22.11.2.2 Compare Memory
Compares two blocks of data at the specified
positions (offset), and writes the comparison result to the storage
address.
The following values are stored as the comparison result: When the
values are equal: When the target data is larger than the original
data: When the target data is smaller than the original data: When
an error occurs, the error status value is written to LS9152.
_memcmp ([Compared block Address], [Compare
to Block Address], [Comparison Result Storage Address], Offset from
Start of Block, Number of Compared Words, Words in 1 Block)
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Parameter 1: Internal Device
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Parameter 2: Internal Device
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Parameter 3: Internal Device
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Parameter 4: Numeric Value (0 to 639), Internal
Device, Temporary variable
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Parameter 5: Numeric Value (1 to 640)
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Parameter 6: Numeric Value (1 to 640)
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Stored Data
0: same
1: Compare < Compare to
2: Compare > Compare to
Example expression 1:
_memcmp ([w:[#INTERNAL]LS1000],
[w:[#INTERNAL]LS1005], [w:[#INTERNAL]LS0100], 0, 1, 5)
Since the source value is smaller than the target value, the
comparison result "2" is stored in LS0100.
Example expression 2:
_memcmp ([w:[#INTERNAL]LS1000],
[w:[#INTERNAL]LS1010], [w:[#INTERNAL]LS0100], 2, 3, 5)
Since the values of the original and target data match, the
comparison result "0" is stored in LS0100.
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Editor Function Name
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LS Area
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Error Status
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Cause
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_memcmp ( )
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LS9152
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0000h
|
Completed Successfully
|
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0001h
|
Parameter error
|
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0003h
|
Write/Read error
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The effective LS address range that can be
specified is limited to the designated user area (LS20 to LS2031
and LS2096 to LS8191).
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When you specify a value that is larger than
the number of words in one block to the offset of a block, this
feature does not work.
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When the number of words to compare is
larger than one block, this feature does not work.
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