7-7
7 Troubleshooting and Maintenance
CJ-series PROFIBUS Master Unit Operation Manual for NJ-series CPU Unit (W509)
7-2 Troubleshooting with the PROFIBUS Master Unit Indicators
7
7-2-5 Network Errors
The probable error causes are then listed to the right of the third column.
BST COMM BF Probable Cause Correction
Not lit Not lit Not lit The PROFIBUS Master Unit is in
OFFLINE or STOP mode. No com-
munication over the network.
Switch the Unit to either CLEAR or
OPERATE mode.
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).
• 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.
A protocol error has occurred in the
PROFIBUS interface of the Unit, the
Unit has switched to OFFLINE.
This indicates lost tokens.
• 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.
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.
• 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.
Lit Not lit Not a valid combination.
Lit Not a valid combination.
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