Epson RC90 Manual page 271

4.1.1.2 Checking Network Status
(1) Master Status: MS/NS LEDs
(2) Node Number of Absent Slaves
(3) Absent Slave Status: MS/NS LEDs
(4) Physical Node Location of Absent Slave
Communications
Power Supply
A communication time out error occurred.
(5) Error Occurrence Condition
RC700 / RC90 Option Fieldbus I/O Rev.14
LED
MS (Module Status)
NS (Network Status)
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.
LED
MS (Module Status)
NS (Network Status)
Master PLC
Branch Tap
Branch Tap
Terminating
Resistor
 Immediate occurrence (high reproducibility)
 Rare occurrence (low reproducibility)
Color
 Green  Red
 Green  Red
Color
 Green  Red
 Green  Red
Slave
Slave
Slave
4. Troubleshooting (DeviceNet)
Light Condition
 ON  Blinking  OFF
 ON  Blinking  OFF
Light Condition
 ON  Blinking
 ON  Blinking
Slave Slave
Start the examination from this
block when the error occurred here.
 OFF
 OFF
Terminating
Resistor
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