Data Link Failure Of A Specific Station; Data Link Failure In Melsecnet/H Extended Mode - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

8 TROUBLESHOOTING

8.2.5 Data link failure of a specific station

Check item
Monitor the communication status of each station.
Is the network module of the faulty station normal?
Was the loop error caused by the network module or the
data link cable?
Are the control station's parameters correct?
Are the control station's parameters normal?
Are the switch settings of the network module correct?
Is any data link cable disconnected?
1: For the QJ71NT11B, check the station number/mode setting switch.

8.2.6 Data link failure in MELSECNET/H Extended mode

Checkpoint
LINK PARA. ERROR occurs on the control station.
All stations do not start data link.
LINK PARA. ERROR occurs on a normal station.
Specific normal station does not start data link.
Some station does not send the cyclic data of 2000 bytes or
more.
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Perform network monitoring of the network diagnostics of GX Developer,
check for any abnormally communicating station and check the loop status.
Also, check whether or not data linking is stopped.
In case of an optical loop system, check the line condition and
communication status of each station as well, using the loop test of GX
Developer's network diagnostics.
Check whether or not an error or problem occurred in the CPU module and
network module of the faulty station.
Check whether or not the network module works normally with the self-
loopback test of the offline tests.
Check whether or not the data link cable is normal with the station-to-station
test of the offline tests.
Check that the total number of link stations is set to the largest number of the
connected stations or more, and check that the stations that cannot
communicate are specified as reserved stations.
Read the network parameters from the faulty station's CPU module and
check that the network settings such as the network type, start I/O number
and network number are correct.
Check the station number setting switches and mode setting switch.
Perform the network monitoring and loop tests in the network diagnostics of
GX Developer and check the wiring conditions.
Replace the network module on the control station with a network module
that supports the MELSECNET/H Extended mode. (Error code F813
For applicable network modules, refer to Section 2.2.
Make the network type of the normal station matched with the network type
set to the control station. (Error code: F82A
Replace the network module on the normal station with a network module
that supports the MELSECNET/H Extended mode. (Error code F820
For applicable network modules, refer to Section 2.2.
Make the network type of the normal station matched with the network type
set to the control station. (Error code: F82A
Replace the network module on the normal station with a network module
that supports the MELSECNET/H Extended mode. (Error code F820
For applicable network modules, refer to Section 2.2.
Set the network type of the control station to the MELSECNET/H Extended
mode.
In the network parameter (network range assignment) of the control station,
set more than 2000 bytes to send range for each station of the station.
MELSEC-Q
Checking procedure
Checking procedure
)
H
)
H
1
)
H
)
H
)
H
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