7 Troubleshooting and Maintenance
7-2
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
7-1 Overview
The CJ1W-PRM21 PROFIBUS Master Unit and CX-ConfiguratorFDT provide extensive means for trou-
bleshooting which can be used to quickly determine errors in the Unit, in the configuration, in the net-
work, and/or in remote slave devices allocated to the Unit.
Troubleshooting on the Master Unit
For troubleshooting purposes, the following error indicators can be used:
• Indicators on the front of the Unit
• Three red error indicators and four status indicators show Unit and network status and errors.
• Device Variables: Unit Status (*_UnitSta) containing status and error flags of the Unit and
Master Errors (*_MstrErrSta) containing error information about the PROFIBUS network and
the PROFIBUS functions of the Unit.
• The Error Log collects error codes for various error events. Serious errors are stored in non-
volatile memory and can be retrieved even after a Unit power down.
• Event Logs in the CPU
This section provides a number of procedures for troubleshooting based on the error indicating
methods listed above.
Troubleshooting the Configuration Software
The Configuration software, i.e. CX-ConfiguratorFDT, the PROFIBUS Master DTM and the Generic
Slave DTM provide several mechanisms for error detection and correction:
• Errors occurring in CX-ConfiguratorFDT are displayed in pop-up message windows and/or
the error log window. The contents of the error log window can be copied to the clipboard to
allow analysis afterwards.
• CX-ConfiguratorFDT provides a FDT communication log window which can be copied to the
clipboard. Analysis of this communication may provide additional information in case errors
occur.
Troubleshooting the network
The PROFIBUS Master DTM and the Generic Slave DTM diagnostics information windows which
can display:
• Indications of errors in the PROFIBUS interface of the Unit
• Indications of errors in the communication between the PROFIBUS Master Unit and remote
slave devices.
• Indications of errors in the remote slave devices, allocated to the PROFIBUS Master Unit.
The CX-ConfiguratorFDT and DTM capabilities for troubleshooting are extensively discussed in sec-
tion 6.
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