Omron CJ Series Operation Manual page 239

The probable error causes are then listed to the right of the third column.
BST COMM
Not lit Not lit
Lit
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
BF Probable Cause
Not lit The PROFIBUS Master Unit is in
OFFLINE or STOP mode. No com-
munication over the network.
Lit A hardware error has occurred in the
PROFIBUS interface of the Unit or a
master device has been detected
beyond the Highest Station Address.
The Unit has switched to OFFLINE.
This indicates faulty wiring, broken
message, short-circuits, faulty bus
timings or an active device has been
detected beyond the Highest Station
Address setting (HSA).
A protocol error has occurred in the
PROFIBUS interface of the Unit, the
Unit has switched to OFFLINE.
This indicates lost tokens.
A Double-Address error has occurred
on the network, i.e. there is a second
master device with the same PROFI-
BUS address on the network. the Unit
has switched to OFFLINE.
Not lit Not a valid combination.
Lit Not a valid combination.
7 Troubleshooting and Maintenance
Correction
Switch the Unit to either CLEAR or
OPERATE mode.
• Check the network wiring, and
make sure it is correct (not too long,
long stub lines, etc.)
• Check for short-circuits.
• Check the bus timing set in CX-
ConfiguratorFDT.
• Check the HSA setting in the DTM's
Bus Parameter tab. Set it to the
highest master address which is on
the network.
• Check if any other faulty devices
are on the same network.
• Switch the Unit to CLEAR / OPER-
ATE mode again.
• Check the network wiring, and other
master devices on the network.
Make sure they are all correct.
• Check if any other faulty devices
are on the same network.
• Switch the Unit to CLEAR / OPER-
ATE mode again.
• Check the master devices on the
network. Make sure they all have
unique network addresses.
• After correction, switch the Unit to
CLEAR / OPERATE mode again.
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