Epson RC90 Manual page 304

4. Troubleshooting (PROFIBUS DP)
4.2.1.2 Check Network Status
As a first step, check the current condition of the network. There are different
specifications of status display LED on a device in the PROFIBUS DP standard. This
section explains how to check the network status assuming that EPSON RC+ is configured
as a master or slave.
(1) Master Status: BF/ST LEDs
BF (Physical error)
ST (Communication Status)
(2) Station Number of Absent Slaves
(3) Absent Slave Status: BF/ST LEDs
BF (Physical error)
ST (Communication Status)
(4) Physical Node Location of Absent Slave
(5) Error Occurrence Condition
292
LED
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 BF/ST LEDs of all slaves if the master has no status information.
LED
Master PLC
Terminating Resistor ON
Slave
Terminating
Resistor ON
Start the examination from this block
when an error occurred here.
 Immediate occurrence (high reproducibility)
 Rare occurrence (low reproducibility)
Color
 Green  Red
 Green  Red
Color
 Green  Red
 Green  Red
Slave Slave
Slave Slave
RC700 / RC90 Option Fieldbus I/O Rev.14
Light Condition
 ON  Blinking
 ON  Blinking
Light Condition
 ON  Blinking
 ON  Blinking
Terminating Resistor ON
Slave
 OFF
 OFF
 OFF
 OFF