Omron CJ Series User Manual

7 Troubleshooting and Maintenance
7-8
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
Note The table above assumes that the RUN and the PRM indicators are ON and the ERH indica-
tor is OFF. Otherwise, refer to section 7-2-2 Unit Startup Errors, section 7-2-3 Unit Opera-
tional Errors or section 7-2-4 Unit Configuration Errors.
Flashing/Lit Not lit Not lit Not a valid combination.
Lit A Bus disturbance error has been
detected.
This indicates a termination error (ter-
mination resistors are missing or
inductors are not used) or two slave
devices with the same address.
• Switch the Unit to OFFLINE mode.
• Terminate the network at the appro-
priate places (see section 2-3-2 Bus
Termination).
• Check if any other faulty devices
are on the same network.
• Switch the Unit to CLEAR / OPER-
ATE mode again.
Flashing None of the allocated slave devices
responds to the master’s request
messages.
None of the slaves is in I/O data
exchange with the Master Unit.
This may indicate a loose network
connector on the Master Unit, or a
broken cable.
• Switch the Unit to OFFLINE mode.
• Check the network wiring.
• Check if any other faulty devices
are on the same network.
• Check if actual slave addresses
match the configured addresses.
• Check if the slave parameter set-
tings are correct. If necessary
change them, and download them
again.
• Switch the Unit to CLEAR / OPER-
ATE mode again.
Lit Not-Lit There are no errors. The Unit is in CLEAR or OPERATE mode and exchang-
ing data.
Lit Not a valid combination.
Flashing At least one slave device has
responded to the master’s request
messages and is not in Data
Exchange. There is also at least one
slave which has either
• not responded to the master’s
requests messages, or
• been parameterized incorrectly.
• Switch the Unit to OFFLINE mode.
• Check the network wiring.
• Check if any other faulty devices
are on the same network.
• Check if the slave parameter set-
tings are correct. Re-download after
correction.
• Switch the Unit to CLEAR / OPER-
ATE mode again.
BST COMM BF Probable Cause Correction

Omron CJ Series Specifications

General

Brand	Omron
Model	CJ Series
Category	Controller
Language	English