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4. Troubleshooting (PROFIBUS DP)
4.2.1.2 Check Network Status
First of all, you should 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.
Maste
r
Terminating
Resistor ON
Slave Slave
Slave Slave Slave
(5) Error Occurrence Condition
Immediate occurrence (high reproducibility)
Rare occurrence (low reproducibility)
Fieldbus I/O Rev.6 113