Mitsubishi MELSEC-Q Series User Manual page 420
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Also See for MELSEC-Q Series:
- Programming manual (1296 pages) ,
- User manual (814 pages) ,
- Reference manual (532 pages)
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8 DEDICATED INSTRUCTION
Read data
Device
Item
(D1) + 0
Read data
to
(D1) + n
Function
Precaution
8 - 32
The read data are stored.
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 Compact Flash
programmable controller CPU in binary or CSV format.
(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 ((D2) + 0) and
completion status indication flag ((D2) + 1) do not turn on.
(3)
An error may occur if the same file is concurrently accessed by WFREAD and
any other instruction (WMSEND, FTPPUT, FTPGET, WFWRITE, WFDEL).
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 Compact Flash
card can be specified.
(6)
The execution and normal/abnormal completion statuses of the WFREAD
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
WFREAD 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 WFREAD
instruction.
Normally completed : Remains off.
Abnormally completed: Turns on in the END processing of the scan where
(1)
The data read at the CSV setting are decimal values.
When word is specified: -32768 to 32767, 0 to 65535
When byte is specified: -128 to 127, 0 to 255
Any value outside the above range (including characters other than numeric
characters) is converted into 0.
Setting data
TM
card are read to the device data of the
the WFREAD instruction is completed, and turns
off in the next END processing.
MELSEC-Q
Setting
Setting side
range
( 1)
System
TM
8 - 32
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