3.13.2.3 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.
The input scaling can be bypassed by selecting Value unit = "Ohm" when
Input mode = "Resistance" is used and by selecting Value unit = "Ampere"
when Input mode = "0...20 mA" is used.
Example for linear scaling
Milliampere input is used as tap changer position information. The sensor information is
from 4 mA to 20 mA that is equivalent to the tap changer position from -36 to 36,
respectively.
Input maximum
Input minimum
Input mode
”0..20mA”
4 mA
20 mA
Value minimum
-36
AI_VAL#
Value maximum
36
Value unit
”Dimensionless”
X130-Input#
GUID-85338A5E-3D2F-4031-A598-EA8A525190D3 V1 EN
Figure 30: Milliampere input scaled to tap changer position information
3.13.2.4 Measurement chain supervision
Each input contains a functionality to monitor the input measurement chain. The circuitry
monitors the RTD channels continuously and reports a circuitry break of any enabled
input channel. If the measured input value is outside the limits, minimum/maximum value
is shown in the corresponding output. The quality of the corresponding output is set
accordingly to indicate misbehavior in the RTD/mA input.
Section 3 1MAC059074-MB A
Basic functions
116 615 series ANSI
Technical Manual
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