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MELSEC-Q
10 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) Simultaneous execution of dedicated instructions
The following table shows the handling for when executing another instruction
during execution of the BIDOUT instruction or executing the BIDOUT instruction
during execution of another instruction in the same channel.
Instruction
1
Availability of
simultaneous
execution
Handling of simultaneous execution
BIDOUT
• The next instruction will be ignored until the active instruction has
been completed.
(However, simultaneous execution is available when channels to
be used are not the same.)
BIDIN
⎯
CSET
• Dedicated instructions simultaneous execution error (7FF0
H)
occurs in the dedicated instruction attempted later.
(However, simultaneous execution is available when channels to
be used are not the same.)
PUTE
GETE
BUFRCVS
SPBUSY
⎯
UINI
• Dedicated instructions simultaneous execution error (7FF0
H)
occurs in the dedicated instruction attempted later.
:
Available : Not available
1 Since the dedicated instructions shown below use a different
communication protocol from that for the BIDOUT instruction, they are not
used in the same channel.
• ONDEMAND, OUTPUT, PRR, INPUT, CPRTCL
If the dedicated instructions shown above are used in the same channel
with the BIDOUT instruction, the communication protocol setting error
(7FF2
H) occurs.
(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.
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