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Troubleshooting the Network
Section 4-2
LED Indicators
Description / Correction
Local Parameter Storage Error
(Valid Configuration Indicator will
be OFF)
An error has occurred, when writing the configuration to the non-volatile memory.
To correct this:
• Restart the Unit.
• Re-download the configuration.
• If the problem persists, replace the PROFIBUS Master Unit.
Local Parameter Load Error
(Valid Configuration Indicator will
be OFF)
An error has occurred, when loading the configuration from the non-volatile memory
to the volatile memory at start up.
Most likely causes:
• A failure or interruption during the writing process.
• A faulty parameter setting, which makes initialization of the PROFIBUS interface
not possible.
To correct this:
• Check the parameter settings for incorrect values.
• Restart the Unit.
• Re-download the configuration.
• If the problem persists, replace the PROFIBUS Master Unit.
File read error is ON
(Valid Configuration Indicator will
be OFF)
An error has occurred, when loading the configuration from the non-volatile memory
to the volatile memory at start up.
Most likely causes:
• A failure or interruption during the writing process.
• A failure during the reading process.
• A faulty Memory Card.
To correct this:
• Check the Memory Card for faults.
• Restart the PLC Unit, to re-download the configuration.
• If the problem persists, use CX-Profibus to re-download the configuration.
Parameter error: ON
(Valid Configuration Indicator will
be OFF)
An error has occurred initializing the PROFIBUS interface, after reading the parame-
ter sets from the non-volatile memory to the volatile memory.
Most likely cause:
• A faulty parameters has been downloaded to the Unit.
To correct this:
• Check the parameter settings in CX-Profibus and correct them if necessary. After
correction, perform a download of the new parameters to the Unit.
Disturbed bus Error: ON
An error has occurred in the PROFIBUS interface, with distorted messages received
by the PROFIBUS Master Unit.
Most likely causes:
• No or invalid termination or no inductors used at high baud rates.
• Faulty wiring.
To correct this:
• Check the termination on the appropriate devices.
• Restart the PLC Unit, to re-download the configuration.
• If the problem persists, use CX-Profibus to re-download the configuration.
• If the problem persists, replace the PROFIBUS Master Unit.