Epson RC90 - Page 304

4. Troubleshooting (PROFIBUS DP)
292 RC700 / RC90 Option Fieldbus I/O Rev.14
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
LED
Color
Light Condition
BF (Physical error)

Green

Red

ON

Blinking

OFF
ST (Communication Status)

Green

Red

ON

Blinking

OFF
(2) Station 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 BF/ST LEDs of all slaves if the master has no status information.
(3) Absent Slave Status: BF/ST LEDs
LED
Color
Light Condition
BF (Physical error)

Green

Red

ON

Blinking

OFF
ST (Communication Status)

Green

Red

ON

Blinking

OFF
(4) Physical Node Location of Absent Slave
PLC
Terminating Resistor ON
Slave
Terminating Resistor ON
Start the examination from this block
when an error occurred here.
Master
Terminating
Resistor ON
Slave Slave
Slave Slave Slave
(5) Error Occurrence Condition
 Immediate occurrence (high reproducibility)
 Rare occurrence (low reproducibility)