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MELSEC-Q
10 DEDICATED INSTRUCTIONS
1 When setting "Word/byte units designation" by GX Configurator-SC, set the
number of bytes when bytes are designated and set the number of words when
words are designated as the unit types.
2 The settings are done by either of the following:
• User : Data set by the user before executing the BIDIN instructions.
• System : The programmable controller CPU stores the execution result of the
BIDIN instructions.
Function
(1) The function stores in the device designated in (D1) and succeeding devices the data
received via the bidirectional protocol of the module designated
in Un, according to
the control data of the device designated
in (S) and succeeding devices.
(2) Simultaneous execution of dedicated instructions
The following table shows the handling for when executing another instruction
during execution of the BIDIN instruction or executing the BIDIN instruction during
execution of another instruction in the same channel.
Instruction
1
Availability of
simultaneous
execution
Handling of simultaneous execution
BIDOUT
⎯
BIDIN
• 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.)
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
BIDIN instruction and BUFRCVS instruction cannot be used at the
same time.
(However, simultaneous execution is available when channels to be
used are not the same.)
SPBUSY
⎯
UINI
• Dedicated instructions simultaneous execution error (7FF0H)
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 BIDIN 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 BIDIN instruction, the communication protocol setting error
(7FF2
H) occurs.
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