Microtronics 305001, User Manual

Page: 31 / 127

Chapter 6 Functional principle
6.1.4 Scale module
This module rescales the raw value (e.g. mA) to the required measurement value (e.g. mm). The
number of edges that have been added up from the counter module is used for the "Cnt.Day" and
"Cnt.Intervl." channel modes instead of the output value of the overflow module.
For "Cnt.Intervl." channel mode, the raw value is converted into the measurement value by
multiplying the number of edges that have been added up by the pulse value determined by the
"Impulse" parameter. The meter reading of the counter module is then reset.
For "Cnt.Day" channel mode, the raw value is also converted into the measurement value by
multiplying the number of edges by the pulse value determined by the "Impulse" parameter.
However, in this mode the meter reading of the counter module is not reset at the time of every
measurement but is instead reset at the time specified via the "Day change over" parameter (see
"Additional explanation regarding the difference between "Cnt.Day" and "Cnt.Intervl."" on page
72). A more detailed description on generating measurement values at the day changing time are
provided in "Day change" on page 34.
The following table specifies the relevant parameters for the module:
Configuration section Mode Parameter Explanation
Measurement channels ->
Basis Digital Invert Inverts the input signal
Cnt.Day Impulse Counted measurand of a pulse in the
measurement unit
Cnt.Intervl.
4-20mA
0-20mA
0% Start of the measurement range in the
measurement unit
100% End of the measurement range in the
measurement unit
Measurement channels -
>Config. Digital High level 0: The levels are set automatically.
> 0mV: Level from which the signal at the
universal input is interpreted as "high".
"low" is detected at the "high level" -
10%.
Cnt.Day
Cnt.Intervl.
Basic settings Cnt.Day Day change
over Reset time of the day counter
6.1.5 Trim/sensor offset module
The installation height of the sensor can be taken into consideration with the help of this module. It
also enables the zero point to be adjusted without having to change the value for the installation
height again. The trim/sensor offset module is only available for analogue modes ("0...20mA",
"4...20mA"). The "Trim" parameter value and the "Sensor offset" parameter value are added to the
output value of the scale module (see "Scale module" on page 31). This means that a negative
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