ABB REF 54 Series Technical Reference Manual page 55

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Technical Reference Manual, General
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The REF541 and REF543 feeder terminals equipped with an RTD/analogue module
have four general purpose 0...20 mA analogue current outputs. All outputs are
galvanically isolated from the supply and enclosure of the feeder terminal and from
each other.
For technical data of the analogue outputs, refer to Table 4.2.1-7 on page 76.
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Analogue outputs RTD1_6_AO1
RTD1_6_AO2
RTD1_6_AO3
RTD1_6_AO4
The parameters and events for the analogue outputs are included in the event and
parameter lists on the CD-ROM "Technical Descriptions of Functions" (refer to
section "References" on page 96).
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The outputs can be set to two different current ranges with the "Output range"
parameters in the menu Configuration/RTD1/Output # .
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Output range 0 = 0...20 mA
1 = 4...20 mA
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The status (value) and the validity of the output can be issued for each analogue
output by the attributes AO# (REAL type) and AO#IV (BOOL type), where #
denotes the number of the output. These attributes are available in the feeder
terminal configuration and can be used for different purposes.
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The value written to AO# is transferred to a current signal at the output. The output
response time is ≤85 ms, consisting of the software delay and the rise time of the
analogue output, counted from the moment when the value attribute is updated in the
configuration program.
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The AO#IV attribute represents the invalidity status of the output. The attribute is
set to FALSE when the value (AO#) is valid, i.e. an equal amount of current is
flowing through the output, and to TRUE when the value is invalid, i.e. the current
at the output is different from the value of AO#. When the AO#IV attribute is TRUE,
this indicates one of two situations: either the current loop connected to the output
is broken or the value attribute is written with a value outside the range defined by
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0...20 mA
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