turck BL67 - Analog Value Representation (Analog Input Modules)

Appendix
D300529 0115 - BL67 I/O modules15-8
15.2 Analog value representation (analog input modules)
The analog values can either be represented with 16 bit or 12 bit. The two's-complement representa-
tion allow the representation of positive as well as negative values.
16 bit representation:
The 16-bit-representation is realized as a two's-complement: 2 byte of process da
ta are completely
occupied:
Figure 15-1:
12 bit representation:
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 dual number. The 12 bit value is left-justified and occupies bit 15 to 4 of the
process data:
Figure 15-2:
The diagnostic data is integrated in the process input data and occupies 4 bit (right-justified).
16 bit representa-
tion
12 bit representa-
tion