11 - 5 11 - 5
MELSEC-Q
11 TROUBLESHOOTING
(3) Troubleshooting for other symptoms
No.
Symptom
Check Item
Corrective Action
Reference
Section
Check if the dedicated instruction is
active.
Start the dedicated instruction.
Check whether the programmable
controller CPU is in the RUN status or
not.
RUN the programmable controller CPU.
While the dedicated instruction is
executed, the related starting contact
was turned on. (When a starting contact
is turned on with the related dedicated
instruction being executed, the start
instruction is ignored.)
Retry after the dedicated instruction is
completed.
Check whether more than the
executable dedicated instructions (8
instructions) were started.
Retry after the dedicated instructions
being executed are completed.
Chapter 10
Check whether the dedicated instruction
failed or not.
Refer to "Dedicated instruction failed.".
This section
(3)-2
1 Dedicated
instruction is not
executed.
(Complete device
(D2) does not turn
on.)
Check whether the module is waiting for
a response from the target device with
the dedicated instruction already being
executed.
• Wait for the response monitoring timer
to expire.
• Check the target device status.
• If an error occurs, refer to "Dedicated
instruction failed.".
Section 7.2
This section
(3)-2
Check if the INIT. LED is on.
Refer to "INIT. LED does not turn on.".
This section
(1)-4
Confirm the error code or exception
code stored in the control data of the
dedicated instruction.
Take the corresponding corrective action
and retry.
Chapter 10
Section 11.3
<MBRW instruction>
Change the device type of the control
data so that the function code supported
by the target device is issued.
Section 10.2
Check whether the target device
supports the corresponding function
code.
<MBREQ instruction>
Change the send data so that the
function code supported by the target
device is issued.
Section 10.3
When the MBREQ dedicated instruction
is used, check the created request
message.
Correct the request message and retry.
Chapter 4
Section 10.3
2 Dedicated
instruction failed.
Refer to "Communication with target device cannot be made if each parameter
setting is completed.".
This section
(3)-6
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