Mitsubishi Electric QJ71C24N User Manual page 301

10 DEDICATED INSTRUCTIONS
Function
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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.
(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 lists 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.
Availability of
1
Instruction
simultaneous
execution
BIDOUT
BIDIN
CSET
PUTE
GETE
BUFRCVS
SPBUSY
UINI
1 Because the dedicated instructions listed 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 above are used in the same channel with the
BIDIN instruction, the communication protocol setting error (7FF2
Handling of simultaneous execution
 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.)
 Dedicated instructions simultaneous execution error (7FF0
occurs in the dedicated instruction attempted later.
(However, simultaneous execution is available when channels to
be used are not the same.)
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.)
 Dedicated instructions simultaneous execution error (7FF0
occurs in the dedicated instruction attempted later.
MELSEC-Q



: Available : Not available
) occurs.
H
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)
H
)
H