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BC, data block comparator
189
02/16 MN05013001Z EN
Specifying the marker range
Marker ranges can be specified with or without an offset.
Marker range without offset
If MB, MW or MD markers are specified at both >I1 and >I1
the number of the markers is the start of comparison range.
Marker range with offset
If you wish to work with an offset, specify one of the
following variables at function block input >I1 or >I2:
• Constant.
• Output ..QV> of a function block.
The value at the input is taken as the offset to marker byte
MB01.
Example: A value of 0 at I1 means that the reference data
block for the comparison begins at MB01. A value of 100 at
I2 means that the target data block for the compare
operation begins at MB101.
Offset calculation for addressing marker words:
Offset = MW (x - 1)
x
2
Offset calculation for addressing marker double words:
Offset = MD (x - 1)
x
4
h
With the offset information you can address marker
ranges (for example MB380), which you can not address
when using marker operands (direct addressing).
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