5.4.2 Pt1000 sensor inputs
The process images of the Pt1000 sensor inputs (for details, see chapter Assignment of the analogue inputs)
provide a signed 16-bit integer value that is a factor of 10 higher than the measured temperature value in °C.
For further use, this value is usually divided by 10 and assigned to a REAL variable.
The following table shows the connections:
Measured value Value in the process image Meaning
< -50 °C
16#8080
1)
Sensor fault
-50°C -500
0°C 0
0.1°C 1
1.6°C 16
50°C 500
200°C 2000
> 200 °C
16#8080
1)
Sensor fault
1)
16#8080=32896
The 16-bit value range is: -32768 .. 32767. Therefore, in the Signal List for the Pt1000 sensor inputs,
e.g. for the sensor Pt1000_1, the value II26 and not IW26 is entered in order to record the negative
number range.
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