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2.2.2
Scaling of measured values
Introduction
The measured value scaling can be combined with the measuring range adjustment. In this
case, the measuring range is adjusted first and then the representation of the measuring
range is scaled.
Function
With measured value scaling, the user data of the module is displayed in REAL format (32-
bit floating point) instead of S7 format.
The representation of the measuring range is defined by the following parameters:
● The "Scaled high nominal range limit" parameter sets the desired display value (in REAL
format) for the high nominal range limit of the measuring range.
● The "Scaled low nominal range limit" parameter sets the desired display value (in REAL
format) for the low nominal range limit of the measuring range.
Note
Effects of inversion
•
"Scaled low nominal range limit" parameter, whereby the representation of the measuring
range will be inverted compared to the terminal value (V, mA).
•
REAL format. A terminal value of > 11.76 V triggered an underflow for an inverted
measured value scaling. Hardware interrupts react similarly.
Substitute value for underflow/overflow
With measured value scaling, the substitute value is minus infinity for underflow (FF80
0000H) and plus infinity for overflow (7F80 0000H).
Resolution at the parameter "Scaled high/low nominal range limit"
When the Parameter "Scaled high nominal range limit" and "Scaled low nominal range limit"
parameters are too close together, resolution may be lost, which means it may no longer be
possible to show every value.
Analog Input Module AI 8xU/I HF (6ES7531-7NF00-0AB0)
Manual, 09/2016, A5E36649087-AB
It is possible to set the "Scaled high nominal range limit" parameter lower than the
Overflow/underflow and hardware interrupts are always based on representation in
Product overview
2.2 Functions
17
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