4. Troubleshooting (DeviceNet)
♦ Causes of Error
Possible Cause Examination Method Countermeasure
{ Slave power OFF Measure the power voltage of the
slaves. (It should be within the range
of sufficient voltage for the slave
operation.)
NOTE: For slaves operating with
communications power
supply, measure voltage at
the DeviceNet connector.
Supply power to the
slave.
{ Broken unit Slave unit replacement Replace the broken
slave unit with a new
one.
4.1.2.1.2 Slave: Communication Error Detection / Busoff Detection / Not-added
MS NS
Master LED Condition Green Light ON Red Light Blinking
(1) Absent Slave LED Condition
(Communication error detection) Green Light ON Red Light Blinking
(2) Absent Slave LED Condition
(Busoff detection) Green Light ON Red Light ON
(3) Absent Slave LED Condition
(Slave not added to the network) Green Light ON Light OFF
Fieldbus I/O Rev.6 83