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5.3.2 Measuring ranges of the analogue inputs
There are seven analogue inputs available only on the base module for any sensors or feedback signals from
actuators that have a current or voltage interface:
For details, see chapter Assignment of the analogue inputs.Allanalogueinputscanbeconfiguredascurrent
(4...20 mA) or voltage inputs (0...10 V), see chapter Configuration of the analogue inputs and outputs.
Examples of field devices for connection to the analogue inputs (e.g. ex works 4..20 mA):
CO
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sensor
Pressure sensor
Brightness sensor
Humidity sensor
Continuous actuators with feedback
Temperature sensor
Flow rate sensor
The values transferred from the controller are raw values of the analogue to digital converter (ADC ), which
must be converted by the CODESYS program into physical values such as temperatures in °C using a linear
characteristic curve.
The current and voltage interfaces use different characteristic curves in the controller. To take this into account,
the setting in the controller configuration must correspond to the field devices used, which is explained in the
following example.
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