Troubleshooting The Network; Troubleshooting Parameter Download - Omron CJ Series Operation Manual

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Troubleshooting the Network

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Troubleshooting Parameter Download

The PROFIBUS Master DTM provides clear error messages if downloading of the parameters to the
PROFIBUS Master Unit fails. Failure can be due to any of the following:
• Errors or inconsistencies in the slave parameter sets, which are checked prior to download.
• The Master DTM being unable to establish communication with the CJ1W-PRM21 PROFI-
BUS Master Unit.
• A communication interruption of the process during download.
 Errors in Slave Parameter Sets
The error messages displayed will provide a clear indication of the problem.
A download initiated by the user starts with a check on the slave parameter sets. The Master DTM
will check
• The total number of slave devices assigned which must be at least one slave device.
• The total number of I/O modules per slave which must be at least one I/O module per slave.
• The maximum size of the I/O data size which must not exceed 7168 words.
• The maximum number of I/O modules which must not exceed 4000.
• Any existing overlap in the I/O Areas configured.
• Any existing overlap in the allocated CPU memory areas.
Any of these errors will abort the download process without consequences for the CJ1W-PRM21
PROFIBUS Master Unit.
The error messages associated with these failures are listed in A-5 CX-ConfiguratorFDT Warning
and Error Messages. The list also provides remedies.
 Errors when Establishing Communication
If no errors occurred during the checking phase, the Master DTM will try to establish communication
with the CJ1W-PRM21 PROFIBUS Master Unit through CX-Server. If this fails, an error message
will be displayed indicating a communication problem (see A-5 CX-ConfiguratorFDT Warning and
Error Messages). A failure to establish communication prior to download will have no consequences
for the CJ1W-PRM21 PROFIBUS Master Unit. The list provided in A-5 CX-ConfiguratorFDT Warn-
ing and Error Messages also provides possible remedies.
 Errors During Download
If none of the first two processes result in a failure, downloading will commence. As soon as down-
loading has started the data in the volatile memory of the CJ1W-PRM21 PROFIBUS Master Unit will
be overwritten.
 Recovery After Failing Download
If a failure occurs during the download process which prevents the Master DTM from completing the
process, the user must restart the Unit manually. Restarting the Master Unit will abort the download
process in the Master Unit and recover the previous configuration from its non-volatile memory.
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
7 Troubleshooting and Maintenance
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