Table 50: Limits for the RTD/mA inputs
Input mode Description
Not in use Default selection. Used when the corresponding input is not used.
0...20 mA Selection for analog DC milli-ampere current inputs in the input range of 0 – 20 mA.
Resistance Selection for RTD inputs in the input range of 0 – 2000 Ω.
Pt100
Pt250
Ni100
Ni120
Ni250
Cu10
Selection for RTD inputs, when temperature sensor is used. All the selectable
sensor types have their resistance vs. temperature characteristics stored in the
module; default measuring range is -40 – 200 °C.
3.11.2.2 Selection of output value format
Each input has independent Value unit settings that are used to select the unit for
the channel output. The default value for the Value unit setting is “Dimensionless”.
Input minimum and Input maximum, and Value maximum and Value minimum
settings have to be adjusted according to the input channel. The default values for
these settings are set to their maximum and minimum setting values.
When the channel is used for temperature sensor type, set the Value unit setting to
“Degrees celsius”. When Value unit is set to “Degrees celsius”, the linear scaling is
not possible, but the default range (-40…200 °C) can be set smaller with the Value
maximum and Value minimum settings.
When the channel is used for DC milli-ampere signal and the application requires
linear scaling of the input range, set the Value unit setting to “Dimensionless”,
where the input range can be linearly scaled with settings Input minimum and Input
maximum to Value minimum and Value maximum. When milli-ampere is used as an
output unit, set the Value unit setting to “Ampere”. When Value unit is set to
“Ampere”, the linear scaling is not possible, but the default range (0…20 mA) can
be set smaller with Value maximum and Value minimum settings.
When the channel is used for resistance type signals and the application requires
linear scaling of the input range, set the Value unit setting to “Dimensionless”,
where the input range can be linearly scaled with the setting Input minimum and
Input maximum to Value minimum and Value maximum. When resistance is used as
an output unit, set the Value unit setting to “Ohm”. When Value unit is set to
“Ohm”, the linear scaling is not possible, but the default range (0…2000 Ω) can be
set smaller with the Value maximum and Value minimum settings.
3.11.2.3 Input linear scaling
Each RTD/mA input can be scaled linearly by the construction of a linear output
function in respect to the input. The curve consists of two points, where the y-axis
(Input minimum and Input maximum) defines the input range and the x-axis (Value
minimum and Value maximum) is the range of the scaled value of the input.
1YHT530004D05 D Section 3
Basic functions
615 series 87
Technical Manual
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