7 Troubleshooting and Maintenance
7-6
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
Note 1 The table above assumes that the RUN indicator is ON and the ERH indicator is OFF. Oth-
erwise, refer to section 7-2-2 Unit Startup Errors, or section 7-2-3 Unit Operational Errors.
2 If the PRM indicator is OFF or Flashing, the BST, COMM and BF indicators remain OFF.
Network errors are errors which occur when attempting to startup a network, i.e. the PROFIBUS
Master Unit has been switched to CLEAR or OPERATE mode. The Unit will parameterize the slave
devices and start data exchange. An error in this process can be determined by examining the BST,
COMM and BF indicators.
• The error determination procedure uses the table below. To determine the error
• First find the status of the BST indicator (left column).
• Move one column to the right and find the COMM indicator status.
• Move one column to the right and find the BF indicator status.
Lit Not lit An error has occurred while writing the
Parameter sets to the non-volatile memory.
Re-download the Parameter sets from CX-
ConfiguratorFDT.
If the problem persists, replace the PROFI-
BUS Master Unit.
During startup the checksum of the Parame-
ter sets stored in non-volatile memory was
found to be corrupted.
Re-download the Parameter sets from CX-
ConfiguratorFDT.
If the problem persists, replace the PROFI-
BUS Master Unit.
During startup the Parameter set stored in
non-volatile memory was correct but the con-
tents contains errors preventing the PROFI-
BUS interface to be initialized correctly.
Check the Parameter set in CX-Configura-
torFDT and re-download the Parameter sets
from CX-ConfiguratorFDT.
If the problem persists replace the PROFI-
BUS Master Unit.
Lit Not a valid combination.
7-2-5 Network Errors
ERC PRM Probable Cause Correction
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