Emerson Process Management 5300 manual Alarm Detection, Priority Number

Reference Manual

00809-0100-4530, Rev BA July 2009

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

1

2

3-7

8-15

The priority of an alarm condition changes to 0 after the condition that caused the alarm is corrected.

An alarm condition with a priority of 1 is recognized by the system, but is not reported to the operator.

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).

Alarm conditions of priority 3 to 7 are advisory alarms of increasing priority. Alarm conditions of priority 8 to 15 are critical alarms of increasing priority.

J-7