Rev. 10/98 25 949-1239-3
The following diagram shows the action and reset functions for both
absolute and deviation alarms.
When “Alarm Power Interrupt” ALPi is programmed ON and “Alarm Reset”
is programmed for Hold, the alarm will automatically reset upon a power
failure and subsequent restoration if no alarm condition is present.
If “Alarm Inhibit” ALiH is selected ON, an alarm condition is suspended upon
power up until the process value passes through the alarm set point once.
Alarm inhibit can be restored as if a power up took place by pressing
together the INDEX and ENTER keys for 5 seconds.
WARNING: IF INHIBIT IS ON AND A POWER FAILURE OCCURS DURING A
HIGH
ALARM, RESTORATION OF POWER WILL NOT CAUSE THE ALARM TO
OCCUR
IF THE PROCESS VALUE DOES NOT FIRST DROP BELOW THE HIGH
ALARM
SETTING. DO NOT USE THE ALARM INHIBIT FEATURE IF A
HAZARD
IS CREATED BY THIS ACTION. BE SURE TO TEST ALL
COMBINATIONS
OF HIGH AND LOW ALARM INHIBIT ACTIONS BEFORE
PLACING
CONTROL INTO OPERATION.
The following Secure menu items apply only to the alarm.
AL Alarms: Select OFF, Lo, Hi, or HiLo.
OFF Alarms are turned OFF. No Alarm menu items appear
in the Secondary and Secure menus.
Lo Low Alarm Only. ALLo appears in the Secondary Menu.
Hi High Alarm Only. ALHi appears in the Secondary Menu.
HiLo High and Low Alarms. Both share the same Alarm Relay
output.
OFF ON
OFF ON
ON OFF
ON OFF
D
ALLo
ALHi
D
D
D
ALLo ALHi
SP1
SP1
SP1
High Alarm
Low Alarm
High and Low Alarm
DEVIATION ALARMS
OFF ON
OFF ON
ON OFF
ON OFF
D
ALLo
ALHi
D
D
D
ALLo ALHi
ABSOLUTE ALARMS
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