Number Representation Depending On The Parameterization - Siemens SIPROTEC 4 Manual

3.2

Number representation depending on the parameterization

To specify the scaling of a measured value, the number format (number of the relevant fractional digits) of the
measured value in the SIPROTEC 4 device must be known as well as the unit to which it refers.
Percentage value
A scaling factor of 100 is recommended for percentage values.
With that, the Measured value(Integer) in the Modbus TCP message has to be interpreted as:
± 32767 corresponds to ± 327.67 %
Secondary value
The transmission of a measured value as secondary value is meaningful only in few cases (e.g. transducer
measured values in mA).
The number of significant fractional digits depends on the installation and transducer data.
Primary value
The number of relevant fractional digits and the respective unit for primary values depends tightly on the
parameterized nominal values of the primary equipment (see DIGSI 4, Power system data 1 and Power
system data 2).
SIPROTEC 4, Modbus TCP Profile, Manual
C53000-L1840-C582-1, Edition 07.2015
3.2 Number representation depending on the parameterization
Scaling of Measured Values
43