Epson RC90 Manual page 278

4. Troubleshooting (DeviceNet)
4.1.2.2 Master: Busoff Detection
Green
Light ON
266
Master Unit LED
MS NS
Red Light Busoff detection
ON
Duplicate MAC ID
Error
Communication stopped due to critical
error.
The MAC ID configuration was
duplicated. (This error occurs only
during unit start-up)
RC700 / RC90 Option Fieldbus I/O Rev.14
Description