When Communication With Dp-Slaves Is Not Possible - Mitsubishi Electric Melsec Q Series User Manual

9
TROUBLESHOOTING

9.3 When Communication with DP-Slaves Is Not Possible

The following shows the troubleshooting procedures when communications between the
QJ71PB92V and DP-Slaves are not possible.
Communication with DP-Slave is not possible.
Are PROFIBUS cables wired
terminator connected to the terminal
station of the network? Or is the specified bus
terminator used?
Is the PROFIBUS-DP
network configuration correct?
(No. of connected modules, etc.)
Has each station connected to
PROFIBUS-DP been powered ON?
Is the RUN LED on QJ71PB92V ON?
Is the PRM SET LED on QJ71PB92V OFF?
Is the FAULT LED on QJ71PB92V OFF?
9
- 6 9.3 When Communication with DP-Slaves Is Not Possible
correctly?
Yes
Is a bus
Yes
Yes
Yes
Yes
Yes
Yes
1)
Figure 9.5 Troubleshooting When Communications with DP-Slaves Are Not
No
Check the PROFIBUS cable connections.
Section 5.5
(
Check the bus terminator and connect it.
No
Section 5.5.1
(
No
Check the PROFIBUS network configuration.
Section 2.2, Section 2.3
(
No
Power ON each station.
No
Hardware failure of the QJ71PB92V. Please consult
your local Mitsubishi representative.
(The PRM SET LED is ON.)
Write the parameters to the QJ71PB92V.
(The PRM SET LED is flashing.)
No
The written parameters are invalid or corrupted.
Refer to "Error Check Using the LEDs and
Corrective Actions", and take corrective actions.
Section 9.1
(
No
Check the Local station error information area and
take corrective actions.
)
)
)
)