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4. Troubleshooting (DeviceNet)
4.1.2 Problems and Countermeasures
Master Unit LED
MS NS
Error Description [Reference]
Green
Light ON
Green
Light ON
Normal
communication
- Normal condition
Green
Light ON
Green
Light
Blinking
During connection
establishment
- Processing connection establishment
(The NS LED will be ON in green in a few seconds.)
- Master function in stop state
(When communication does not start, master analysis
with NetMeter is required.)
Green
Light ON
Red Light
Blinking
Communication
error
[Refer to the section 4.1.2.1 Master: Communication
Error.]
- Slave disconnected from the network (Remote I/O
communication error)
- Slave not added to the network (Scan list collation
error)
- Communications power supply OFF (Error detection
after the communication establishment)
Green
Light ON
Red Light
ON
Busoff detection
Duplicate MAC ID
[Refer to the section 4.1.2.2 Master: Busoff
Detection.]
- Busoff detection: Communication stopped due to
critical error.
- Duplicate MAC ID: The MAC ID configuration was
duplicated. (This error occurs only during unit start-
up)
Green
Light ON
Light OFF Unestablished
communication
[Refer to the section 4.1.2.3 Master: Unestablished
Communication.]
- No slave (Error detection before communication
establishment)
- Communications power supply OFF (Error detection
before the communication establishment)
- Duplicate MAC ID: The MAC ID configuration was
duplicated.
Red Light
Blinking
No Matter Configuration error - Master unit configuration error
Refer to the respective device manuals.
[Refer to the section 4.1.2.4 Master: Configuration
Error.]
When EPSON RC+ was configured as a master:
- Slave disconnected from the network (Remote I/O
communication error)
- Slave not added to the network (Scan list collation
error)
- Duplicate MAC ID: The MAC ID configuration was
duplicated.
Red Light
ON
No Matter Module error - Broken master unit → Unit Replacement
Light OFF Green
Light
Blinking
Absent slave [Refer to the section 4.1.2.5 Absent Slave.]
- No slave (Error detection before communication
establishment)
- Communications power supply OFF
Light OFF Light OFF Uninitialized
network
Absent slave
[Refer to the section 4.1.2.6 Uninitialized Network.]
- Master unit start-up error
- No slave (Error detection before communication
establishment)
- Communications power supply OFF
80 Fieldbus I/O Rev.6