II - DCE FEL ČVUT v Praze

Temperature range
type S
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
Table 3-18 shows the representation of the digitized measured value for the
temperature range, sensor type S.
Table 3-18 Representation of the digitized measured value of an analog input
module (temperature range, type S)
Temperature
range in C
Decimal Hexadecimal Range
> 1850.0 32767 7FFFH Overflow
1850.0
:
1769.1
1769.0
:
:
-50.0
-50.1
:
-170.0
18500
:
17691
17690
:
:
-500
-501
:
-1700
4844H
:
451BH
451AH
:
:
FE0CH
FE0BH
:
F95CH
SIMATIC S7 Ex Analog Modules
Overrange 1)
Rated range
Underrange 1)
< -170.0 -32768 8000H Underflow
In the case of incorrect wiring (e.g. polarity reversal, open inputs) or a sensor fault in
the negative range (e.g. incorrect type of thermocouple), ondropping below F95CH the
analog input module signals underflow and outputs 8000H.
1) The characteristic of the thermocouple is not defined in the overrange and
underrange. The rise of the characteristic curve is retained on leaving the linearized
range. It is not possible to specify the accuracy of these ranges.
3-19