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4. Troubleshooting (EtherNet/IP)
4.3.1.2 Check Network Status
(1) Master Status: MS/NS LEDs
LED Color Light Condition
MS (Module Status) Green Red ON Blinking OFF
NS (Network Status) Green Red ON Blinking OFF
(2) Node Number of Absent Slaves
Absent slaves are disconnected from or not added to the network.
1. See the status flag regarding to the removal and addition if the master has status
information.
2. See the MS/NE LEDs of all slaves if the master has no status information.
(3) Absent Slave Status: MS/NS LEDs
LED Color Light Condition
MS (Module Status) Green Red ON Blinking OFF
NS (Network Status) Green Red ON Blinking OFF
(4) Physical Node Location of Absent Slave
RC420
Slave
Ethernet Switch
Slave
Slave
Slave Slave
Master
Ethernet Switch
A communication time out error occurred.
Start the examination from this block
when the error occurred here.
(5) Error Occurrence Condition
Immediate occurrence (high reproducibility)
Rare occurrence (low reproducibility)
142 Fieldbus I/O Rev.6