Measured Value (Signed Integer) - Siemens SIPROTEC 7SA522 Manual

3.4

Measured value (signed integer)

Number of
byte-values
Range of values
Message head ...
Figure 3-4 Data type: Measured value (signed integer)
Status bit (S)
SIPROTEC PROFIBUS-DP - Communication profile
C53000-L1840-B001-03
2
-32768 to +32767
(-32768 = 8000 = "Overflow" or "Invalid")
hex
S
Byte 1 (MSB)
• Sign bit, active if negative measured value
Negative measured values are transmitted in the two's complement, i.e:
-1 = FFFF , -2 = FFFE
hex
• Status bit = 1 and measured value = 0
(i.e. transmission of the value 8000
Measured value overflow or invalid measured value.
Note:
The value -32768 for signalling of "Overflow" or "Invalid" is only used for measured
values in input direction.
If an evaluation of the status of a measured value in output direction is required in the
SIPROTEC device then a separate position in the PROFIBUS-DP message is to be
used for this.
Measured value
Byte 0 (LSB)
, ..., -32767 = 8001
hex
= -32768):
hex
Data type definitions
... Message end
hex
49