Analog Outputs; 1.Selection Of Analog Output Range; 2.Attributes Of An Analog Output For Transformer; Terminal Configuration - ABB RET 54 Series Technical Reference Manual, General

RET 54_
5.1.10.
5.1.10.1.
5.1.10.2.
62
Transformer Terminal
Technical Reference Manual, General

Analog outputs

The RET541 and RET543 transformer terminals equipped with an RTD/analog
module have four general purpose 0...20 mA analog current outputs. All outputs are
galvanically isolated from the supply and enclosure of the transformer terminal and
from each other.
For technical data of the analog outputs, refer to Table 5.2.1-7 on page 91.
RET541/RET543 + RTD1
Analog outputs
The parameters and events for the analog outputs are included in the event and
parameter lists on the CD-ROM "Technical Descriptions of Functions" (refer to
"Related documents" on page 9).
Selection of analog output range
The outputs can be set to two different current ranges with the "Output range"
parameters in the menu Configuration/RTD1/Output #.
Parameter Values
Output range 0 = 0...20 mA
1 = 4...20 mA
Attributes of an analog output for transformer terminal
configuration
The value and the validity of the output can be issued for each analog 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 transformer terminal configuration
and can be used for different purposes.
Value (AO#)
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
analog output, counted from the moment when the value attribute is updated in the
configuration program.
Invalidity (AO#IV)
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
RTD1_6_AO1
RTD1_6_AO2
RTD1_6_AO3
RTD1_6_AO4
Default
0...20 mA
1MRS755225