Omron CJ Series Operation Manual page 248

7 Troubleshooting and Maintenance
Indicators
Master Address Duplication Error:
TRUE
(OFFLINE indicator will be ON)
Hardware error: TRUE
(OFFLINE indicator will be ON)
• Auto-Clear enabled: TRUE
• CLEAR: TRUE
• Slave Diagnostics received: TRUE
• OPERATE: TRUE
• Slave Diagnostics received is:
TRUE
• Data Exchange: FALSE
• Auto-Clear enabled: FALSE
 Troubleshooting the Slave Devices
If the Master Status tab indicates problems related to slave devices, their status can be obtained by
checking the Slave Status tab. The figure below shows this tab. As an example a failure of slave
device 2 is shown.
7-16
Description/Correction
A second master device with the same network address has been detected on
the PROFIBUS network. The PROFIBUS Master Unit has switched to
OFFLINE.
To correct this:
• Check the master devices on the network and ensure that they have unique
device addresses.
• After correction, switch the Unit to CLEAR / OPERATE mode again.
A hardware error has occurred in the PROFIBUS interface of the Unit. The
PROFIBUS Master Unit has switched to OFFLINE.
• Most likely causes:
• Faulty wiring,
• Broken messages,
• Short-circuits, or
• Faulty bus timings.
• A master device has been detected beyond the Highest Station Address
(HSA).
To correct this:
• Check the network wiring, and make sure it is correct.
• Check for short-circuits.
• Check the bus timing set through CX-ConfiguratorFDT.
• Check if any other faulty devices are on the same network.
• After correction, switch the Unit to CLEAR / OPERATE mode again.
This combination indicates that one of the slave devices on the network failed
causing an automatic transition to the CLEAR mode.
Check the Monitor - Slave Status tab to see which slave failed.
The Master Unit is still in OPERATE mode but not exchanging data with all its
slave devices. One or more of the slave devices on the network failed.
Check the Monitor - Slave Status tab to see which slave failed.
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)