2 PROFINET IO in SIPROTEC
2.8 Acyclic Reading and Writing of Data
48 SIPROTEC 4, Communication Module PROFINET IO, Communication Profile
C53000-L1840-C360-1, Edition 08.2012
2.8.3 Reading Conversion Factors of Metered Values
An acyclic read telegram is defined for reading conversion factors. The order of the values in the telegram
corresponds to the order of the values in the IO module.
Multiplication of the metered value with the conversion factor either yields the associated energy value (for
metered values derived from measured values) or the value in the measured unit (for pulse metered values via
binary inputs).
Figure 2-24 Acyclic Data Telegram, Reading Conversion Factors of Metered Values
Number of Values
• IO module for metered values: 4
Conversion Factor #1 through Conversion Factor #n
The telegram always only contains as many conversion factors as entered in the byte Number of values. This
also determines the length of the telegram.
Number of values
Conversion factor #1
(Float32)
Conversion factor #n
(Float32)
Byte offset = 0
Start offset = 2
Start offset = 6
Start offset = (n * 4) - 2
Max. end offset = (n * 4) + 1
...
Reserved = 0
Byte offset = 1
com_profinet-io_profile_us.book Page 48 Friday, August 17, 2012 1:40 PM
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