• Link Alarm

The Link alarm is used to control when the alarm is being monitored according to the state of a digital line. This could be for inhibiting the alarms when a door is open, or when a batch is not running.

NOTE:

You can use a digital lines faulty value or zero value to cause the alarm to be not monitored OR
a analogue lines value as long as the value is ZERO for not monitored and NON ZERO for monitored.

Example for use with digital switch:

A digital line is used to read in the state of the switch. It shows Healthy for ON, and Faulty for OFF. 
The Alarms on the temperature line, link alarm setting is set to the digital line.

Example.
Page 1 Line 1 Temp Input 1 Alarm, Link Alarm set to P1, Line 10 Door Switch
Page 1 Line 2 Temp Input 2 Alarm, Link Alarm set to P1, Line 10 Door Switch
Page 1 Line 2 Temp Input 3 Alarm, Link Alarm set to P1, Line 10 Door Switch

Page 1 Line 10, Door Switch.

When the Door Switch is Healthy (Value=1) the alarms on lines 1,2,3 will be monitored, When the door switch is Faulty (Value=0) the alarms on lines 1,2,3 will be not monitored and will show as YELLOW on the readings in the Data Screen.

Page 1, Line 10 could also be a Batch Run switch, Healthy = Run, Faulty = Stop. Then the alarms will be monitored when the batch is running, and not monitored when the batch stops.

When the alarm goes from faulty (inhibit) to healthy (monitor), the alarm delays start counting from that point. i.e if the delay of a line is set to 10 Minutes, and it is already out of limits, and the link line goes from faulty (inhibit) to healthy (monitor) to start the alarm monitoring, 10 minutes must elapse before the alarm will be notified.

Alarms that are currently counting (out of limits but some delay time is left) are ignored when the link alarm goes from healthy (monitor) to faulty (inhibit).
Alarms that have timed out and are waiting to be cleared from the Alarm Status window, will remain in the Alarm Status window when the link alarm goes from healthy (monitor) to faulty (inhibit). As soon as they are cleared, they will be removed from the Alarm Status screen. 

It is possible to have the high alarm on a line being controlled by the link alarm, and have the low alarm of the same line continually monitored.

In summary, a line with a link alarm setup, will not be monitored when it is drawn in YELLOW on the Data Screen.