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7 Troubleshooting and Maintenance
7-8
CJ-series PROFINET IO Controller Unit Operation Manual for NJ-series CPU Unit (W511)
7-2
Troubleshooting the Network
The PROFINET IO Controller DTM provides clear error messages if downloading of the parameters to
the PROFINET IO Controller Unit fails. Failure can be due to either
•
Errors or inconsistencies in the slave parameter sets, which are checked prior to download.
•
The IO Controller DTM being unable to establish communication with the CJ1W-PNT21 PROFI-
NET IO Controller 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 IO Device parameter sets. The IO Controller DTM will check
•
The total number of IO Devices assigned, which must be at least one slave device.
•
The total number of I/O modules per IO Device, which must be at least one I/O module per IO
Device.
•
The maximum size of the I/O data size, which must not exceed 7168 words.
•
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-PNT21
PROFINET IO Controller Unit.
Errors when Establishing Communication
If no errors occurred during the checking phase, the IO Controller DTM will try to establish communi-
cation with the CJ1W-PNT21 PROFINET IO Controller Unit through CX-Server. If this fails, an error
message will be displayed, indicating a communication problem. A failure to establish communica-
tion prior to download will have no consequences for the CJ1W-PNT21 PROFINET IO Controller
Unit.
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 configuration data in the CJ1W-PNT21 PROFINET IO Controller Unit will be
over written.
Recovery After Failing Download
If a failure occurs during the download process, which prevents the IO Controller DTM from complet-
ing the process, the user must restart the Unit manually. Restarting the IO Controller Unit will abort
the download process in the Master Unit and recover the previous configuration from its memory.
7-2-1
Troubleshooting Parameter Download
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