Emerson Process Management ROSEMOUNT 5300 Uživatelský manuál stáhnout pdf (Strana 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.

1 2 ... 308 309 310 311 312 313 314 315 316 317 318 ... 323 324

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Emerson Process Management ROSEMOUNT 5300 Uživatelský manuál Strana 313