Alarms view parameters

The
Alarms
 view includes these parameters:
Parameter
Description
Disable All Alarms
Disables all alarms for a channel.
Not configurable when in Run mode.
Process Alarming
Sets the maximum and minimum values for the process alarms using the settings in the individual channel view for
High Engineering
 and
Low Engineering
.
The alarm thresholds are in engineering units, but they can lie outside the Low Engineering and High Engineering. If the alarm thresholds lie outside the range of the input device, the alarm checking feature is turned off.
Refer to MSG service codes for additional information.
Process Alarming
 settings cannot be configured when in Run mode.
Requirements:
  • High High
    Limit
    must be greater than or equal to
    High
    Limit
    .
  • High Limit
    must be greater than
    Low
    Limit
    .
  • Low
    Limit
    must be greater than or equal to
    Low Low
    Limit
    .
  • High High Limit
    >=
    High Limit
    >
    Low Limit
    >=
    Low Low Limit
  • The distance between
    High
     and
    Low
    Limit
    must be more than twice the alarm
    Deadband
    .
Latch Process Alarms
Maintains the process alarm even after the condition ceases. The alarm only unlatches with an explicit message acknowledging the alarm.
Not configurable when in Run mode.
  • High High Limit
The level of input to a channel that causes the device to set the Ch
x
HHAlarm indicator bit. The alarm remains active until the input returns below this level, by more than the deadband. If
Latch Process Alarms
 is selected, the Ch
x
HHAlarm indicator bit remains set until explicitly cleared.
  • High Limit
The level of input to the channel that causes the device to set the Ch
x
HAlarm indicator bit. The alarm remains until the input returns below this level, by more than the deadband. If
Latch Process Alarms
 is selected, the Ch
x
HAlarm indicator remains set until explicitly cleared.
  • Low Limit
The level of input to the channel that causes the device to set the Ch
x
LAlarm indicator bit. The alarm remains until the input returns above this level, more than the deadband. If
Latch Process Alarms
 is selected, the Ch
x
LAlarm indicator bit remains set until explicitly cleared.
  • Low Low Limit
The level of input to the channel that causes the device to set the Ch
x
LLAlarm indicator bit. The alarm remains until the input returns above this level, more than the deadband. If
Latch Process Alarms
 is selected, the Ch
x
LLAlarm indicator bit remains set until explicitly cleared.
Deadband
The value where an alarm, once set, remains available as long as the input value is within the deadband range of the alarm trigger point. (This value in combination with the process alarms creates the range.)
This prevents the alarm from cycling on and off if the process value hovers near the alarm threshold.
Deadband
 must be less than half the distance between the
Low Limit
value and the
High Limit
value.
Deadband
is not configurable when in Run mode.
Refer to Example of Deadband configurations for additional information.
Enable Rate Alarm latching
Maintains the rate alarm even after the condition ceases. The alarm only unlatches with an explicit message acknowledging the alarm.
Not configurable when in Run mode.
Rate Alarm Limit
The maximum ramp rate value that triggers a Rate Alarm when the Input Signal rate of change exceeds the setpoint. This alarm is in engineering units/second.
This is useful for detecting rapid process changes.
Valid range is 0 ≤ Rate Alarm Limit ≤ 100,000,000.
If 0,
Rate Alarm Limit
 is disabled.
Not configurable when in Run mode.
Unlatch
Unlatches the adjacent alarm condition.
Not available when offline. Unlatching can be performed when in Run mode.
Unlatch All
Unlatches all alarms for the channel.
Not available when offline. Unlatching can be performed when in Run mode.
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