Epson RC90

4. Troubleshooting (DeviceNet)
RC700 / RC90 Option Fieldbus I/O Rev.14 263
♦ 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.
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