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Ascon Tecnologic - K Series - ENGINEERING MANUAL - Vr. 9.0
PAG. 10
]
AL1 Group - Alarm 1 parameters
[24] AL1t - Alarm 1 type
Available:
Always.
Range: •
When one or more outputs are programmed as
control output:
nonE = Alarm not used;
LoAb = Absolute low alarm;
HiAb = Absolute high alarm:
LHAb = Absolute band alarm:
SE.br = Sensor break;
LodE = Deviation low alarm (relative);
HidE = Deviation high alarm (relative);
LHdE = Relative band alarm.
•
When no output is programmed as control output:
nonE = Alarm not used;
LoAb = Absolute low alarm;
HiAb = Absolute high alarm;
LHAb = Absolute band alarm;
SE.br = Sensor break.
Notes: 1.
The relative and deviation alarms are “relative” to
the operative set point value.
LoAb
OUT
AL1
AL1
PV
HAL1
time
HiAb
off
off
off
OUT
AL1
AL1
PV
HAL1
time
off
off
off
ON
ON
ON
ON
LHAb
PV
AL1H
HAL1
time
off
off
off
LHde
OUT
AL1
AL1L
HAL1
PV
AL1H
SP
HAL1
time
OUT
AL1
-AL1L
HAL1
off
off
off
ON
ON
ON
ON
2.
The (SE.br) sensor break alarm will be ON when
the display shows
----
indication.
[25] Ab1 - Alarm 1 function
Available:
When [24] AL1t is different from
nonE
.
Range:
0... 15 with the following rule:
+1 =
Not active at Power ON;
+2 =
Latched alarm (manual reset);
+4 =
Acknowledgeable alarm;
+8 =
Relative alarm not active at set point change.
Example:
Setting Ab1 equal to 5 (1+4), alarm 1 will be “Not
active at Power ON” and “Acknowledgeable”.
Notes: 1.
The “Not active at Power ON” selection allows to
inhibit the alarm function at instrument Power ON
or when the instrument detects a transfer from:
- Manual mode (
oplo
) to auto mode;
- Stand-by mode to auto mode.
The alarm will be automatically enabled when the
measured value reaches, for the first time, the alarm
threshold plus or minus the hysteresis (in other
words, when the initial alarm condition disappears).
PWR ON
AL1
PV
time
off
off
Ab1 = +1
Ab1 = +0
off
off
ON
ON
ON
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 inputs or serial link).
Alarm reset
Alarm reset
AL1
PV
time
off
off
Ab1 = +2
Ab1 = +0
off
off
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
off
off
Ab1 = +4
Ab1 = +0
off
off
off
ON
ON
ON
4.
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 plus or minus hysteresis.
Sp2
Sp1
PV
time
Ab1 = +8
Ab1 = +0
ON
off
off
AL1
off
off
off
AL1
ON
ON
ON
ON
Note:
The instrument does not store in EEPROM the alarm
status. For this reason, all the alarm status will be lost
if a power down occurs.
[26] 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 [24] AL1t is different from
nonE
or
[24] AL1t is different from
SE.br
.
Range:
From - 1999 to [27] AL1H engineering units.
[27] AL1H - For High and low alarms, it is the high
limit of the AL1 threshold
- For band alarm, it is high alarm threshold
Available:
When [24] AL1t is different from
nonE
or
[24] AL1t is different from
SE.br
.
Range:
From [26] AL1L to 9999 engineering units.
[28] AL1- Alarm 1 threshold
Available:
When:
- [24] AL1t = LoAb, Absolute low alarm;
- [24] AL1t = HiAb, Absolute high alarm;
- [24] AL1t = LodE, Deviation low alarm (relative);
- [24] AL1t = LidE, Deviation high alarm (relative).
Range:
From [26] AL1L to [27] AL1H engineering units.