Siemens SIMATIC S7-200 Driver Manual - Page 23
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Siemens S7-200 Driver
23
When modifying Word, Short, DWord, Long and Float types remember that each address starts at a byte
offset within the device. Therefore, Words V0 and V1 overlap at byte 1. Writing to V0 modifies the value held
in V1. Similarly, DWord, Long, and Float types can also overlap. It is recommended that these memory types
be used so that overlapping does not occur. For example, when using DWords, use V0, V4, V8 ... and so on, to
prevent overlapping bytes.
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