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MELSEC-Q
8 TROUBLESHOOTING
8.2.9 Send/received data failure
(1) The cyclic transmission data is not normal
Check item Checking procedure
Is the sequence program correct?
Stop the CPU modules of both the sending and receiving stations and turn
the link device of the sending station on and off by GX Developer's test
operation to check whether or not data is sent to the receiving station.
If it is normal, review the sequence program.
If it is abnormal, review the control station's common parameters as well as
the host's refresh parameters.
Are the parameter settings of the control station and remote
master station correct?
Review the range of the link devices assigned to the sending station.
Are the parameter settings of the sending station correct?
Check the settings of the refresh parameters and the station specific
parameters to see in what range of LB/LW/LX/LY of the network module the
device range used by the sequence program is stored.
Are the parameter settings of the receiving station correct?
Check the settings of the refresh parameters and the station specific
parameters to see in what device range used by the sequence program the
range of LB/LW/LX/LY of the network module received from the transmitting
station is stored.
Is the switch setting of the network module correct?
Confirm that the station numbers of the network modules on system A and B
of the redundant system are n and n + 1 respectively.
Is any parameter destroyed?
Rewrite each parameter using DX Developer. If the symptom remains
unchanged after rewriting, create a new project, and rewrite parameters.
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