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3 8 Process Alarms
3 8 Process Alarms
There are at most two independent alarms available by adjusting OUT2. If
=AL2 is selected for OUT2, then OUT2 will perform alarm 2 function. Now
A2FN can't be selected with NONE, otherwise
will be displayed.
A process alarm sets an absolute trigger level ( or temperature ). When the
process ( could be PV1, PV 2 or PV1-PV2 ) exceeds that absolute trigger level
an alarm occurs. A process alarm is independent from set point.
Adjust A1FN ( Alarm 1 function ) in setup menu. One of 8 functions can be
selected for process alarm. These are : PV1.H, PV1.L, PV2.H, PV2.L, P1.2.H,
P1.2.L, D1.2.H, D1.2.L. When the PV1.H or PV1.L is selected the alarm
examines the PV1 value. When the PV2.H or PV2.L is selected the alarm
examines the PV2 value. When the P1.2.H or P1.2.L is selected the alarm
occurs if the PV1 or PV2 value exceed the trigger level. When the D1.2.H or
D1.2.L is selected the alarm occurs if the PV1-PV2 ( difference ) value exceeds
the trigger level. The trigger level is determined by A1SP ( Alarm 1 set point )
and A1HY ( Alarm 1 hysteresis value ) in User Menu for alarm 1. The hysteresis
value is introduced to avoid interference action of alarm in a noisy environment.
Normally A1HY can be set with a minimum ( 0.1 ) value.
A1DV and/or A2DV are hidden if alarm 1 and/or alarm 2 are set with process
alarm.
When a normal alarm is selected, the alarm output is de-energized in the
non-alarm condition and energized in an alarm condition.
If a latching alarm is selected, once the alarm output is energized, it will
remain unchanged even if the alarm condition is cleared. The latching alarms
are disabled when the power is shut off or if event input is applied with proper
selection of EIFN.
A holding alarm prevents an alarm from power up. The alarm is enabled
only when the process reaches the set point value ( may be SP1 or SP2,
See
event input ). Afterwards, the alarm performs same
function as normal alarm.
Er06
Normal Alarm : A1MD = NORM
Latching Alarm : A1MD = LTCH
Holding Alarm : A1MD = HOLD
Section 4-1
There are at most two independent alarms available by adjusting OUT2. If
=AL2 is selected for OUT2, then OUT2 will perform alarm 2 function. Now
A2FN can't be selected with NONE, otherwise
will be displayed.
A process alarm sets an absolute trigger level ( or temperature ). When the
process ( could be PV1, PV 2 or PV1-PV2 ) exceeds that absolute trigger level
an alarm occurs. A process alarm is independent from set point.
Adjust A1FN ( Alarm 1 function ) in setup menu. One of 8 functions can be
selected for process alarm. These are : PV1.H, PV1.L, PV2.H, PV2.L, P1.2.H,
P1.2.L, D1.2.H, D1.2.L. When the PV1.H or PV1.L is selected the alarm
examines the PV1 value. When the PV2.H or PV2.L is selected the alarm
examines the PV2 value. When the P1.2.H or P1.2.L is selected the alarm
occurs if the PV1 or PV2 value exceed the trigger level. When the D1.2.H or
D1.2.L is selected the alarm occurs if the PV1-PV2 ( difference ) value exceeds
the trigger level. The trigger level is determined by A1SP ( Alarm 1 set point )
and A1HY ( Alarm 1 hysteresis value ) in User Menu for alarm 1. The hysteresis
value is introduced to avoid interference action of alarm in a noisy environment.
Normally A1HY can be set with a minimum ( 0.1 ) value.
A1DV and/or A2DV are hidden if alarm 1 and/or alarm 2 are set with process
alarm.
When a normal alarm is selected, the alarm output is de-energized in the
non-alarm condition and energized in an alarm condition.
If a latching alarm is selected, once the alarm output is energized, it will
remain unchanged even if the alarm condition is cleared. The latching alarms
are disabled when the power is shut off or if event input is applied with proper
selection of EIFN.
A holding alarm prevents an alarm from power up. The alarm is enabled
only when the process reaches the set point value ( may be SP1 or SP2,
See
event input ). Afterwards, the alarm performs same
function as normal alarm.
Er06
Normal Alarm : A1MD = NORM
Latching Alarm : A1MD = LTCH
Holding Alarm : A1MD = HOLD
Section 4-1
Process Alarm 1
Process Alarm 1
Setup : A1FN, A1MD
Setup : A1FN, A1MD
Adjust : A1SP, A1HY
Adjust : A1SP, A1HY
Process Alarm 2
Process Alarm 2
Setup : OUT2, A2FN, A2MD
Setup : OUT2, A2FN, A2MD
Adjust : A2SP, A2HY
Adjust : A2SP, A2HY
Trigger level = A1SP
1/2 A1HY
A
Trigger level = A1SP
1/2 A1HY
A
Trigger level = A2SP
1/2 A2HY
A
Trigger level = A2SP
1/2 A2HY
A
Reset Latching alarm
Reset Latching alarm
1. Power off
1. Power off
2. Apply Event input in accordance
2. Apply Event input in accordance
with proper selection of EIFN
with proper selection of EIFN
205
195
205
195
205
205
205
195
195
195
ON
OFF
Figure 3.5
Normal Process Alarm
Figure 3.5
Normal Process Alarm
A1SP = 200
A1HY = 10.0
A1MD = NORM
A1FN = PV1.H
A1SP = 200
A1HY = 10.0
A1MD = NORM
A1FN = PV1.H
Process proceeds
Process proceeds
Examples:
Latching / Holding Alarm : A1MD = LT.HO
A latching / holding alarm performs both holding and latching function.
Latching / Holding Alarm : A1MD = LT.HO
A latching / holding alarm performs both holding and latching function.
8 Types of Process Alarms :
PV1.H, PV1.L, PV2.H, PV2.L, P1.2.H,
P1.2.L, D1.2.H, D1.2.L
8 Types of Process Alarms :
PV1.H, PV1.L, PV2.H, PV2.L, P1.2.H,
P1.2.L, D1.2.H, D1.2.L
48
UM93001C
Error Code
Error Code