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CHAPTER 7 TROUBLESHOOTING
7
7.3 Troubleshooting by Symptom
7.3.5 Items checked when an communication data error is detected
7.3.5 Items checked when an communication data error is detected
(1) Cyclic transmission
(2) Transient transmission
7.3.6 Items checked when a link dedicated instruction does not
complete
Check item Check procedure
Is the sequence program correct?
Change the operating status of the CPU module on the remote master station to
STOP, and forcibly turn on the link devices to be sent to the remote I/O stations with
the device test of the peripheral.
If the remote I/O stations receive correct data, modify the sequence program.
If the remote I/O stations do not receive correct data, change the network parameter
and refresh parameter settings.
Are the parameters of the remote master station
correct?
Check the link device range and I/O assignment of the remote master station. Also,
check the refresh parameter setting to see if the devices used in the sequence
program are consistent with the LX/LY range set to the remote master station. If they
are inconsistent, correct the refresh parameter setting or modify the sequence
program.
Check item Check procedure
Has any error occurred at transient transmission
execution?
Check the error code at the transient transmission execution and take corrective
action. ( Page 91, Section 7.4.2)
Is the targeted station number within the range? Check if the targeted station number is within the range.
Has a redundant system been configured on the
relay station?
Add a program to change the routing parameter upon switching of the system to the
sequence program for the redundant system.
Has a stop error occurred in the CPU module on
the target station or relay station?
Identify the station where the stop error has occurred with the communication test,
and take corrective action. ( Page 47, Section 4.4.4)
Is a unique network number assigned to each
network between the master station and the target
station?
Check the network route between the master station and the target station with the
communication test, and identify the faulty station. ( Page 47, Section 4.4.4)
Are the routing parameter settings correct?
Identify the station where the routing parameter setting is incorrect with the
communication test. ( Page 47, Section 4.4.4)
Check item Check procedure
Is the mode of the remote master station set to
offline?
Set the mode of the remote master station to online and execute the link dedicated
instruction again.
Add SB0043 (Online switch (host)) as an interlock for execution of the link dedicated
instruction so that the instruction is not executed offline.
Are the certain LB/LW areas used only for the link
dedicated instruction?
Check and correct the sequence program or refresh parameter settings so that the
certain LB/LW areas are used only for the link dedicated instruction.