Mitsubishi Melsec-L Series User Manual page 169

• Completion of the BUFSND instruction can be checked with Completion device (D1)+0 and (D1)+1.
Item
Completion device
(D1)+0:
Completion device
(D1)+1:
[Operation while the BUFSND instruction is being executed]
Program
BUFSND instruction
Completion device
Completion device + 1
• The ZP.BUFSND instruction is executed on the rising edge (OFF ON) of the sending command.
Do not perform a send process using I/O signals and using the dedicated instruction together for the same connection.
Doing so will result in malfunction.
(5) Errors
• If a dedicated instruction ends with an error, Completion device (D1)+1 turns on, and the error code is stored
in Completion status (S2)+1.
Turns on at the END process of the scan where the BUFSND instruction is completed and
turns off at the next END process.
Turns on and off depending on the completion status of the BUFSND instruction.
Normal completion: Stays off and does not change.
Abnormal end: Turns on at the END process of the scan where the BUFSND instruction is
completed and turns off at the next END process.
END
Scan Scan
process
Executed
Sending data
CHAPTER 13 DEDICATED INSTRUCTIONS
Description
END END
Scan
process process
Abnormally ended
13
167