|
Alarm Type Name |
Alarm Word |
Category |
Alarm Message |
|---|---|---|---|
|
Bypass Active |
BYPASSED |
PROCESS |
Maintenance Bypass or Force Active |
|
Change From Normal |
CFN |
PROCESS |
Change From Normal Value %P1 |
|
Change of State |
COS |
PROCESS |
Change of State |
|
Communication Error |
COMM |
INSTRUMENT |
Communication Error |
|
Deviation Alarm |
DEV |
PROCESS |
Deviation Alarm Target %P1 Actual %P2 |
|
Discrete Device |
FAILED |
PROCESS |
%P1 |
|
General I/O Failure |
IOF |
INSTRUMENT |
General I/O Failure |
|
High Alarm |
HIGH |
PROCESS |
High Alarm Value %P1 Limit %P2 |
|
High High Alarm |
HIHI |
PROCESS |
High High Alarm Value %P1 Limit %P2 |
|
Low Alarm |
LOW |
PROCESS |
Low Alarm Value %P1 Limit %P2 |
|
Low Low Alarm |
LOLO |
PROCESS |
Low Low Alarm Value %P1 Limit %P2 |
|
Open Circuit Detected |
OCD |
INSTRUMENT |
Open Circuit Detected |
|
Over Range |
OVER |
INSTRUMENT |
Over range Value %P1 |
|
Rate of Change |
RATE |
PROCESS |
Rate of Change Rate %P1 Limit %P2 |
|
Under Range |
UNDER |
INSTRUMENT |
Under range Value %P1 |
%P1 and %P2 represent the values of user-defined parameters. When configuring an alarm with Control Studio, check to see if the alarm message expects any user-defined parameters. If so, configure which parameter in that module should be read at the time of alarm detection to replace the %P1 (and %P2) in the alarm message. User-defined parameters typically capture the value that caused the alarm, the limit value that was in effect at the time the alarm was detected, and so on.
An alarm type determines the following (these definitions are the same for DeltaV SIS and non-SIS alarm types):
Alarm word - Appears in the operating environment when the alarm is active or unacknowledged. The alarm word can appear in the alarm banner, the Alarm List picture, and in the detail and faceplate displays for the standard DeltaV modules. When you create a custom display or Alarm List, you have the option to configure the alarm word or the alarm name to appear in the display.
Although logic solver hardware and device alarms do not have an alarm type, they do have one of the following alarm words: COMM, FAILED, MAINT, and ADVISE.
Alarm category - Appears in the Process History View for every alarm state change. You can use the category for sorting and filtering alarm data inside Process History View.
Alarm message - Appears in the standard Alarm List picture. The alarm message is defined as the Description field. The message is also logged in the Process History View.
For process alarms, the alarm message is a combination of text strings and variables that you supply in the following form:
text string %P1 text string %P2
where %P1 and %P2 represent parameter values. You define the default parameters in the Optional Alarm Message Parameters section of the System Alarm Type dialog through DeltaV Explorer.
For example, if you want the operator to see the following message for an alarm:
High Alarm 80 Alarm Limit 72
enter the following in the alarm message field:
High Alarm %P1 Alarm Limit %P2
and use the following parameters for %P1 and %P2:
Parameter 1: PV
Parameter 2: HI_LIM
For process alarms, the alarm message affects all the alarms associated with the alarm type unless you override both the message and message parameters for a specific alarm in Control Studio.
For Logic Solver hardware and device alarms, the alarm message is determined by the information available from the Logic Solver or device for the most recent condition change contributing to the alarm's activation.