Table of Contents
Advertisement
9 TROUBLESHOOTING
9. TROUBLESHOOTING
For troubleshooting in the Normal service mode (MODE 0) and Extended service
mode (MODE E), the causes of errors, which are located using the status of LEDs, and
measures against the errors are described below.
When the operation is in the Normal service mode (MODE 0) or Extended service
mode (MODE E), the TEST LED indicator and PRM SET LED indicator of QJ71PB92D
go off.
TOKEN Goes OFF
PRM SET Flashes
RSP ERR Goes ON
9 - 1
LED
Status
RUN
Goes OFF
The watchdog timer monitoring
time is exceeded.
SD/RD Flashes at a
There is a slave station with
high rate
which the initial communication
cannot be performed
(The parameter does not match
the actual slave station).
The token is not cycled.
The parameter is not set.
A communication trouble occurs. Read the trouble information from
FAULT Goes ON
• An active slave station is not set
for the parameter.
• A slave station having a station
address overlapped with that of
the master station is set for the
parameter.
• An unexpected error other than
those specified above occurs.
Cause
Please consult your sales
representative.
Please consult your sales
representative.
• Make sure that the PROFIBUS-
DP cable is connected.
• Check the terminating resistance
set switch for correct function.
• Make sure that the station
addresses are not overlapped
with each other.
• Make sure that the HSA does not
exceed the maximum station
address of the network.
Set the parameters using the GX
Configurator-DP.
the communication trouble
information area of the buffer
memory.
Correct the parameters.
(If the FAULT LED indicator does
not go off even when the
parameters are corrected, contact
the nearest branch.)
Please consult your sales
representative.
MELSEC-Q
Corrective Action
9 - 1
9
Advertisement
Table of Contents
