Endress+Hauser RMA 422, Operating Instructions Manual

Page: 57 / 150

5.5 Alarm set points/fault monitoring
The following addresses are only available if the unit is fitted
with the Alarm relay option, each of the alarm set points is
allocated an alarm relay output with a changeover contact
(SPDT). The relay is switched to a de-active state on alarm or
fault condition. A yellow LED on the unit front panel indicates
the relay condition in accordance with the NAMUR NE44
recommendation:
LED on when the relay is active; LED off when the relay is
de-active. The LC display option will indicate the type of alarm
set point infringement, exceeding the set point or undercutting
it will be displayed.
The following description is valid for
the set points
LIM1
and
LIM2
Parameter Setting up selections
Default
settings Actual
setting
* Reference value
LREF1
/
LREF2
Selecting the signal source
that is to be monitored
Selection range:
IN1
: Process value ch. 1
IN2
: Process value ch. 2
MATH
: Process value maths.
IN1
* Operating mode
MODE1
/
MODE2
Selection of operation mode
of the alarm set points and
fault monitor
OFF
Set point and fault monitor
inactive
MIN
Minimum safety:
Event message on undercutting
the set point and in fault
condition.
MAX
Maximum safety:
Event message on exceedeing
the set point and in fault
condition.
TRD
Trend monitoring:
Event message on exceeding the
preset signal change per time
unit set point and in fault
condition.
ALARM
Event message only in fault
condition, no set point monitor.
MIN-
Minimum safety:
Event message on undercutting
the set point.
MAX-
Maximum safety:
Event message on exceedeing
the set point.
TRD-
Trend monitoring:
Event message on exceeding the
preset signal change per time
unit set point.
OFF
* Set point
SETP1
/
SETP2
Enter the set point. Value:
-19999 to 99999
0,0
LIM1
/
LIM2
Process transmitter
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