Regarding the order of the address area data in Siemens, please note this
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Regarding the order of data in Siemens address areas, the correct sequence for Siemens address area data is as follows; beginners should pay attention to this: 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 2.7------------2.0 3.7 -----------3.0 _____________DBB0______________ __________DBB1_________________ _______DBB2_______ _______DBB3_______ _______________________________DBW0_______________________________ _________________DBW2________________ _________________________________________________DBD0___________________________________________________ http://bbs.ctrlsky.com/images/NULL.GIF In simple terms, bytes, words, and doubles are arranged from smallest to largest from left to right; within a byte, however, the 8 bits are arranged from largest to smallest from left to right
In this regard, SIEMENS’ PLCs are different from other PLCs, as SIEMENS performs calculations on a byte-by-byte basis.