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Reference Data
A-8
SIMATIC 505 PROFIBUS-FMS CP User Manual
A.3 Mapping of FMS Variables onto 505 Memory
Figure
A-2
shows examples of how simple variables are mapped in
SIMA
TIC 505 V
-memory.
12345678910111213141516
*******
X
*
Boolean
A
Boolean is rounded up to an even byte length, but the extra bits are not transferred.
12345678910111213141516
X
Integer16
12345678910111213141516
X
Integer32
12345678910111213141516
X
*
Unsigned8
An Unsigned8 is rounded up to an even length, but the extra byte is not transferred.
12345678910111213141516
X
Unsigned16
12345678910111213141516
X
Unsigned32
12345678910111213141516
X
Octet String5
An
odd-length Octet String is treated as the next larger even-length Octet String.
X
XX
XX
12345678910111213141516
X
Bit String3
An
odd-length Bit String is treated as the next larger even-length Bit String.
X
XX
Note:
*
represents bits or bytes skipped for alignment purposes. When the variable is read,
this data is not transmitted; when the variable is written, this data is written to the value 0.
X represents data values.
12345678910111213141516
X
Floating Point
Figur
e A-2
Mapping
of Simple V
ariables in 505 Memory
Simple V
ariables
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