Emerson Rosemount 2240S, Справочное руководство, Страница: 88 / 194

78
Reference Manual
00809-0100-2240, Rev DA
Configuration/Operation
October 2017
Configuration/Operation
5.10.7 Process alarm
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
5.10.8 Alarm priority
Alarms are grouped into five levels of priority:
Table 5-11. 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.