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MELSEC-Q
9 DEDICATED INSTRUCTIONS
Function
(1) The function sends data stored in the device designated in (S2) and succeeding
devices according to the control data of the device designated in (S1) and
succeeding devices, via the bidirectional protocol of the module designated in Un.
(2) When a BIDOUT instruction is executed on a channel, other BIDOUT instructions
cannot be executed on that channel at the same time.
If an attempt is made during execution of a BIDOUT instruction to execute another
BIDOUT instruction, the second instruction will not be executed until the execution
of the first instruction is completed.
(3) Whether a BIDOUT instruction was completed normally or abnormally can be
checked by the completion device ((D)) or status display device at completion
((D)+1).
(a) Completion device: Turns on at the END processing of the scan where the
BIDOUT instruction is completed, and turns off at the next
END processing.
(b) Status display device
at completion
: Turns on and off depending on the completion status
of the BIDOUT instruction.
• Normal completion : Off with no change.
• Abnormal completion: Turns on at the END
processing of the scan where
the BIDOUT instruction is
completed, and turns off at
the next END processing.
[Operation during execution of a BIDOUT instruction]
BIDOUT instruction
Execution of BIDOUT
instruction
Completion of transmission by
a BIDOUT
ON
ON
OFF
OFF
END
processing
END
processing
END
processing
END
processing
Sequence
program
Completion device
Status display device
at completion
Abnormal
completion
Normal
completion
One scan
Error
(1) When a dedicated instruction is completed abnormally, the abnormal completion
signal (D)+1, turns on and the error code is stored in the transmission result (S1)+1.
In case of operation errors, the error flag (SM0) turns on and the error code is
stored in SD0.
See one of the following manuals according to the error code, and check and
correct the error.
<Error code>
4FFF
H
or less : QCPU(Q Mode) User's Manual
(Hardware Design, Maintenance and Inspection)
7000
H
or more: Section 10.2 of the User's Manual (Basic)