Mitsubishi Electric MELSEC Q Series User Manual page 454

8 DEDICATED INSTRUCTION
Function
[Operation at execution of WFDEL instruction]
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1 The setting side is as follows.
• User : Data are set by the user before execution of the dedicated instruction.
• System : The execution result of the dedicated instruction is stored by the
programmable controller CPU.
2 Refer to Section 9.3 for the error code.
(1) The user data file of the CompactFlash card is deleted.
(2) Executing the same instruction during execution of the instruction is not allowed.
(The second instruction will not be processed.)
In this case, even if an error is detected, the completion device ((D) + 0) and
completion status indication flag ((D) + 1) do not turn on.
(3) An error may occur if the same file is concurrently accessed by WFDEL and any
other instruction (WMSEND, FTPPUT, FTPGET, WFWRITE, WFREAD).
Before executing instructions, provide interlocks between the dedicated
instructions that will access the same file.
(4) This instruction is not available for interrupt programs.
(5) As the user data file, a file in the "/CF/USER/" directory of the CompactFlash card
can be specified.
(6) The execution and normal/abnormal completion statuses of the WFDEL
instruction can be confirmed using the completion device ((D) + 0) and
completion status indication flag ((D) + 1).
(a) Completion device ((D) + 0)
This device turns on in the END processing of the scan for which the WFDEL
instruction is completed, and turns off in the next END processing.
(b) Completion status indication flag ((D) + 1)
This device turns on/off according to the completion status of the WFDEL
instruction.
Normally completed : Remains off.
Abnormally completed: Turns on in the END processing of the scan where
When the WFDEL instruction is completed, the completion device (bit device) set in
((D) + 0) turns on in the END processing of the completed scan, and turns off in the
next END processing.
When an error occurs, the completion device set in ((D) + 1) turns on and an error
code is stored into the completion status (word device) set in ((S) + 1).
Sequence program
WFDEL instruction
Completion device
Completion device +1
the WFDEL instruction is completed, and turns off
in the next END processing.
END
Scan Scan
processing
Instruction execution
OFF
OFF
File deletion
MELSEC-Q
END END
Scan
processing processing
ON
ON
When abnormally completed
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