Mitsubishi MELSEC LJ71C24, User Manual

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12 DEDICATED INSTRUCTIONS
Function
(1) This function clears reception data in the OS area. It does not clear the user data
reception area in the buffer memory.
(2) If the CSET instruction is executed while the reception data read request (X3/XA)
or reception abnormal detection signal (X4/XB) is turned on, the CSET instruction
is kept waiting until the signal is turned off.
(3) Simultaneous execution of dedicated instructions
The following table shows the handling for when executing another instruction
during execution of the CSET instruction or executing the CSET instruction during
execution of another instruction in the same channel.
Instruction
1
Availability of
simultaneous
execution
Handling of simultaneous execution
ONDEMAND
OUTPUT
PRR
BIDOUT
BIDIN
•
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.)
INPUT (the right column)
[When instructions are executed in order of INPUT CSET]
•
Dedicated instructions simultaneous execution error (7FF0
H
)
occurs in the CSET instruction.
(However, simultaneous execution is available when channels to
be used are not the same.)
[When instructions are executed in order of CSET INPUT]
•
Simultaneous execution is available.
CSET
•
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.)
PUTE
GETE
BUFRCVS
SPBUSY
⎯
UINI
•
Dedicated instructions simultaneous execution error (7FF0
H
)
occurs in the dedicated instruction attempted later.
:
Available
:
Not available
1 The same channel cannot be used for the CPRTCL and CSET instructions
because different communication protocols are used for them.
Using these instructions on the same channel will cause a communication
protocol setting error (7FF2
H
).