
Troubleshooting
9-14
SIMATIC 545/555/575 System Manual
Troubleshooting CPU Fatal Errors (continued)
When a fatal error occurs, the CPU causing the error attempts to do the
following actions:
• SYSFAIL* is asserted on the VMEbus. This action causes all 575 CPUs
in the system to enter the FAULT mode.
• The SYF LED is turned on.
• The PCG LED is turned off.
• The fault relay is opened.
• I/O ports are disabled, discrete outputs are turned off, and word
outputs are held in their last valid state. (This action can be overruled
by a remote base controller configuration option.)
• Communication ports are cleared and re-initialized.
• Applications are reconnected to their local ports.
• Pending or queued tasks are cleared.
575 CPU Responses
to Fatal Errors
Comentarios a estos manuales