8-1
Section
Error Screens Specific to the DeviceNet Interface Unit
108
8-1
Error Screens Specific to the DeviceNet Interface Unit
The following error messages may be displayed when using a DeviceNet Inter-
face Unit in addition to the regular error screens (error messages) displayed at
the PT.
Message
Likely cause
Remedy
CompoBus/D I/F Unit Communications Error
Faulty communications cable
connection
Check the network cable wiring.
Connection can’t be established with the
DeviceNet Master.
The Master’s power supply is
not ON.
Check the Master’s power supply.
The network power supply is
not ON.
Check the network power supply.
CompoBus/D I/F Unit Communications Error
Faulty communications cable
connection
Check the network cable wiring.
Connection timeout error occurs.
There is a problem with the
Master’s power supply.
Check the Master’s power supply.
CompoBus/D I/F Unit Communications Error
The network power supply is
not ON.
Check the network power supply.
Network power supply error occurs.
The communications cable is
disconnected or broken.
Check the network cable.
CompoBus/D I/F Unit Communications Error
Bus Off error occurs.
Noise
Check the following points and restart
the PT.
•
Are the Master/Slave communications
speeds the same?
•
Are the cable lengths (trunk and
branches) within specifications?
•
Are any cables disconnected, dam-
aged, or loose?
•
Are termination resistors connected
only at each end of the trunk line?
•
Is noise excessive?
CompoBus/D I/F Unit Communications Error
Duplicate MAC ID error occurs.
There is another device with
the same MAC ID.
Reset the node numbers (MAC IDs) to
eliminate duplication and restart the PT.
CompoBus/D I/F Unit Installation Error
An Expansion Interface Unit
is not installed.
Check the DeviceNet Interface Unit’s
installation and restart the PT.
Exponent I/F connection error occurs.
An unsupported Unit is
installed.
Check if the DeviceNet Interface Unit is
installed and restart the PT.
CompoBus/D I/F Unit Hardware Error
Expansion I/F Unit is broken.
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Restart the PT.
Replace the DeviceNet Interface Unit if
the error recurs.
