Emerson Process Management ROSEMOUNT 5300 - Manual (Page 313)

Reference Manual
00809-0100-4530, Rev BA
July 2009
J-7
Rosemount 5300 Series
ALARM DETECTION A block alarm will be generated whenever the BLOCK_ERR has an error bit
set. The types of block error for the AI block are defined above.
Process Alarm detection is based on the OUT value. You can configure the
alarm limits of the following standard alarms:
• High (HI_LIM)
• High high (HI_HI_LIM)
• Low (LO_LIM)
• Low low (LO_LO_LIM)
In order to avoid alarm chattering when the variable is oscillating around the
alarm limit, an alarm hysteresis in percent of the PV span can be set using the
ALARM_HYS parameter. The priority of each alarm is set in the following
parameters:
• HI_PRI
• HI_HI_PRI
• LO_PRI
• LO_LO_PRI
Alarms are grouped into five levels of priority:
Table J-3. Alarm level priority
Priority Number Priority Description
0 The priority of an alarm condition changes to 0 after the condition that
caused the alarm is corrected.
1 An alarm condition with a priority of 1 is recognized by the system, but is
not reported to the operator.
2 An alarm condition with a priority of 2 is reported to the operator, but does
not require operator attention (such as diagnostics and system alerts).
3-7 Alarm conditions of priority 3 to 7 are advisory alarms of increasing priority.
8-15 Alarm conditions of priority 8 to 15 are critical alarms of increasing priority.