Mitsubishi Electric QJ71E71-100 User Manual page 266

• Completion of the BUFRCV instruction can be checked with Completion device (D2)+0 and (D2)+1.
• Completion device
(D2)+0:
• Completion device
(D2)+1:
[Operation while the BUFRCV instruction is being executed]
Program
BUFRCV instruction
Completion device
Completion device + 1
• The ZP.BUFRCV instruction is executed on the rising edge (OFF ON) of the read command (bit for a
connection with the connected device set in Fixed buffer reception status signal (address: 5005
● Do not perform a receive process using I/O signals and using the dedicated instruction together for the same connection.
Doing so will result in malfunction.
● When receive data is read from the same connection, the BUFRCVS instruction (for an interrupt program) cannot be
used together.
(5) Errors
• If a dedicated instruction ends with an error, Completion device (D2)+1 turns on, and the error code is stored
in Completion status (S2)+1.
264
Turns on at the END process of the scan where the BUFRCV instruction is
completed and turns off at the next END process.
Turns on and off depending on the completion status of the BUFRCV
instruction.
• Normal completion:
• Abnormal end:
END
Scan
process
Executed
Receiving data
Storing the receive data
Stays off and does not change.
Turns on at the END process of the scan where
the BUFRCV instruction is completed and turns off
at the next END process.
END
Scan Scan
process
Abnormally ended
END
process
)).
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