Controller Non-Fatal Errors - Siemens SIMATIC TI555 System Manual

7.4

Troubleshooting Controller Non-Fatal Errors

TI545/TI555 System Manual
Definitions of non-fatal errors are listed in this section along with suggested
courses of action.
Scan overrun — The CPU 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/or 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.
NOTE: Series 505 I/O modules with date codes before January 1988 cannot
be used with a TI545/TI555 CPU. See Appendix C for details.
Troubleshooting
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