Section 3
1MAC050144-MB C
Basic functions
72
615 series ANSI
Technical Manual
3.10.2
Operation principle
All the inputs of the module are independent RTD and mA channels with individual
protection, reference and optical isolation for each input, making them galvanically
isolated from each other and from the rest of the module. However, the RTD inputs share
a common ground.
3.10.3
Selection of input signal type
The function module inputs accept current or resistance type signals. The inputs are
configured for a particular type of input type by the channel specific
Input mode
setting.
The default value for all inputs is “Not in use”, which means that the channel is not
sampled at all, and the output value quality is set accordingly.
Table 45:
RTD/mA settings
3.10.4
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
respective,
Input maximum
and
Value maximum
respective,
Value minimum
settings have to be adjusted according to the input channel. The default values for these
settings are set to their maximum respective 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
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.
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