Input Mode - ABB RELION REX640 Technical Manual

Section 3
Basic functions
3.15.3.1
160
All the channels are independent mA/RTD channels with separated protection,
filtering, reference, A/D-conversion and isolation. Thus, the RTD group is isolated
from mA channels.
The RTD inputs measure resistance in the range of 0...4000 Ω. All inputs are
calibrated and the calibration factors are stored on the module in nonvolatile memory.
The calibration circuitry monitors the RTD channels continuously and reports the
circuitry break of any channel.
The RTD inputs have separate setting values for value update interval. The settings
are: "No delay", "10 ms delay", "50 ms delay" and "100 ms delay". Between the update
intervals the RTD input constantly returns the last valid value before updating to the
new value after the interval time expires.

Input mode

Table 81: Analog input modes for the mA inputs 1 and 2
Input mode Description
Not in use Default selection when the corresponding input is not used
-20...20mA The analog input covers the range of -20...20 mA.
The input can be used in a narrower range by setting
Input maximum . Settings Value minimum and Value maximum are used to
scale the output within the appropriate range. The output unit is selected with
the set
Table 82: Analog input modes for the RTD inputs 1...10
Input mode Description
Not in use Default selection when the corresponding input is not used
Resistance Freely settable resistance input
Input minimum and Input maximum define the resistive input range. The
corresponding output can be scaled based on
maximum . The output unit is selected with the set Value unit .
Pt 100 The input is expected to be the selected temperature sensor. The set
unit should be set to degrees Celsius. The expected input range is
Pt 250
-40...200°C. However, the output can be scaled to a narrower output range by
setting
Ni 100
Ni 120
Ni 250
The function has a built-in functionality for the resistance inputs. It monitors all the
enabled inputs and detects if the sensor is removed from the input. If the sensor is
removed when the input is enabled, a warning indication is displayed, SENSOR_FLT
is activated and quality is set accordingly.
Selection of value unit format
Each input has an independent Value unit setting that is used to select the unit for the
channel value representation. The default value for the Value unit setting is
Value unit .
Value minimum and Value maximum .
1MRS759142 C
Input minimum and
Value minimum and Value
Value
REX640
Technical Manual