Setup MicroScan
Tag Setup: Alarm 2

The Alarm 2 category is used to setup the alarm 2 operation of an analogue tag. Alarm 2 has more Alarm Type options for use when the Tag is being used as a controller.  This category will only be displayed if Enable on the Alarm Setup Category is clicked.

Alarm Typ

The Alarm Type Controls how the alarm operates

ALARM TYPE

OPERATION

None

The alarm is not active

High

The alarm is active when the reading is above the set point

Low

The alarm is active when the reading is below the set point

_HH_ (Deviation from AL1)

AL2 is active when the reading is above AL1 set point + AL2 set point *NOTE

_LL_ (Deviation from AL1)

AL2 is active when the reading is above AL1 set point - AL2 set point *NOTE

_LH_ (Deviation from AL1)

AL2 is active when the reading is above AL1 set point + AL2 set point or when the reading is below AL1 set point - AL2 set point
*NOTE

*NOTE

The deviation alarms are designed to operate when the Tags AL1 is a controller output and AL2 is the deviation from ALe setpoint, should the input reading get out of range too much.

Differential

The Differential is used to determine when the alarm is cleared. ie for a high alarm, AL1 is turned on when the reading is above the set point, but is turned off when the reading drops below the set point - differential.

Delay

The Delay time (in seconds) determines how long the input must be outside of limits before it will be flagged as an alarm. If this value is set to 300 (5 Minutes) the reading must be above the set point continuously for 5 minutes before it will be considered an alarm.

Output

The Output is the device that will be turned on when the alarm occurs. The output is any tag, unlike in version 4, were a separate output tag data base was maintained. Click the ... button to enter or browse for a selected tag.

Link Alarm

The Link Alarm is used to allow a digital tag to operate as an enable on the alarm operation. If this is set to None, no inhibiting will take place. If this is set to a tag number, the alarm will only be monitored when the value of the linked tag is non zero (or 1 if it is a digital). The Link Alarm is normally set to an always scan digital tag, and when the tag changes from 0 to 1, the alarms tied to this tag will start to be monitored. Any number of tags can be tied to a Link Alarm tag input. Click the ... button to enter or browse for a selected tag.

Event Message

The Event Message is used when the alarm is displayed by Global Notify or printing the alarm.
Select a message from the combo box. Click Edit Messages to edit the event messages. 

See Also

Type and Address
Scaling
Alarm Setup
Alarm 1
Alarm 2
Totaliser
Retransmission
Digital Scaling
Psuedo Digital Scaling
Digital Alarm
Math Settings
Counter Scaling