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Troubleshooting Using LED Indicators
Section 7-2
7-2-4 Unit Configuration Errors
Unit configuration errors are errors which occur during download of the new
configuration, or after restarting the Unit, following a download. The error can
be determined by examining the ERC and the PRM LED indicators.
The error determination procedure uses the table below. To determine the
error
• First find the status of the ERC LED indicator (left column).
• Move one column to the right and find the PRM LED indicator status.
The probable error causes are then listed to the right of the third column.
Unit Configuration Errors
Note 1. The table above assumes that the RUN LED indicator is ON and the ERH
indicator is OFF. Otherwise, refer to section
7-2-2 Unit Start-up Errors
, or
section
7-2-3 Unit Operational Errors
.
2. If the PRM LED indicator is OFF or Flashing, the BST, COMM and BF LED
indicators remain OFF.
ERC PRM Probable cause Correction
Not Lit Not Lit Not a valid combination.
Lit No errors. The PROFIBUS-DP Parameter set is ready for use.
Flashing No errors. A new configuration is being downloaded from the configurator or from the Memory Card.
Lit Not Lit An error has occurred while writing the Parame-
ter sets to the non-volatile memory.
Re-download the Parameter sets from CX-Profi-
bus or the Memory Card.
If the problem persists, replace the PROFIBUS-
DP Master Unit.
During startup the checksum of the Parameter
sets stored in non-volatile memory was found to
be corrupted.
Re-download the Parameter sets from CX-Profi-
bus or the Memory Card.
If the problem persists, replace the PROFIBUS-
DP Master Unit.
During startup the Parameter set stored in non-
volatile memory was correct, but the contents
contains errors preventing the PROFIBUS inter-
face to be initialized correctly.
Check the Parameter set in CX-Profibus and re-
download the Parameter sets from CX-Profibus.
If the problem persists, replace the PROFIBUS-
DP Master Unit.
Lit Not a valid combination.
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