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MELSEC-Q
8 TROUBLESHOOTING
(2) The transient transmission is not normal
Check item Checking procedure
Did an error occur while the transient transmission was
being executed?
Check the error code at the transient transmission execution and correct the
error according to the error code table in Section 8.3.
Confirm whether a dedicated link instruction is executed to a programmable
controller CPU other than the redundant CPU with the control or standby
system specified. (Error code: 4B00
H
)
Check if a dedicated link instruction is executed for a CPU other than the
QCPU in the multiple CPU No. specification. (Error code: 4100
H
, 4B00
H
,
FE20
H
)
Confirm whether a dedicated link instruction is executed to a single CPU
system with a multiple CPU number specified. (Error code: 4B00
H
)
Check if a non-existing multiple CPU No. is specified in the target station
type. (Error code: 4B00
H
)
Are the routing parameter settings correct?
Check that the communication target is not set for a station on another
network No. If it is set for a station on another network No., correct the set
value of the routing parameter. (Refer to Section 7.4.2.)
Check the routing parameters with the communication test of GX Developer's
network diagnostics.
Is the network No. parameter correct?
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..
A dedicated link instruction is not responded within specified
time.
Confirm whether a value out of the set range is set for the target station CPU
type.
Does the transmission go through the network module on
the standby system in the redundant system?
Using the RTWRITE instruction, change the routing parameter so that
transmission will go through the network module on the control system.
The dedicated link instruction executed in the multiple CPU
No. specification does not access the target CPU.
<When the dedicated link instruction is started from the QnACPU>
Not executable for the QnACPU.
<When the dedicated link instruction is started from the QCPU>
Check whether the QCPUs and network modules of the host station and
target station are the following versions.
QCPU: Serial number (first five digits) "06092" or later
Network module: Serial number (first five digits) "06092" or later
Check if the group or all stations has been specified for the target station
number. (Refer to Section 2.2.2 (5).)
Is the number of resends set every time the instruction is
executed?
Confirm whether a program requires the setting of the number of resends
when executing instructions.
8.2.10 Link dedicated instruction not complete
Check item Checking procedure
Is the link dedicated instruction issuing station online?
Place the link dedicated instruction issuing station online and execute the link
dedicated instruction.
Use SB0043 as an interlock to confirm the online status in the sequence
program.
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