5 Operation
5-50
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
• Determine errors in the unit or the network.
• Troubleshoot the Master Unit and the network.
The Master Status tab indicates the Master Unit’s status. The Master Status 2 box and the Unit Sta-
tus box all indicate errors. These indicators are discussed in section 7-4-2 Troubleshooting the Net-
work using CX-ConfiguratorFDT.
The Slave Status box indicates the overall status of the allocated slave devices.
Master Status
Main indicators in this box are the indicators for operational status of the Master Unit. They indicate
whether the Master Unit is in
• OFFLINE mode,
• STOP mode,
• CLEAR mode, or in
• OPERATE mode
The Data Exchange indicates if I/O data exchange is taking place with at least one slave device.
The Auto Clear enabled indicator and Valid Configuration indicator provide feedback on the I/O con-
figuration downloaded to the Unit.
The figure below shows an example of the Master Status tab in the case of a fully functional net-
work, i.e. there are no errors and all slave devices are exchanging I/O data with the Master Unit.
Slave Status
If any of the allocated slave devices have returned diagnostic information to the Master Unit, the
Slave Diagnostics Received indicator will be lit. In order to determine which slave reported diagnos-
tics, select the Slave Status tab next to the Master status tab.
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