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Technical Reference Manual, General
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The REF 541 and REF 543 feeder terminals equipped with an RTD/analogue
module (RTD1) have eight general purpose analogue inputs for DC measurement.
The RTD/analogue inputs are galvanically isolated from the feeder terminal power
supply and enclosure. However, the inputs share a common ground.
For technical data of the RTD/analogue inputs, refer to Table 4.2.1-4 on page 76.
The parameters for the RTD/analogue inputs are included in the parameter lists on
the CD-ROM “Technical Descriptions of Functions” (refer to section “References”
on page 96).
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The general purpose RTD/analogue inputs accept voltage-, current- or resistance-
type signals. The inputs are configured for a particular type of input signal by means
of the channel-specific “Input mode” parameters that can be found in the menu
Configuration/RTD1/Input # . The default value is “Off” which means
that the channel is not sampled at all, and the IN+, IN- and SHUNT terminals are at
high impedance state.
1) Two-wire measurement
2) Three-wire measurement
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For each measuring mode, a separate parameter is provided for choosing between
the available measurement ranges. These channel-specific parameters, which can be
found in the menu Configuration/RTD1/Input #, are named “Voltage
range”, “Current range”, “Resistance range” and “Temperature range”. All range
parameters can be set but only one is used. The value of the “Input mode” parameter
determines which range parameter is used. The “Temperature range” parameter also
defines the sensor type to be used, e.g. PT100.
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RTD/analogue inputs RTD1_6_AI1
RTD1_6_AI2
RTD1_6_AI3
RTD1_6_AI4
RTD1_6_AI5
RTD1_6_AI6
RTD1_6_AI7
RTD1_6_AI8
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Input mode 0 = Off Off
1 = Voltage
2 = Current
3 = Resistance 2W
1)
4 = Resistance 3W
2)
5 = Temperature 2W
1)
6 = Temperature 3W
2)
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