Ascon Tecnologic - KX6 - ENGINEERING MANUAL - PAG. 10
2. A “Latched alarm” (manual reset) is an alarm
that remains active even if the conditions that
generated the alarm no longer persist. Alarm
reset can be done only by an external
command
(
button, digital input or serial link).
Alarm reset Alarm reset
AL1
PV
time
offoff
Ab1 = +2
Ab1 = +0
offoff
ON
ON
3. An “Acknowledgeable” alarm is an alarm that can
be reset even if the conditions that generated the
alarm are still present. Alarm acknowledge can be
done only by an external command (
button,
digital inputs or serial link).
Alarm ACK Alarm ACK
AL1
PV
time
offoff
Ab1 = +4
Ab1 = +0
offoff off
ON
ON ON
A “relative alarm not active at set point change” is
an alarm that masks the alarm condition after a
set point change until process variable reaches the
alarm threshold ± hysteresis.
Sp2
Sp1
PV
time
Ab1 = +8
Ab1 = +0
ON
offoff
AL1
offoffoff
AL1
ON ON ON
ON
4. The instrument does not store in EEPROM the
alarm status. For this reason, the alarm status
will be lost if a power down occurs.
[21] AL1L - For High and low alarms, it is the low
limit of the AL1 threshold
-
For band alarm, it is low alarm threshold
Available: When [19] AL1t is different from nonE or
[19] AL1t is different from SE.br.
Range: From -1999 to [22] AL1H engineering units.
[22] AL1H - For High and low alarms, it is the high
limit of the AL1 threshold
- For band alarm, it is the high alarm
threshold
Available: When [19] AL1t is different from nonE or
[19] AL1t is different from SE.br.
Range: From [21] AL1L to 9999 engineering units.
[23] AL1- Alarm 1 threshold
Available: When:
[19] AL1t = LoAb - Absolute low alarm;
[19] AL1t = HiAb - Absolute high alarm;
[19] AL1t = LodE - Deviation low alarm (relative);
[19] AL1t = LidE - Deviation high alarm (relative).
Range: From [21] AL1L to [22] AL1H engineering units.
[24] HAL1 - Alarm 1 hysteresis
Available: When [19] AL1t is different from nonE or
[19] AL1t is different from SE.br.
Range: 1... 9999 engineering units.
Notes: 1. The hysteresis value is the difference between
the Alarm threshold value and the point the Alarm
automatically resets.
2. When the alarm threshold plus or minus the
hysteresis is out of input range, the instrument will
not be able to reset the alarm.
Example: Input range 0... 1000 (mBar).
– Set point equal to 900 (mBar);
– Deviation low alarm equal to 50 (mBar);
– Hysteresis equal to 160 (mBar) the theoretical reset point is
900 - 50 + 160 = 1010 (mBar) but this value is out of range.
The reset can be made only by turning the instrument
OFF, removing the condition that generate the alarm and
then turn the instrument ON again.
– All band alarms use the same hysteresis value for both
thresholds;
– When the hysteresis of a band alarm is bigger than the
programmed band, the instrument will not be able to reset
the alarm.
Example: Input range 0... 500 (°C).
– Set point equal to 250 (°C);
– Relative band alarm;
– Low threshold equal to 10 (°C);
– High threshold equal to 10 (°C);
– Hysteresis equal to 25 (°C).
[25] AL1d - Alarm 1 delay
Available: When [19] AL1t is different from nonE.
Range: 0 oFF
1... 9999 seconds.
Note: The alarm goes ON only when the alarm condition
persists for a time longer than [25] AL1d time but the
reset is immediate.
[26] AL1o - Alarm 1 enabling during Stand-by mode
and out of range indications
Available: When [19] AL1t is different from nonE.
Range: 0 Never;
1 During stand by;
2 During overrange and underrange;
3
During overrange, underrange and stand-by.
]AL2 Group - Alarm 2 parameters
[27] AL2t - Alarm 2 type
Available: Aways.
Range: • When at least one output is programmed as con-
trol output:
nonE Alarm not used;
LoAb Absolute low alarm;
HiAb Absolute high alarm;
LHAo Absolute band alarm with alarm indication
out of the band;
LHAi Absolute band alarm with alarm indication
inside the band;
SE.br Sensor break;
LodE Deviation low alarm (relative);
HidE Deviation high alarm (relative);
LHdo Relative band alarm with alarm indication
out of the band;
LHdi Relative band alarm with alarm indication
inside the band.
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