ABB REM 54 Series, Technical Reference Manual

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1MRS750915-MUM
REM 54_
65
Machine Terminal
Technical Reference Manual, General
5.1.10. Analog outputs
The machine 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 machine terminal and from each other.
For technical data of the analog outputs, refer to Table 5.2.1-7 on page 82.
The parameters and events for the analog outputs are included in the event and
parameter lists on the CD-ROM Technical Descriptions of Functions (see “Related
documents” on page 10).
5.1.10.1. 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 #
.
5.1.10.2. Attributes of an analog output for machine terminal
configuration
The status (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 machine 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
REM543/ RTD1
Analog outputs RTD1_6_AO1
RTD1_6_AO2
RTD1_6_AO3
RTD1_6_AO4
Parameter Values Default
Output range 0 = 0...20 mA
1 = 4...20 mA 0...20 mA