When The Transmission And Reception Data Are Abnormal; When The Dedicated Link Instruction Is Not Completed - Mitsubishi Electric QJ71LP21 Reference Manual

8 TROUBLESHOOTING

8.2.5 When the transmission and reception data are abnormal

Check item
Is the sequence program correct?
Are the parameter settings of the remote master
station correct?
Check item
Did an error occur while the transient transmission
was being executed?
Response timeout occurs.
Has the transient transmission is executed routing
via the network module of standby system within
the redundant system?
Has a stop error occurred on the route CPU
module or the CPU module of the target station in
the redundant system?
Are the routing parameter settings correct?
Is the network No. parameter correct?

8.2.6 When the dedicated link instruction is not completed

Check item
Is the dedicated link instruction issuing station
online?
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(1) The cyclic transmission data is abnormal
Stop the CPU modules of both the remote master station 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 remote master station's common parameters and refresh
parameters.
Review the range of the link devices assigned to the sending station.
Check the setting of the network refresh 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.
(2) The transient transmission is abnormal
Check the error code at the transient transmission execution and correct the error
according to the error code table in Section 8.3.
Confirm the message screen of GX Developer and the error code of the response
packet of the dedicated instruction/MELSEC communication protocol, and take
measures based on the error code table in section 8.3.
Confirm if transient transmission is executed for ACPU, QnACPU, or QCPU (except for
QnPRHCPU) by specifying the control system or standby system (error code 4B00).
Confirm if transient transmission is executed for a single CPU system by specifying a
CPU No. of a multiple CPU system (error code 4B00).
Confirm if a value out of the available range is set up for the CPU type of the target
station.
Change the routing settings to the network module of control system.
Clear the stop error on the route CPU module or CPU module of the target station.
Change the route station No. or the station No. of the target station.
Check the routing parameters with the communication test of GX Developer's online
diagnostics.
Check the network No. parameter.
If the parameter is not set, the network No. has been set to 1 (default); so check other
station's network No..
Place the dedicated link instruction issuing station online and execute the dedicated link
instruction.
Use SB43 as an interlock to confirm the online status in the sequence program.
Checking procedure
Checking procedure
Checking procedure
MELSEC-Q
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