turck BL67 - Analog Data Representation

Analog input modules
D300529 0115 - BL67 I/O modules6-4
6.1.1 Analog data representation
The analog values can either be represented with 16 or 12 bit. The two's-complement representation
allow the representation of positive as well as negative values. The bits marked with an "X" are not rel-
evant for the analog value representation.
16-bit-representation:
The 16-bit-representation is realized as a two's-complement: 2 byte of process da
ta are completely
occupied:
Figure 6-1:
12-bit-representation (left-justified):
In the voltage measurement/output and in the temperature measurement, the value is represented as
a t
wo's-complement. In the current measurement/output and in the resistance measurement, the
value is represented as a binary number. The 12 bit value is left-justified and occupies bit 15 to 4 of
the process data:
Figure 6-2:
The diagnostic data is integrated in the process input data and occupies 4 bit (right-justified).
NOTE
16-bit-representa-
tion
12-bit-representa-
tion
A detailed description of the measurement value representation for the analog input mod-
ules in 16 or 12 bit can be found in the Appendix of this manual, Analog value representation
(analog input modules) (page 15-8).